Đáp án:
1. Yesterday she flew to London with her family. At the moment they are visiting the centre of the city.
2. From time to time she fall off the bike is so hurt.
3. She just lent her motorbike to her little brother.
4. Jack is preparing food for dinner in the kitchen for the time being.
5. It has rained a lot since January.
6. He has worked together in HCM City for 5 years.
7. He has eaten breakfast since 7.15.
8. They just forgot my name and it was very funny.
9. She always comes home from work late nowadays.
10. Hellen just lay in bed becaused she is very tired.
11. takes (often -> HTĐ)
12. didn't watch (Last night -> QKĐ)
13. have studied (for half an hour -> HTHT)
14. is looking (Look! -> HTTD)
15. Have you known (for a long time -> HTHT)
16. plays (usually -> HTĐ)
17. is washing (At the moment -> HTTD)
18. has fallen (three times -> HTTD)
19. has she read (until now -> HTHT)
20. has taught (for 20 years -> HTHT)