5. had already sold
6. has stopped
7. have turned
8. had just closed
9. hadn't already seen
10. have eaten
11. haven't seen
12. had told
13. had become
14. had started
15. had done / had made
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Cấu trúc QKĐ: S + V-ed/ VQK (bất quy tắc) + O
Cấu trúc HTHT: S + have/ has + VpII...
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@chy31