have

Used with a past participle to make the perfect tenses.

• I have already finished all my homework.
  Bütün ödevlerimi çoktan bitirdim.
• She had left before we arrived.
  Biz varmadan önce o çıkmıştı.

Used in short answers and question tags instead of repeating the whole verb.

• Have you met Elif? – Yes, I have.
  Elif'le tanıştın mı? – Evet, tanıştım.
• You've seen this film, haven't you?
  Bu filmi izledin, değil mi?

Used at the start of a clause instead of if, in formal conditional sentences.

• Had I known you were coming, I'd have cooked.
  Geleceğini bilseydim yemek yapardım.
• Had we left earlier, we would have caught the train.
  Daha erken çıksaydık treni yakalardık.