9. When did you start your hobby?
- How long
10. Why don’t we go swimming this afternoon?
- What about
11. How about going to the movies tonight?
- Let’s
12. The last time I saw my uncle was two years ago.
- I haven’t
13. My father likes to do gardening at the weekend.
- My father enjoys
14. Lan didn’t go to school because she was sick.
- Lan was sick
15. This is the first time I’ve eaten this kind of food.
- I haven’t 16. If the homework is difficult, I will ask you for help.
- Unless
9. how long have you started your hobby
cấu trúc : how long have/has + s + v3 + ... ?
10. what about going swimming this afternoon?
cấu trúc : what/how + about + v_ing + o
11. let's go to the movies tonight
cấu trúc : let's + v_inf + (o)
12. i haven't seen my uncle for two years
cấu trúc : s + haven't/hasn't + p2 + since/for
13. my father enjoys doing gardening at the weekend
cấu trúc : enjoys + v_ing
14. lan was sick so she didn't go to school
cấu trúc qkd với động từ to be : s + was/were + v3 + o
15. i haven't eaten this kind of food before
cấu trúc : s + haven't/hasn't + p2 + before
16. unless the homework is easy, i will ask you for help
if.. not = unless : trừ khi/nếu không