Unit7Teenagers should be allowed to choose their own clothes. Grammar & Writing课件（18张PPT）

课件18张PPT。Unit7Teenagers should be allowed to choose their own clothes. Grammar & Writing 含情态动词的被动语态常用的情态动词有：can, could (能；会), may; might (可以)
must(必须), should(应该), will; would(愿意)
have to(必须；不得不), had better(最好)Grammar1.含情态动词should的被动语态结构式：
　　　should + be+及物动词的过去分词。
　(1)肯定句结构为：主语+should be+及物动词的过去分词+ (by+宾语)。
　eg: 你应该自己完成作业。
　Your homework should be finished by
yourself.含情态动词should的被动语态　(2)否定结构为：主语+ should + not+ be +及物动词的过去分词+ (by+宾语)。　　
　eg：不应该允许青少年晚上外出。
　Teenagers should not be allowed to go out at night.
(3)特殊疑问句结构为:疑问词+一般疑问句？　　
　eg：应该允许学生们做什么？
　What should students be allowed to do?
　(4)一般疑问句结构为:Should +主语+ be+及物动词的过去分词+ (by+宾语)？
　回答:Yes，主语+should./No，主语 + shouldn’t.
　eg:这些小树应该每天浇水吗？
　Should these young trees be watered every day?
　Yes, they should. /No, they shouldn’t.
　对，应该。/不，不应该。
　
主动句变被动句的步骤与其它情况相同。We should allow teenagers to watch TV on Sunday. Teenagers should be allowed to watch TV on Sunday( by us).People may catch fish in the river.Fish may be caught in the river (by people).1.I can finish the work.
The work can be finished by me.
一般问句：
Can the work be finished by you?2.We should plant many more trees. Many more trees should be planted by us.一般问句：
Should many more trees be planted by us?PracticeTeenagers should be allowed to drive the car .3.Parents should allow teenagers to drive the car.一般问句：
Should teenagers be allowed to drive the car ?Trees must be watered every day.4.They must water trees every day.一般问句：
Must trees be watered every day?Sixteen-year-olds should be allowed to drive.
(改为否定句)Sixteen-year-olds shouldn’t be allowed to drive.I think the work should be done at once.
(改为否定句)I don’t think the work should be done at once.1.The flowers ___often.
A. must be water B. must be watered
C. must watered D. must water
2. The books may___ for two weeks.
A. be kept B. be borrowed
C. keep D. borrow3 The broken bike____ here by Mr Smith.
A. can mend B. can mended
C. can be mend D. can be mended
4.Young trees should ________ every year.
A. be planted B. planted
C. plant D. are plantedWriting　　本单元写作针对某人、某事或某活动制定规则或提建议。写此类短文时，最重要的是掌握情态动词的用法以及相关句型。再根据所给的提示、要求等明确中心内容，就能写出一篇好文章来。
　　常用句型归纳如下：
1.We must/can…;
2.We mustn’t/can’t…;
3.We should/shouldn’t…;
4.We should/shouldn’t be allowed to…;
5.You’d better…;
6.Why not…　　假设你叫大明，你的一个美国笔友托尼将到中国来并在你们班学习。请写信告诉他你们班的班规，80词左右。写作注意点1. 语态、时态要准确无误。2. 主谓语要一致，主语的人称和数要和谓语一致。3. 注意人称代词的宾格形式。4. 注意冠词用法。5. 注意拼写、标点符号和大小写。标点符号特别注意汉英的不同。注意语法、句法知识的灵活运用。Dear Tony，
　　I am glad to know that you will come to our class. You asked me about the rules here. Let me tell you some.
We start class at 8 o’clock in the morning. You should be in the classroom before that. When the class begins，you should sit silently on your seat. You mustn’t speak to anyone else when the teacher is giving the lesson.sample writing If you want to answer the teacher’s question，put your hands up first. When the teacher calls your name，you can stand up and answer it. If the teacher gives you some homework to do，you ought to finish it on time. I hope you will do well in all the lessons here.
Yours,
Daming Thank you!