IX:

1I eat less chocolate than she

little->less( từ so sánh hơn đặc biệt)

2 Vinh is always forgetting his homwork

keep doing something <=> be always + V_ing ( cấu trúc phàn nàn )

3 It's very importan to keep the environment

It + be + adj 

4 Lan isn't helped to do the homework

câu bị động

5 I haven't spoken to her for three years

chuyển từ thì hiện tại tiếp diễn sang thì quá khứ

6 tam used to type fast

use to +V: đã từng

7when did you use the car?
8We have lived here since 15 years
9How about meeting ínide the center, at the cafe corner?

cấu trúc gợi ý how about + v-ing

10 Nam is strong enough to do heavy work

cấu trúc của enough: S+be+adj/adv+enough to +v