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Lesson 29 Come in, Amy. 请进，Amy.
授课内容：
句型
1.come in
2, shut the door.
3. Open the window and air the room.
4. What must I do
语言点
1. 祈使句
用于表达命令、请求、劝告、警告、禁止等的句子叫做祈使句，祈使句因对象（即主语）是第二人称，所以通常都省略。
肯定句
Do型
Stand up. Sit down. Point to me.
Be型
Be quiet. Be happy. Be careful.
Let型
Let’s go. Let me help you. Let him come in.
否定句
Don’t型
Don’t stand up. Don’t point to me. Don’t be noisy.
Let…not型
Let’s not go. Let him not come in. / Don’t let him come in.
No型 No smoking. No photos.
2. 情态动词must的用法
情态动词本身无人称和时态的变化，后面要跟动词原形。
位置：放在主语后面，动词的前面。
意义：可以表示命令，推测。
命令 “必须”
肯定句
主语+must+do sth.
I must go now.
She must go now.
否定句
一般疑问句
特殊疑问句
推测 “一定”
那一定是我的狗。
It must be my dog.
它一定是我的书包。
It must be my bag.
动词短语
Come in shut the door open the window air the room
make the bed dust the dressing table sweep the floor
重点短语
Put on 穿上，戴上
Take off 脱下
Turn on 打开（电源） 和open的区别
Turn off 关闭（电源） 和close/shut的区别
三、随堂练习题
选择最适合的词或短语填空。
1.__________your books, please.
A. Turn on B. Open C. See
2. The floor is dirty. __________ it.
A. Clean B. Dust C. Sweep
3. The electric cooker is on. __________ , please.
A. Turn it off B. Shut it C. Turn it on
4. Are you hot __________ your coat.
A. Turn off B. Put on C. Take off
5. __________ me a cup, the one on the table.
A. Put B. Clean C. Give
6. Lulu must __________ the blackboard.
A. clean B. sweep C. dust
7. Your clothes are on the bed. __________ them in the wardrobe.
A. Put B. Shut C. Empty
8. After class, please __________ your books at home.
A. see B. open C. read
9. There is water in the glass. __________ it.
A. Empty B. Clean C. Dust
10. It is very dark in the room. __________ the lights.
A. Shut B. Turn on C. Open
11. My bed is untidy. I must __________ it.
A. clean B. dust C. make
12. This magazine is new. I must __________ it.
A. read B. see C. put
二．根据给出的情景，用正确的动词填空。
The door is shut. You must __________ it.
The kitchen is dirty. You must __________ it.
The pencil is blunt. You must __________ it.
The floor is dirty. You must __________ it.
The box is full. You must __________ it.
The windows aren’t open. You must __________ them.
The cupboard is dusty(有灰). You must __________ it.
My car isn’t clean. I must __________ it.
The glasses aren’t empty. You must __________ them.
These knives aren’t sharp. You must __________ them.
Our office is dusty（有灰）. I must __________ it.
The cases are open. You must __________ them.

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