How would you translate into Turkish the following sentences ?

If you can’t find your hat, take his. (his = onun or onunki?)  

The books on the table belong to me. / The books on the table are mine. 

Is the book yours? / Does the book belong to you?

That car is hers, not his. (If it is not possible translate: The car belongs to the girl, not to the boy)

Thank you a lot for your help!

Up. Common interest.

My Try:

1. Șapkanı bulamıyorsan onunkini al.

2. Masadaki kitaplar benimdir.

3. Kitap senin mi?

4. Araba kızındır, erkek çocuğun değil.

I´m just a learner, wait for corrections, Tuncay.

I was wondering why it sounds to me like -ki- is needed only in the first example. Is it because the possessive pronouns in 2. - 4. are predicatives? Maybe someone can answer this, too.

# 4

araba onun değil ona ait olmak