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1. see - will tell
- when + HTĐ, TLĐ
2. has studied - was
- HTHT + since + QKĐ
3. are studying
- HTTD + while + HTTD: 2 hành động xảy ra song song
4. saw - came
- QKĐ + when + QKĐ: 2 hành động ngắn trong quá khứ
5. had finished
- QKĐ + when + QKHT: 1 hành động xảy ra trước 1 hành động khác trong quá khứ
6. rang
- when/while + QKTD, QKĐ: 1 hành động đang xảy ra thì có hành động khác xen vào
7. do
- TLĐ + trạng từ + HTĐ
8. was learning - was watching
- at this time last.... = HTTD
9. was watching
10. has lived - moved
11. returned
12. brought
13. will have graduated
By the time + HTĐ, TLHT
14. have already finished
- already = HTHT
15. had finished
- Đã hoàn thành + xảy ra trong quá khứ = QKHT
16. had already arrived
17. has waited 
18. jumped
19. will be
20. will have typed
- Before + HTĐ, TLHT
21. had been disturbed
- Xảy ra trước hành động được chia ở thì QKĐ + bị  động = bị động QKHT
22. was studying
23. was doing
24. wasn't falling  
25. is walking
26. saw
27. is reading
28. were begining
29. came
30. didn't lock
31. was wating
32. had had
33. saw
34. was living
35. got