=>
I/
1. died
2. went
3. lived
4. sold
5. did you see
6. Did he come
7. didn't meet
8. was
9. studied
10. weren't
Thì QKĐ :
Động từ tobe 
(+) S + was/were +...
(-) S + was/were + not...
(?) Was/were S...?
Động từ thường
(+) S + V2/ed
(-) S didn't V
(?) Did S V?
II/
1. left
-> this morning (QKĐ)
2. was
-> in 2001 (QKĐ)
3. told
-> yesterday (QKĐ)
4. didn't have (QKĐ)
5. didn't know (and -> 2 động từ chia cùng thì)
6. bought
-> yesterday (QKĐ)
7. have known 
-> for a long time (HTHT, S have/has V3/ed)
8. to live
-> used to V : đã từng
9. have taught
-> since 1997 (HTHT)
10. have done/got
-> HTHT since QKĐ
11. joined/was
-> when he was 18 (QKĐ)
12. served/went
-> hành động liên tiếp xảy ra trong QK (QKĐ)
13. have you lived/have lived
-> how long + HTHT : bao lâu
14. finished/was
-> in 2019 (QKĐ)
15. has gone
-> thì HTHT (hành động vừa mới xảy ra)