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写一写我们应该和不应该做的事，写完后可以和同桌分享。
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Unit 3 We should obey the rules
Lesson17
Review
keep your room clean
do housework
go home late
read in bed
Be quiet.
Don’t eat in class.
Don’t make noise in class.
Listen carefully and talk actively.
>>Presentation
must
mustn’t
should
shouldn’t
应该
不应该
必须
禁止
>>Presentation
must
mustn’t
V.原形
must not
You must ,must , must . Good, good , good.