I have signed the contract

giúp mình câu 14 ạ
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12. Nina has read the newspaper already.
The newspaper has been read by Nina alrea
Nida alrea
13. They have seen these movies yet.
this movies have been seen by them yet..
14. I have signed the contract.
15. These men have bought the tickets.
The tickets have been bought by these men.
16. I have bought this teddy bear in that shop
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17. Vicky has found her hat.
her hat has been found by vicky Vicky's hat
18
1have 1oet mmy bag.