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必修4《Grammar》精品PPT课件优质课下载
some sentence patterns will help you…
obligation
You must / have to….
You are required to….
It is necessary to….
It’s not necessary to….
You don’t have to….
You aren’t required to….
You’re allowed to….
You can ….
You may…
permission
prohibition
You can’t / mustn’t….
You’re forbidden to….
It’s against the rules to….
Revision of modal verbs
Underline the correct verb.
1
1 You should / shouldn’t visit the
Three Gorges. They’re beautiful.
2 Boats can / can’t reach the upper
part of the Yangtze River. It’s too
dangerous.
3 Travellers must / mustn’t show