Learn Hardcore Turkish: Yeni kontrol listesi hazırladım; siz de kendi listenizi oluşturun. - I prepared a new checklist; you should create your own list too.

de/da is the additive particle meaning also/too/as well.
It is written as a separate word (never attached) and never takes the -t/-ta/-te variants.
It follows front/back vowel harmony: after a word with a front vowel (e, i, ö, ü) you use de; after a back vowel (a, ı, o, u) you use da. Since siz has a front vowel (i), we get siz de.
Contrast with the locative suffix -de/-da/-te/-ta (meaning “in/at/on”), which is attached to the word: evde “in the house.” The additive de stays separate: evde de “also in the house.”

Why is it siz, not sen?

siz is used for:
- Addressing more than one person (plural “you”).
- Polite/formal address to one person (the “vous” form).
The imperative oluşturun is the form that matches siz. If you used sen, the imperative would be oluştur.

Could I omit the pronoun and just say Kendi listenizi oluşturun?

Yes. Turkish often drops subject pronouns because person/number are in the verb ending.
Here, siz de is kept for emphasis/contrast: “you too (as well as me/others).” Without siz, you lose that explicit “too” emphasis.

What does kendi add to listenizi?

kendi is a reflexive/contrastive intensifier meaning own, highlighting that it should be your own list (not someone else’s).
Without it: listenizi oluşturun = “create your list.”
With it: kendi listenizi oluşturun = “create your own list,” emphasizing ownership/independence.

Why does listenizi end with -i? Is that the accusative?

Yes. listenizi is in the accusative case because it’s a definite/specific direct object, and possessed nouns are treated as specific.
Morphology: liste + niz + i → listenizi
- liste = list
- -niz = your (2nd person plural/polite possessive; here it becomes -iniz by vowel harmony, yielding listeniz)
- -i = accusative (since the word ends in a consonant, no buffer is needed)
If you were speaking to one person informally (sen), it would be listeni (liste + n + i).

Then why doesn’t kontrol listesi have accusative -i in the first clause?

Because it’s an indefinite object: “(a) new checklist.” Indefinite direct objects remain bare (no -i).
If it were definite/specific, you’d say kontrol listesini hazırladım (“I prepared the checklist”).

Do I need bir as in Yeni bir kontrol listesi hazırladım?

bir (“a/an”) is optional with adjectives. Both are correct:
- Yeni kontrol listesi hazırladım — perfectly natural.
- Yeni bir kontrol listesi hazırladım — slightly more explicit/neutral about indefiniteness.
In everyday speech, you’ll hear both.

What kind of structure is kontrol listesi?

It’s an indefinite compound noun (isim tamlaması): kontrol (modifier) + liste-si (head + 3sg possessive).
The -si on listesi is the hallmark of this compound pattern, not actual possession by “control.”

How does the imperative oluşturun work morphologically?

Root: oluştur- (“to create/form”)
Imperative 2nd person plural/polite: -ın/-in/-un/-ün by vowel harmony. Last vowel of oluştur is u (back/rounded), so we use -un → oluşturun.
Very formal/written style may use oluşturunuz.

Could I say Siz kendi listenizi de oluşturun instead of Siz de kendi listenizi oluşturun? Does the place of de matter?

Yes, placement changes what is being focused as “also”:
- Siz de kendi listenizi oluşturun = You too (as well as me/others), make your own list.
- Siz kendi listenizi de oluşturun = You, also make your own list (in addition to some other thing you’re doing or some other list).
de should follow the element it focuses.

Is the semicolon necessary? Could I use a comma, a period, or ve?

Semicolon neatly links two closely related independent clauses.
Acceptable alternatives:
- Comma: … hazırladım, siz de … (common in informal writing).
- Period: … hazırladım. Siz de … (neutral).
- ve: … hazırladım ve siz de … (adds an explicit “and,” slightly heavier).

Are hazırlamak and oluşturmak interchangeable here?

Often, yes:
- hazırlamak = to prepare/compile (a document, list, plan, meal).
- oluşturmak = to create/form/constitute (more technical/neutral).
Alternatives:
- yapmak is understandable but more general/colloquial for lists.
- kurmak doesn’t fit for lists.

Why is hazırladım used, and how is it formed?

It’s simple past, 1st person singular: hazırla- (prepare) + -dı (past) + -m (1sg) → hazırladım.
The past suffix -dı/-di/-du/-dü follows vowel harmony; after a voiceless consonant it becomes -tı/-ti/-tu/-tü. Here it follows a vowel, so -dı is used.

How should I pronounce tricky sounds like ı and ş in words such as hazırladım and oluşturun?

ı (dotless i): a central, unrounded vowel (like the “e” in “the” when unstressed); e.g., hazırladım [ha-zır-la-dım].
ş = “sh.”
Stress is typically on the last syllable of words: ha-zır-la-dım, oluş-tu-run. In compounds, primary stress tends to fall near the end of the phrase: kontrol lis-te-si.