21. were (ước hiện tại)
22. would telephone (ước tương lai)
23. would help
24. would come
25. would make
26. were hurry
27. opened
28. showed
29. waited
30. wrote
Ex. 2:
1. had (book thiếu "s")
2. would meet
3. were
4. would win
5. played
6. would
7. had been
Cứ có tomorrow, next, ... => ước ở tương lai (would + V)
yesterday => ước ở quá khứ (had been + V_ed/V3)
Còn lại ước ở hiên tại (chia quá khứ đơn)
