=>
11. His summer holiday lasted three months.
-> last : kéo dài
12. Will you please take care of the children?
-> take care of ~ look after : chăm sóc
13. You drank less orange juice than he did.
-> less ...than : ít hơn
14. She spends four hours each day doing her homework.
-> spend time Ving ~ take time to V
15. Nga studies well.
-> study là động từ (cần trạng từ)
16. You did the experiments yesterday, didn't you?
-> vế giới thiệu khẳng định -> câu hỏi đuôi phủ định
17. They enjoyed listening to music last night.
-> enjoy Ving : thích thú, yêu thích
18. She took care of the sick people.
-> take care of ~ look after
19. Were you interested in watching TV?
-> be interested in : thích thú, quan tâm
20. A year has twelve months.
-> have/has : có