Turkish possession often looks more complicated than its English equivalent because the language can mark the relationship between the possessor and the possessed noun in more than one place. A phrase such as benim kitabım [my book] contains information about possession both in benim and in the ending attached to kitap, while annemin evi [my mother’s house] and Türkiye’nin tarihi [Turkey’s history] show the same relationship between two nouns.

In my experience teaching Turkish, this is where many learners become confused. They may understand each possessive ending individually but struggle once several endings appear in the same phrase. The problem is usually not that the suffixes themselves are exceptionally difficult. It is that learners are still trying to match each Turkish form with a separate English word.

I find it much more helpful to teach possession as a system. Instead of asking, “Which Turkish word means my?” or “Which suffix means of?”, I ask students to identify two things: Who is the possessor, and what is being possessed or associated with that person or thing?

Once you begin seeing those relationships, structures that initially seem crowded with suffixes become much easier to understand. In this article, I’ll show you how Turkish possessive suffixes work, how they combine with pronouns and the genitive case, why Turkish sometimes marks both sides of a possessive relationship, and how to recognize the recurring patterns behind expressions such as benim kitabım, annemin evi, and Türkiye’nin tarihi.

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How Does Possession Work in Turkish?

Turkish expresses possession primarily through grammatical endings attached to words. The possessed noun normally carries a possessive suffix, while an explicitly stated possessor may also take a genitive ending. This means that possession is often marked through the relationship between two forms rather than through a single separate word.

Compare English my book with Turkish benim kitabım. In English, the determiner my carries the possessive meaning. In Turkish, benim identifies the possessor, but kitabım also tells us that the book belongs to the speaker.

The same principle applies when the possessor is a noun:

annemin evi
[my mother’s house]

Here, annemin identifies the possessor, while evi marks the house as the thing associated with that possessor.

This is why I encourage students not to translate possession word by word. Turkish is not simply replacing English my, your, ’s, or of with equivalent pieces. It is building a grammatical relationship between the possessor and the possessed noun.

That relationship can express literal ownership, but it can also express family ties, association, membership, origin, or other kinds of connection. The structure becomes much easier to follow when you look at the phrase as a whole.

How Turkish Possessive Pronouns and Suffixes Work Together

The Turkish possessive pronouns are:

benim [my]
senin [your]
onun [his/her/its]
bizim [our]
sizin [your, plural or formal]
onların [their]

These forms identify the possessor. The noun that follows normally receives its own possessive suffix.

For example:

benim kitabım [my book]
senin çantan [your bag]
onun evi [his/her house]
bizim odamız [our room]

Notice that Turkish onun can mean his, her, or its. Turkish does not make the same grammatical gender distinction that English makes here, so the surrounding context tells you whose possession is being discussed.

I usually ask students to read these phrases in two parts. First, identify the possessor. Then look at the noun ending and ask whose object, place, or relationship it is marking.

That is much more useful than memorizing benim = my, senin = your, and stopping there. Those pronouns are only one side of the structure.

How Do Turkish Possessive Suffixes Work?

Turkish possessive suffixes change according to the person of the possessor. There are forms corresponding to my, your, his/her/its, our, your plural or formal, and their.

Rather than memorizing these as isolated endings, I prefer to show students how the same pattern appears with familiar nouns.

With ev [house], for example, you can produce forms such as:

evim [my house]
evin [your house]
evi [his/her house]
evimiz [our house]
eviniz [your house, plural/formal]
evleri [their house/their houses, depending on context]

The same grammatical relationships appear with other nouns, but the precise shape of the suffix changes because Turkish follows vowel harmony.

With araba [car], for instance, you get forms such as arabam [my car] and araban [your car], while okul [school] produces okulum [my school].

The noun itself can also change slightly when a suffix is added. Kitap [book], for example, becomes kitabım [my book]. These sound changes are regular features of Turkish pronunciation and spelling rather than exceptions learners need to treat as unrelated vocabulary.

When I teach this, I want students to recognize the function first: “This ending tells me who this noun is connected to.” Once that idea is clear, vowel harmony and consonant changes become easier to manage because the learner already understands what the suffix is doing.

Why Does Benim Kitabım Have Two Signs of Possession?

One of the most common questions students ask me is why Turkish needs both benim and the possessive ending in kitabım. If benim already tells us that the book is mine, why mark the noun too?

The answer is that Turkish can mark both sides of the possessive relationship.

In benim kitabım:

benim identifies the possessor: me
kitabım identifies the possessed noun as belonging to me

The same structure appears in:

senin araban [your car]

Here, senin identifies you as the possessor, while -n in araban marks the car as yours.

And in:

onun adı [his/her name]

onun identifies the third-person possessor, while the ending in adı marks the name as belonging or relating to that person.

English-speaking learners sometimes find this repetitive because English generally uses only one visible possessive marker in phrases such as my book. But Turkish is not repeating the same English word twice. The pronoun and noun ending have different grammatical roles within the same relationship.

This is why I encourage students to stop thinking of benim as a complete equivalent of my. It identifies the possessor, but Turkish still marks the possessed noun according to that relationship.

How Does the Turkish Genitive Case Work?

The Turkish genitive case marks an explicit possessor. When the possessor is a noun rather than a personal pronoun, it generally takes a genitive ending, while the possessed noun takes a possessive suffix.

For example:

annemin evi
[my mother’s house]

The word annemin identifies my mother as the possessor, while evi marks the house as the noun connected to her.

The same pattern appears in:

Türkiye’nin tarihi
[Turkey’s history]

Here, Türkiye’nin is the possessor and tarihi is the possessed or associated noun.

This is one of the most important patterns learners need to recognize because the two endings work together. I do not recommend learning the genitive ending and the possessive ending as two unrelated grammar rules. It is much more useful to see them as the two sides of a relationship.

This also explains why translating English of directly into Turkish can cause problems. Turkish does not simply have one suffix that replaces of in every context. Instead, it marks how the two nouns relate to each other.

So rather than thinking:

the history of Turkey = of + Turkey + history

I encourage students to think:

Türkiye’nin tarihi = Turkey marked as the possessor + history marked as the associated noun

That way of thinking becomes particularly useful as phrases become longer and more complex.

Turkish Genitive + Possessive Suffix: The Pattern Learners Need to Recognize

A useful way to see the structure is to break the words into their grammatical parts:

annem-in ev-i
[my mother’s house]

Türkiye-nin tarih-i
[Turkey’s history]

Ayşe’nin telefon-u
[Ayşe’s phone]

In each case, the first noun identifies the possessor and takes the genitive ending. The second noun identifies the thing that belongs to, comes from, or is associated with that possessor and takes a possessive ending.

I use this kind of breakdown with students not because I want them to analyze every word mechanically in conversation, but because it makes the relationship visible. Once they can see the pattern clearly, they start recognizing it automatically in longer phrases.

That is the point where Turkish possession begins to feel less like a collection of suffixes and more like a system.

Can You Leave Out Benim, Senin, and Other Possessive Pronouns?

Yes. In Turkish, possessive pronouns such as benim [my], senin [your], and onun [his/her/its] are often omitted because the possessive suffix on the noun already tells the listener who the possessor is.

For example:

Kitabım nerede?
[Where is my book?]

The ending -ım in kitabım already identifies the book as mine, so there is usually no need to add benim.

The same principle applies to other persons:

Araban nerede?
[Where is your car?]

Evimiz çok küçük.
[Our house is very small.]

Telefonunuz burada.
[Your phone is here.]

For English-speaking learners, this can take some getting used to because English normally requires a possessive determiner such as my, your, or our. As a result, students sometimes produce benim kitabım, senin araban, and bizim evimiz every time, even when the pronoun adds no new information.

I encourage learners to trust the suffix. If the possessive ending already makes the relationship clear, Turkish does not need to repeat the possessor unnecessarily.

When Turkish Speakers Keep the Possessive Pronoun

The possessive pronoun becomes useful when the speaker wants to add emphasis, contrast, or clarification.

Compare:

Çantam pahalı.
[My bag is expensive.]

and:

Benim çantam pahalı.
[My bag is expensive.]

The basic information is the same, but benim can place extra emphasis on my. This is particularly useful if several people’s belongings are being compared.

For example:

Benim çantam pahalı, onun çantası ucuz.
[My bag is expensive; his/her bag is cheap.]

Here, including the possessors helps create a clear contrast between the two bags.

This is why I prefer teaching pronoun omission as a communicative choice rather than telling students simply that Turkish “drops pronouns.” The possessive pronoun is available when you need to make the possessor explicit, but the suffix often carries enough information on its own.

Turkish Possession Does Not Always Mean Literal Ownership

Turkish possessive structures express relationships and associations, not only physical ownership. A person can possess a book or a phone, but the same grammatical structure can connect a country with its culture, a university with its students, or an organization with its members.

Consider:

Türkiye’nin kültürü
[Turkey’s culture]

Turkey does not literally “own” its culture in the same way that someone owns a phone. The structure expresses an association between Türkiye and kültür.

The same applies to:

üniversitenin öğrencileri
[the university’s students]

The students are connected to the university through membership or affiliation rather than ownership.

Other relationships work in a similar way. We can talk about a person’s family, a company’s employees, a city’s history, or a school’s teachers using structures that grammatically resemble possession.

This broader meaning is important because English learners sometimes associate the word possession too strongly with objects that belong to someone. When I teach this topic, I deliberately include examples involving family, education, places, work, and culture so that students learn to recognize the underlying relationship rather than look for literal ownership.

Turkish Possession vs. Turkish Noun Compounds

Not every Turkish structure that resembles possession describes a specific possessor. Turkish noun compounds can use a similar-looking ending on the second noun while expressing a type, category, or general relationship rather than ownership by a particular person or thing.

Compare:

Ayşe’nin telefonu
[Ayşe’s phone]

and:

telefon ekranı
[phone screen]

In Ayşe’nin telefonu, Ayşe’nin is a specific possessor. It therefore takes the genitive ending, and telefonu carries the possessive suffix.

In telefon ekranı, however, telefon does not refer to one particular phone that owns a screen. The phrase tells us what kind of screen we mean: a phone screen. The first noun therefore appears without the genitive ending.

Another useful comparison is:

okulun kapısı
[the school’s door/gate]

versus:

okul kapısı
[school door/gate]

The first refers to the door of a particular school. The second can describe a type or category of door associated with schools more generally.

Learners do not need to master every category of Turkish noun compound immediately. What matters at this stage is recognizing that a possessive-looking ending on the second noun does not automatically mean literal ownership. Again, the relationship between the nouns is what determines the structure.

How Vowel Harmony Changes Turkish Possessive Suffixes

Turkish possessive suffixes change their vowels to match the sound pattern of the noun they attach to. This is part of vowel harmony, one of the most important organizing principles in Turkish grammar.

Consider these three forms:

ev → evim
[house → my house]

araba → arabam
[car → my car]

okul → okulum
[school → my school]

All three endings express exactly the same relationship: my. What changes is the vowel used in the suffix.

Students sometimes see -im, -ım, -um, and -üm and assume that they need to memorize four completely different endings. I prefer to explain them as different versions of the same suffix. The vowel adapts to the last vowel of the noun so that the word follows Turkish sound patterns.

This becomes much easier with repeated exposure. After hearing and using forms such as evim, okulum, and gözüm [my eye] regularly, learners usually stop calculating the vowel consciously and begin to develop an instinct for which form sounds natural.

That is why I combine vowel harmony practice with meaningful vocabulary rather than teaching the endings as an isolated list. The grammatical function remains stable even when the sound changes.

Why Kitap Becomes Kitabım

Adding a possessive suffix can sometimes change the final consonant of a Turkish noun. One common example is:

kitap → kitabım
[book → my book]

The final p becomes b before the vowel-initial possessive suffix.

Similar changes can appear in other common words:

yurt → yurdum
[dormitory/homeland → my dormitory/homeland]

araç → aracım
[vehicle → my vehicle]

These changes are part of a broader Turkish sound pattern in which certain final consonants may soften when a vowel follows them.

I do not expect beginners to memorize every possible consonant change before they start speaking. I would rather have them learn frequent words in complete forms such as kitabım and gradually notice the pattern. Once they understand that the possessive suffix is triggering a predictable sound adjustment, forms that initially look irregular become much less intimidating.

What Happens When a Turkish Noun Ends in a Vowel?

When a noun already ends in a vowel, some possessive endings become shorter because Turkish does not need to insert the extra vowel that appears after a consonant.

Compare:

ev → evim
[house → my house]

with:

araba → arabam
[car → my car]

After the consonant in ev, the first-person suffix includes a vowel: -im. Because araba already ends in a vowel, only -m is added.

The same happens in the second person:

evin
[your house]

araban
[your car]

Third-person possession introduces an additional feature. When the noun ends in a vowel, Turkish uses -s- before the possessive vowel:

araba → arabası
[car → his/her car]

pasta → pastası
[cake → his/her cake]

You can think of the s as helping the noun and suffix connect smoothly.

These patterns may look like several separate rules when students first encounter them. In practice, however, they become predictable once you compare consonant-final and vowel-final nouns side by side.

Turkish Possessive Suffixes: Quick Reference Table

Once you understand the relationship between the possessor and the possessed noun, a compact overview can help you see how the endings fit together. The chart below uses ev [house], which ends in a consonant, and araba [car], which ends in a vowel.

The vowels shown in parentheses change according to vowel harmony. I recommend using this as a reference rather than trying to memorize every form at once.

Person / Possessor After a Consonant After a Vowel Examples
Ben [my] -(ı/i/u/ü)m -m evim [my house] / arabam [my car]
Sen [your, singular] -(ı/i/u/ü)n -n evin [your house] / araban [your car]
O [his/her/its] -(ı/i/u/ü) -(s)ı/i/u/ü evi [his/her house] / arabası [his/her car]
Biz [our] -(ı/i/u/ü)mız/miz/muz/müz -mız/miz/muz/müz evimiz [our house] / arabamız [our car]
Siz [your, plural/formal] -(ı/i/u/ü)nız/niz/nuz/nüz -nız/niz/nuz/nüz eviniz [your house] / arabanız [your car]
Onlar [their] -ları/-leri -ları/-leri evleri [their house/house(s)] / arabaları [their car/car(s)]

The most useful thing to notice is that these are recurring patterns, not unrelated endings. Once you know who the possessor is, whether the noun ends in a vowel or consonant, and which vowel harmony pattern it follows, you can usually predict the form you need.

A Sample Lesson for Teaching Turkish Possession

When I teach Turkish possession, I prefer to begin with a relationship learners can see rather than with a table of suffixes. If students can identify who an object belongs to and describe that relationship in Turkish, the grammar already has a communicative purpose. From there, I can gradually introduce the genitive, possessive suffixes, pronoun omission, and vowel harmony without asking them to process every rule at once.

A simple activity with everyday objects or pictures works particularly well. I might use a phone, laptop, book, and bag, either as real objects in the room or as images assigned to different people.

  1. Begin with one clear question.
    I show the learner a phone associated with someone named Ayşe and ask:

Bu kimin telefonu?
[Whose phone is this?]

Then we build the answer together:

Ayşe’nin telefonu.
[Ayşe’s phone.]

At this stage, I draw attention to the relationship rather than asking the student to memorize terminology. Ayşe’nin tells us whose phone we are talking about, while telefonu marks the object connected to Ayşe.

  1. Change the possessor while keeping the object the same.
    Once the first phrase is comfortable, I change only one element:

Mehmet’in telefonu.
[Mehmet’s phone.]

Annemin telefonu.
[My mother’s phone.]

Arkadaşımın telefonu.
[My friend’s phone.]

Keeping telefon constant helps the learner concentrate on how the possessor changes. It also makes the recurring genitive + possessive relationship much easier to notice.

  1. Change the object and recycle the same structure.
    Next, I introduce the other objects:

Ayşe’nin kitabı.
[Ayşe’s book.]

Mehmet’in çantası.
[Mehmet’s bag.]

Annemin bilgisayarı.
[My mother’s computer.]

Now the learner has to adjust the second noun as well. This naturally introduces vowel harmony and differences between consonant-final and vowel-final nouns without turning the activity into an abstract suffix drill.

  1. Move from noun possessors to personal possession.
    Once students understand the relationship between two nouns, I introduce forms such as:

benim telefonum
[my phone]

senin kitabın
[your book]

onun çantası
[his/her bag]

At this point, I ask the learner to identify the two signals of possession: the possessor and the ending on the noun. This reinforces the idea that Turkish is marking a relationship rather than simply replacing English my or your with one word.

  1. Remove information Turkish no longer needs.
    The next step is especially important for natural conversation. I move from:

Benim telefonum nerede?
[Where is my phone?]

to:

Telefonum nerede?
[Where is my phone?]

We discuss why benim is unnecessary when -um already tells the listener that the phone belongs to the speaker. I then repeat the exercise with other people and objects so students learn to omit possessive pronouns when they are not needed.

  1. Finish with short spoken descriptions.
    Finally, I ask students to use several possessive structures together. They might describe a picture of a family, talk about objects on their desk, or explain who owns different items:

Bu benim çantam. Kitabım çantamın içinde. Bu da kardeşimin telefonu.
[This is my bag. My book is inside my bag. And this is my sibling’s phone.]

By the end of one activity, the learner has practiced possessive suffixes, the Turkish genitive, vowel harmony, pronoun omission, and complete spoken sentences. More importantly, they have used all of those forms to communicate meaningful relationships rather than simply filling gaps in a grammar exercise.

Common Mistakes With Turkish Possession

The mistakes learners make with Turkish possession usually come from understanding one part of the structure but overlooking the relationship as a whole. A student may remember the genitive ending but forget the possessive suffix, learn one version of a suffix and apply it everywhere, or translate an English structure too literally.

One of the most common errors I see is marking the possessor but leaving the second noun unchanged:

Annemin ev ❌
Annemin evi ✅
[My mother’s house.]

The learner has correctly marked annem [my mother] as the possessor, but Turkish also requires ev [house] to carry the appropriate possessive ending. I encourage students to check both sides of the relationship whenever they build this kind of phrase.

Another frequent problem is overusing possessive pronouns. English speakers are accustomed to saying my book, your car, and his phone, so they may repeatedly produce benim kitabım, senin araban, and onun telefonu even when the context already makes the possessor obvious. These forms are grammatically possible, but natural Turkish often needs only kitabım, araban, or telefonu unless the speaker wants emphasis or contrast.

Students can also make the mistake of learning -im as though it were a fixed suffix meaning my. They then try to attach exactly that form to every noun. But vowel harmony means that the same grammatical function appears differently in words such as:

evim [my house]
okulum [my school]
arabam [my car]
gözüm [my eye]

The goal is to recognize one possessive pattern expressed through several harmonized forms, not to memorize each form as an unrelated suffix.

Direct translation from English creates another difficulty, especially with ‘s and of. Learners sometimes look for one Turkish ending that corresponds neatly to English of. Instead, Turkish normally expresses the relationship through the combination of the genitive on the possessor and a possessive ending on the associated noun:

Türkiye’nin tarihi
[Turkey’s history / the history of Turkey]

Noun compounds can create additional confusion because they may resemble possessive phrases. Compare okulun kapısı [the school’s door] with okul kapısı [school door]. In the first phrase, a particular school is the possessor. In the second, the nouns form a more general compound describing a type of door. Looking only at the English translation can hide this distinction.

Finally, learners sometimes understand the grammatical structure but produce the wrong sound changes. They may choose the wrong vowel-harmony form or overlook a consonant change such as:

kitap → kitabım
[book → my book]

I find that repeated use is more effective than correcting these forms only through rules. A learner might begin with:

Arabam.
[My car.]

Then expand it:

Arabam yeni.
[My car is new.]

And eventually produce something more complex:

Arabam yeni ama eski arabam daha rahattı.
[My car is new, but my old car was more comfortable.]

Each new sentence recycles the same possessive pattern while giving the learner something meaningful to say. With enough repetition, arabam stops feeling like araba + a suffix I need to calculate and begins to feel like a word the learner can produce automatically.

How Teachers Can Make Turkish Possessive Suffixes Easier to Understand

I have found that Turkish possessive suffixes become much easier when students encounter them as part of complete relationships rather than as an isolated chart to memorize. A suffix table can be useful as a reference, but learners ultimately need to connect those endings with people, objects, places, and situations that mean something to them.

That is why I recycle the same structure across different topics. When we talk about family, students might describe annemin evi [my mother’s house] or kardeşimin odası [my sibling’s room]. When we discuss work, we can introduce expressions involving a company’s employees or a colleague’s responsibilities. A lesson about travel might involve a city’s history, a hotel’s location, or someone’s passport. The vocabulary changes, but the grammatical relationship remains familiar.

I also repeatedly ask two simple questions: Who is the possessor or associated person or thing? What is being possessed or associated with them? Once students can answer those questions, they are much less likely to treat the genitive and possessive endings as unrelated grammar rules.

Personalizing the examples makes a particularly noticeable difference. Describing an imaginary person’s family can be useful, but talking about your own parents, apartment, coworkers, belongings, or travel plans gives the structure a reason to stay in your memory. It also allows me to notice exactly where an individual student is having difficulty and adjust the lesson accordingly.

That combination of useful explanations and personalized practice is one of the advantages learners often appreciate in one-to-one lessons. Ruth Gorman, for example, described her ongoing experience learning Turkish in Houston with her teacher this way:

“Aynur is a delight. She makes the lessons fun and successful. We couldn’t be happier with our decision to learn Turkish with Language Trainers!”

Working individually with a native Turkish teacher means the lesson can respond to the mistakes you are actually making. If vowel harmony is causing problems, we can spend more time comparing forms until the pattern becomes familiar. If you understand the endings but overuse benim and senin, we can focus on conversational situations where Turkish naturally omits them. And if noun compounds are causing confusion, we can contrast them with true possessive relationships using vocabulary that is relevant to your own life.

Personalized, one-to-one Turkish lessons also give you something a suffix chart cannot: immediate feedback while you are speaking. Instead of simply knowing the rule, you have repeated opportunities to use it, adjust it, and eventually produce the structure without consciously thinking through every ending.

Whether you want to feel more confident speaking Turkish in everyday situations, understand complex grammar more naturally, or prepare for work, travel, or family conversations, personalized lessons can help you focus on the areas that matter most to you. Contact Language Trainers now and tell us about your goals so we can match you with a native Turkish teacher and build a one-to-one course around your needs.

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FAQs About Turkish Possessive Suffixes and the Genitive

1.    What Are the Turkish Possessive Suffixes?

Turkish has possessive suffixes corresponding to the six grammatical persons: my, your, his/her/its, our, your plural or formal, and their. With a consonant-final noun such as ev [house], these produce forms such as evim [my house], evin [your house], evi [his/her house], evimiz [our house], eviniz [your house], and evleri [their house/house(s)]. The vowels in these suffixes change according to vowel harmony, and vowel-final nouns use slightly different forms.

2.    What Is the Turkish Genitive Case Used For?

The Turkish genitive case typically marks an explicitly stated possessor in a relationship between two nouns. In annemin evi [my mother’s house], annemin carries the genitive ending, while evi carries a possessive ending. The two forms work together, so it is more useful to learn the complete genitive + possessive pattern than to think of the genitive as a direct equivalent of English ‘s or of.

3.    Why Does Turkish Say Benim Kitabım Instead of Just Benim Kitap?

Turkish marks both sides of the possessive relationship. In benim kitabım [my book], benim identifies the speaker as the possessor, while the ending in kitabım marks the book as belonging to that possessor. Benim kitap therefore lacks the possessive marking Turkish normally requires on the noun.

4.    Can You Leave Out Benim and Senin in Turkish?

Yes. Turkish often omits benim [my], senin [your], and other possessive pronouns because the ending on the noun already identifies the possessor. Kitabım nerede? means [Where is my book?] without benim because -ım already marks the book as mine. Speakers usually keep the pronoun when they want to emphasize or contrast the possessor.

5.    How Does Vowel Harmony Affect Turkish Possessive Suffixes?

Vowel harmony changes the vowel inside a possessive suffix so that it matches the sound pattern of the noun. That is why my appears in forms such as evim [my house], okulum [my school], arabam [my car], and gözüm [my eye]. These are not four unrelated possessive endings; they are harmonized forms of the same grammatical pattern.

6.    Why Is There an s in Forms Like Arabası?

The s in arabası [his/her car] acts as a linking consonant between a vowel-final noun and the third-person possessive suffix. Compare ev → evi [house → his/her house] with araba → arabası [car → his/her car]. Because araba already ends in a vowel, -s- helps connect the noun smoothly to the possessive ending.

7.    Are Turkish Noun Compounds the Same as Possessive Phrases?

No. They can look similar because the second noun in a Turkish noun compound may carry an ending that resembles a possessive suffix, but the relationship is different. Ayşe’nin telefonu [Ayşe’s phone] identifies Ayşe as a specific possessor and marks her with the genitive. Telefon ekranı [phone screen], by contrast, describes a general type of screen, so telefon does not receive the genitive ending. Recognizing whether the first noun is a specific possessor or part of a general compound helps you choose the correct structure.