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Step1 热身练练练 一、写出句子中所缺的介词。
1.Peter is a good boy ____ school.
2.He often makes a mess ____ his room.
3.He is not a good boy ____ home.
4. Peter’s mother writes some home rules ____ him.
5. He often reads ____ bed.
at
at
in
for
in
You should…/You shouldn’t…
Review
Step2 Presentation
What do you think of them?
Do they obey the rules?
Look at the picture and discuss.
Just talk
should
shouldn’t
V.原形
must
mustn’t
Learn the new words and phrase
检查师友朗读情况
must: aux. 必须，一定
mustn’t = must not:禁止 ; 不可以 ; 不许
You should get up early.
You must get up early.
You shouldn’t go to bed late. You mustn’t go to bed late.