Learn Hardcore Turkish: Perşembe günü kütüphanede ders çalışacağım.

It’s the locative suffix -DA (harmonizing as -da/-de/-ta/-te), which means in/at/on. Because kütüphane ends in a front vowel (e) and a voiced sound, you get -de: kütüphane-de = in/at the library.

Where is the subject I? Why isn’t ben used?

Turkish verbs carry person. The ending in çalışacağ-ım already means I, so ben is optional. Use Ben for emphasis or contrast: Ben Perşembe günü… çalışacağım (I, as opposed to someone else).

How is çalışacağım built?

Verb stem: çalış- (to work; with ders it means to study)
Future tense: -AcAK → çalışacak (A = a/e by vowel harmony; here a)
1st person singular: -Im → attaches and softens the final k to ğ: çalışacağ-ım Result: çalışacağım.

How do you pronounce the letter ğ in çalışacağım?

Turkish ğ (soft g) is not a hard g; it lengthens or smooths the transition between vowels. In çalışacağım, it lengthens the preceding a; you don’t pronounce a hard g.

Why is it ders çalışacağım and not dersi çalışacağım?

Ders çalışmak is a fixed expression meaning to study (schoolwork). The noun ders stays bare. If you specify a particular lesson/material, you can mark it: dersimi çalışacağım (I will study my lesson) or matematik çalışacağım vs matematiği çalışacağım (the specific math material).

Can I drop günü and just say Perşembe?

Yes. Perşembe kütüphanede ders çalışacağım is perfectly natural. Perşembe günü adds a slight emphasis and is very common in time expressions.

How do I say this/next/last Thursday?

This Thursday: bu Perşembe
Next Thursday: gelecek Perşembe or önümüzdeki Perşembe; also colloquial haftaya Perşembe
Last Thursday: geçen Perşembe

What’s the typical word order? Where do time and place go?

Turkish is generally SOV (Subject–Object–Verb), with adverbs like time and place before the verb. A common and natural order is:

Time → Place → (Object) → Verb So: Perşembe günü kütüphanede ders çalışacağım. You can move time/place earlier for emphasis, but the verb normally stays last.

How do I say to the library rather than in the library?

Use the dative -A instead of locative -DA:

kütüphane-ye = to the library Examples:
Kütüphane-ye gideceğim. (I will go to the library.)
Kütüphane-de çalışacağım. (I will study in the library.)

Could I use the present continuous instead of the future here?

For planned or intended future actions, Turkish prefers the future -AcAK: çalışacağım. The present continuous -yor can indicate a near-certain scheduled future in some contexts (e.g., travel plans), but with a clear future time like Thursday for an intention, -AcAK is the normal choice. Future continuous exists too: çalışıyor olacağım (I will be studying), which focuses on being in the middle of the activity at that time.

How do I make it negative or ask a yes/no question?

Negative: insert the negative -ma/-me before the future, with a buffer y:
Perşembe günü kütüphanede ders çalışma-y-acağım. → çalışmayacağım.
Yes/no question: add the question particle mi/mı/mü/mu (separate word, with vowel harmony):
Perşembe günü kütüphanede ders çalışacak mısın? (Will you…?) |
…çalışacak mıyım? (Will I…?)

Do I need an article for library?

Turkish has no the. Kütüphanede can mean in the library/in a library depending on context. You can add bir for an indefinite some: bir kütüphanede, but it’s used only when you specifically want to stress the indefiniteness.

Is Perşembe capitalized?

According to standard Turkish orthography, days and months are not capitalized in running text unless they start the sentence or are part of a proper name. Here it’s capitalized because it begins the sentence. Mid‑sentence you’ll often see perşembe günü.

Is the -de in kütüphanede the same as the separate particle de/da meaning also?

No. In kütüphane-de, -de is a locative suffix and is attached to the word. The additive particle de/da (also, too) is written separately, follows vowel harmony for a/e but never turns to te/ta:

Ben de Perşembe günü kütüphanede ders çalışacağım. (I will also…)

How do I say on Thursdays (habitually)?

Use the plural-like habitual form:

Perşembeleri kütüphanede ders çalışırım.
You can also say Perşembe günleri… for the same habitual meaning.