8. was giving - asked - to phone ( câu tường thuật thì hiện tại tiếp diễn -> quá khứ tiếp diễn )
9. will be
10. would travel ( câu tường thuật: will -> would )
11. not to be ( Remind O + (not) to V: nhắc nhở ai làm gì )
12. will replace - will be - to study
13. could be
14. Will she take
15. would - to live
16. used - were
17. made ( have + V3: thì HTHT )
18. would be
19. had watched
20. would buy