11. Yesterday thieves broke into the house and stole a lot of fur coats while the guest were dancing.

Giải thích: 2 hành động "đột nhập","lấy trộm" xảy ra liên tiếp nhau nên chia thì Simple past. Hành động "khiêu vũ" xảy ra trươsc 2 hành động kia và vẫn còn xảy ra khi 2 hành động đó xen vô.

12, He had done his homework before he went to the cinema.

Giải thích: Kết hợp: Past Perfect + before + Simple Past.

13, What did you do after you had gone home yesterday?

Giải thích: Kết hợp: Simple past + after + Past perfect.

14, Tom will not come here tomorrow.

Giải thích: Tomorrow là adv đi kèm với thì Simple future.

15, John was watching TV at 8 last evening.

Giải thích: At + time + last evening là adv đi kèm với Past Continuous.

16, Dick had started school before he was seven.

Giải thích: Past perfect + before + Simple Past

17, What were you doing when I rang you last night?

Giải thích: Past continuous + when + Simple Past 

18, John has driven that car ever since I knew him.

Giải thích: Present perfect + since + Past Simple.

19, Columbus discovered America more than 400 years ago.

Giải thích: Ago là dấu hiệu quả Simple Past.

20, When the teacher came in, the pupils were playing games.

Giải thích: When + Past Simple , Past continuous.

21, My brother joined the army when he was young.

Giải thích: Có từ when ta dùng Simple past

22, He lost his job last month and since then he has been out of work.

Giải thích: Last month là dấu hiệu của Simple past, còn since là dấu hiệu của Present Perfect.

23, They think he was here last night.

Giải thích: Last night là dấu hiệu của Simple Past.

24, Lien will not go to the movie theater tomorrow. She will stay at home and watch TV

Giải thích: Tomorrow là dấu hiệu của Future Simple.

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