人教版九年级英语上册《Teenagers should be allowed to choose their own clothes》SectionA PPT教学课件(第3课时)，共35页。
Objectives
To summarize the passive voice with the modal verbs.
To learn to use the grammar properly.
To learn some foreign cultures and learn to make rules.
Free talk
What can you do at school?
What can’t you do at school?
Do you agree or disagree?
Look at these sentences.
I think students should be allowed to do homework with friends.
Sixteen-year-olds should not be allowed to drive.
Do you think sixteen-year-olds should be allowed to choose their own clothes?
含有情态动词的被动语态
肯定句：主语+ 情态动词+be+ 动词过去分词.
否定句：主语+情态动词+not+ be+动词过去分词.
疑问句：情态动词+ 主语+ be+ 动词过去分词?
转变方法
(一)将主动语态的宾语变成被动语态的主语。
(二)将含情态动词的主动句式变成被动句式，即：“情态动词+动词原形”变成“情态动词+be+过去分词”，然后再在其后加“by+主动句中的主语(人称代词用宾格)”。by短语也可省略。
含有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)
含有情态动词should的被动语态
1.含有情态动词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.
(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).
►Teenagers should be allowed to choose their own clothes.
应该允许青少年选择他们自己的服装。
►Students should not be allowed to have part-time jobs.
不应该允许学生们做兼职工作。
►Can these books be taken out of the reading room?
可以把这些书带出阅览室吗？
►When must the work be finished?
这些工作必须什么时候完成？
Rewrite the sentences according to the example.
1.You must clean your bedroom every day.
Your bedroom must be cleaned every day.
2. Parents should encourage teenagers to do social work for their community.
Teenagers should be encouraged (by their parents) to do social work for their community.
3. Can Lucy do her homework tomorrow instead?
Can the homework be done (by Lucy) tomorrow instead?
Homework
Are you satisfied with the rules at home? Try to write a letter to your parents and talk about the rules in a polite way.
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