21. The painting was thought to have been destroyed.(câu bị động)

S+be (...)+ V_ed/ cột 3+ ....

22.The tickets is too expensive for me to buy it.

S+ be (...)+ too+adj+(for +O)+ to Vnt...

23. It took Peter three hours to repair his house.

It+ take(...)+ O+ thời gian/tiền+to Vnt+...

24. Unless she leaves now, you will miss the train.

Unless=If+ .... Not

25. Mai said Jane why he was so late and if his car had a flat tire.

Câu trần thuật và câu hỏi có từ để hỏi.

S1+ said(that)+ S2+ V<lùi thì>

S1+ asked/told...+O+Wh?+S2+V<lùi thì>

26. It is so expensive that my father buys this house for me.

It+ be (...)+ so+ adj+ that+ 1 câu: đến nỗi mà ....

27. I don' t finish the work today unless I will pay you 

Unless=If...not

28. In spite of being a young girl, she is quite experienced

In spite of+N/V_ing

Although+ 1 câu

Good luck!