人教版九年級英語上冊《Teenagers should be allowed to choose their own clothes》SectionA PPT教學課件(第3課時)，共35頁。
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?
含有情態(tài)動詞的被動語態(tài)
肯定句：主語+ 情態(tài)動詞+be+ 動詞過去分詞.
否定句：主語+情態(tài)動詞+not+ be+動詞過去分詞.
疑問句：情態(tài)動詞+ 主語+ be+ 動詞過去分詞?
轉(zhuǎn)變方法
(一)將主動語態(tài)的賓語變成被動語態(tài)的主語。
(二)將含情態(tài)動詞的主動句式變成被動句式，即：“情態(tài)動詞+動詞原形”變成“情態(tài)動詞+be+過去分詞”，然后再在其后加“by+主動句中的主語(人稱代詞用賓格)”。by短語也可省略。
含有情態(tài)動詞的被動語態(tài)
常用的情態(tài)動詞有：
can, could (能；會), may; might (可以)
must(必須), should(應(yīng)該), will; would(愿意)
have to(必須；不得不), had better(最好)
含有情態(tài)動詞should的被動語態(tài)
1.含有情態(tài)動詞should的被動語態(tài)結(jié)構(gòu)式：
should + be+及物動詞的過去分詞。
(1)肯定句結(jié)構(gòu)為：主語+should be+及物動詞的過去分詞+ (by+賓語)。
eg: 你應(yīng)該自己完成作業(yè)。
Your homework should be finished by yourself.
(2)否定結(jié)構(gòu)為：主語+ should + not+ be +及物動詞的過去分詞+ (by+賓語)。
eg：不應(yīng)該允許青少年晚上外出。
Teenagers should not be allowed to go out at night.
(3)特殊疑問句結(jié)構(gòu)為：疑問詞+一般疑問句？
eg：應(yīng)該允許學生們做什么？
What should students be allowed to do?
(4)一般疑問句結(jié)構(gòu)為：Should +主語+ be+及物動詞的過去分詞+ (by+賓語)？
回答：Yes, 主語+should./ No, 主語 + shouldn’t.
eg:這些小樹應(yīng)該每天澆水嗎？
Should these young trees be watered every day?
Yes, they should. /No, they shouldn’t.
對，應(yīng)該。/不，不應(yīng)該。
主動句變被動句的步驟與其它情況相同。
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.
應(yīng)該允許青少年選擇他們自己的服裝。
►Students should not be allowed to have part-time jobs.
不應(yīng)該允許學生們做兼職工作。
►Can these books be taken out of the reading room?
可以把這些書帶出閱覽室嗎？
►When must the work be finished?
這些工作必須什么時候完成？
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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