四、句型转换。
1. We'd better make a noise in the library. (改为否定句)

2. Wait in line, please. (改为否定句)

3. We shouldn't make a noise. (写同义句)

4. I am reading. (对画线部分提问)

5. Don't litter on the floor. (作出回答)

1. We'd better not make a noise in the library.
2. Don't wait in line, please.
3. We should keep quiet.
4. What are you doing?
5. I'm sorry, I won't.

1. 你应该照顾好你的小妹妹。
You take care of your little sister.
2. 上课时不要大声说话。
Don't in class.
3. 我们应该养成一个好习惯。
We should a good .
4. 下雨了,你最好带上伞。
It is . You take your umbrella.
5. 不要卧床看书。
Don't bed.

1. should
2. talk loudly
3. have; habit
4. raining; had better
5. read in