Exercise 5: Put the verbs into the Past Simple or Past Perfect tenses.
1. He (be)------------------------------- in prison for twenty-seven years last year.
2. The policeman (tell)------------------------------------ us to come back in two hours yesterday.
3. My aunt and I slowly (walk)---------------------------------- back to the house last night.

1 had been

- Quá khứ hoàn thành, dấu hiệu: for twenty-seven years last year

-> (+) S + had + V3/ed

2 told 

- Quá khứ đơn, dấu hiệu: yesterday

-> (+) S + V2/ed

3 walked 

- Quá khứ đơn, dấu hiệu: last night

-> (+) S + V2/ed

` 1`. was

` 2`. told

` 3`. walked

` -------`

` @` Quá khứ đơn

` -` V thường

` (+)` S + V-ed/V2 + ...

` (-)` S + didn't + V-inf + ....

` (?)` Did + S + V-inf + ...?

` -` V tobe

` (+)` S + was/were + ....

` (-)` S + was/were + not + ...

` (?)` Was/were + S + ...?

` -` DHNB : last, ago, yesterday, past, ...