The past perfect:
1. Yesterday they went home after they ( finish) their work.
2. When we came to the stadium, the match already ( start).
3. many people ( move) to the new place before the storm occurred.
4. I sat down and rested after they ( go).
5. Before he died, he (be) ill for several days.
6. Last night before he watched TV, he ( do) the exercise.
7. Ba went to the department after she ( clean) the floor.
8. When I got to the party, they ( go) home.
9. By the time the police arrived, the house ( be) burned down.
10. By last year, twenty schools in this province ( be) build).
1.had finised
2.has already started
3.had movied
4.had gone
5.had been
6.had done
7.had cleaned
8.had gone
9.had been
10.had been
#chucbanhoctotnha
`=>`
1. had finished
2. had already started
3. had moved
4. had gone
5. had been
6. had done
7. had cleaned
8. had gone
9. had been
10. had been
Thì quá khứ hoàn thành (past perfect): S + had + PII + O