Kuzenim yarın kütüphanede ders çalışacak.

The base noun is kuzen = cousin. Turkish adds a possessive suffix directly to the noun:

• kuzen = cousin
• kuzenim = my cousin

Here, -im is the first-person singular possessive suffix. Because of vowel harmony, the suffix can appear as -ım, -im, -um, -üm. With kuzen, the correct form is -im.

Kuzenim is enough by itself. The -im already means my.

So:

• kuzenim = my cousin
• benim kuzenim = my cousin, with extra emphasis on my

Turkish often leaves out words like benim when the suffix already shows the meaning clearly.

Yarın means tomorrow. It is a time word, and in Turkish, time expressions often appear near the beginning of the sentence.

A very common pattern is:

subject + time + place + verb

So in this sentence:

• Kuzenim = subject
• yarın = time
• kütüphanede = place
• ders çalışacak = verb phrase

Kütüphane means library. The ending -de is the locative suffix, which means in, at, on depending on context.

So:

• kütüphane = library
• kütüphanede = in/at the library

In this sentence, English naturally uses at the library or in the library.

The locative suffix changes form because of vowel harmony and consonant harmony.

The locative has four common forms:

• -da
• -de
• -ta
• -te

Why -de here?

1. Vowel harmony: the last vowel in kütüphane is e, so we need an e-type suffix: -de or -te
2. Consonant harmony: kütüphane ends in a vowel, so we use d, not t

That gives kütüphanede.

Turkish does not have a definite article like English the.

So kütüphane can mean library, a library, or the library, depending on context. The suffix -de only adds the idea of location.

That means kütüphanede can be understood as:

• in a library
• in the library
• at the library

In a sentence like this, English usually translates it as at the library because it sounds most natural.

Because ders çalışmak is a common Turkish expression meaning to study in the sense of studying lessons/schoolwork.

Literally:

• ders = lesson, class, study material
• çalışmak = to work, to study

Together, ders çalışmak means to study.

This is very common in Turkish: a noun plus a verb can act like a single idea.

It is the verb çalışmak in the future tense.

Breakdown:

• çalış- = verb stem
• -acak = future tense marker

So çalışacak means he/she/it will study or is going to study.

Because the subject is kuzenim, the full meaning is my cousin will study.

In Turkish, future meaning is usually built into the verb itself, not added as a separate helping word like English will.

English:

• my cousin will study

Turkish:

• çalışacak

So the future idea is expressed by the suffix -acak / -ecek.

Turkish normally prefers verb-final word order. A very common pattern is:

subject + time + place + verb

So this sentence follows a very natural Turkish order:

Kuzenim yarın kütüphanede ders çalışacak.

That said, Turkish word order is more flexible than English. You can move parts around for emphasis, but the verb often still stays at the end.

For example, Yarın kuzenim kütüphanede ders çalışacak is also possible. It puts a little more focus on tomorrow.

In this sentence, the subject is stated explicitly: kuzenim.

Also, Turkish does not distinguish he and she in the third person singular. So çalışacak by itself can mean:

• he will study
• she will study
• it will study

The exact meaning comes from context or from the subject noun.

To make it negative, add the negative marker -ma / -me before the future ending:

• Kuzenim yarın kütüphanede ders çalışmayacak.
• My cousin will not study at the library tomorrow.

To make it a yes/no question, add the question particle mı / mi / mu / mü after the predicate:

• Kuzenim yarın kütüphanede ders çalışacak mı?
• Will my cousin study at the library tomorrow?

Notice that the question particle is written separately.

A few letters may look unfamiliar to an English speaker:

• ü as in kütüphane: a rounded front vowel, similar to German ü or French u
• ç as in çalışacak: pronounced like ch in chair
• ş as in çalışacak: pronounced like sh in shoe
• ı as in çalışacak: a vowel with no exact English equivalent; it is somewhat like the vowel in the second syllable of sofa, but produced farther back in the mouth

So çalışacak sounds roughly like cha-luh-sha-jak, though not exactly.