II

Khẳng định của used

Used to + V

Phủ định của used

Didn't use to +V

1....to ride horse through ..

2....to do the gardening on sundays

3....to speak E in the class

4.....to do the housework

5.....to work in companies

6.....to be noisy in the class

7.....to be busy at weekend

8.....to be afraid of ghosts

9.....to be lazy

II

1. We should turn off the lights when we don't use them.( Should + V_bare)
2. I think the construction sites in our country are causing noise pollution.( Hiện tại tiếp diễn)
3. Students should do many things to reduce pollution.( Should + V_bare)
4. If we keep polluting the air, the effects of climate change will be worse.( Câu điều kiện loại 1)