1. had been working ( quá khứ hoàn thành tiếp diễn )

2. had started ( qk hoàn thành)

3. bought ( qk) 

4. had never taken ( qk hoàn thành)

5. stayed - visited - had been - had like - had decide ( qk-qk-qk hoàn thành-qk hoàn thành-qk hoàn thành

6. had been developing ( quá khứ hoàn thành tiếp diễn )

7. had already discussed- had made - had phoned- felt- hadn't waited ( qk hoàn thành- qk hoàn thành-qk hoàn thành-qk-qk hoàn thành)

8. had been running (quá khứ hoàn thành tiếp diễn )

HỌC TỐT!!

1.had been working

2.had started

3.bought

4.had never taken

5.stayed/visited/had been/had like/had decide

6.had been developing

7.had already discussed/had made/had phoned/felt/hadn't waited

8.had been running

Xin ctlhn