11. If you don't get a visa, you can't visit the United States.

`->` Unless = If ... not

12. Peter asked if he could borrow Janet's typewriter.

`->` Câu trần thuật yes, no: S + aksed + O + if + S2 + V lùi thì

13. She has worked as a secretary for 5 years.

`->` S + started + Ving + thời gian + ago = S + has/have + Vpp + for + thời gian

14. My French friend isn't used to driving on the left.

`->` be used to + Ving: trở nên quen với

15. The owner of the house is thought to be abroad.

`->` Câu bị động với động từ tường thuật

16. If we had had enough money, we would have gone on holiday.

`->` If 3: If + S1 + had + Vpp, + S2 + would have + Vpp

17. The sea was too rough for the children to go swimming.

`->` S + be + too + adj + for SO + to V

18. I wish I you hadn't failed your driving test.

`->` Câu mong ước nên lùi thì, chuyển khẳng định sang phủ định

11 You can’t visit the United States unless you get a visa.

12 Peter asked Janet if he could borrow her typewriter.

13  She has worked as a secretary for five years.

14 My French friend isn't used to driving on the left.

15 The owner of the house is thought to be abroad.

16 If we had had enough money, we would have gone on holiday.

17 The sea was too rough for the children to go swimming.

18 I wish you hadn't failed yoru driving test.