外研版九年级英语上册《Language in use》Museums PPT课件下载(第1课时)，共26页。
Read the sentences:
No shouting, please!
Don't cross that rope!
Don't be rude!
If you ever go to London, make sure you visit the Science Museum.
Read and understand the red words:
Don't touch.
No photos.
No entry.
No smoking.
No shouting.
If you want to fill a bag with sand, control a kind of truck on wheels and move it into the correct place.
Fill in the blanks:
1. If you ________ (want) to get good grades, _______(study) harder.
2. If it _____ (get) colder, _____ (put) on more warm clothes.
3. If you ______ (want) to know the way, _____ (ask) the policeman.
4.If you _____ (visit) London, _____ (take) a boat trip on the river.
5. If the machine _____________ (not work), ______ (buy) a new one, please.
Grammar
1. No + v. -ing/ n.! 禁止做……
eg. No talking!
No photos!
2. 否定祈使句: Don't + v. 不能做……
eg. Don’t talk.
Don't take photos.
3. mustn't + v. 禁止
eg. You mustn’t talk.
You mustn't take photos.
4. can't + v. 不允许
eg.You can’t talk.
You can't take photos.
5. You aren’t allowed to + v. 不允许对方做某事
eg.You aren’t allowed to talk.
You aren't allowed to take photos.
if从句+祈使句，表达建议，相当于汉语的“如果……，就……”。if引导的从句可以放在主句之前，也可以放在主句之后。如果放主句前要注意用逗号分开主从句，放主句后则不需要。）
eg. If you want to play back, press the red button.
如果你想回放，按红色按钮。
Wait for thirty seconds if the red light doesn't come on.
如果红灯亮，请等待三十秒。
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