Unit 7 Teenagers should be allowed to choose their own clothes. 第2课时 考点讲解(共22张PPT)

Unit 7 Teenagers should be allowed to choose their own clothes.
R·九年级全一册
第二课时
Parents are normally our much-loved persons in our life.
Lead in
But sometimes they may be very strict with us.
What family rules do you think should be changed?
I should be allowed to get up late sometimes.
We should be allowed to eat some ice-cream.
Teenagers should be encouraged to make their own decisions.
We may be allowed to take photos if we don’t use a flash.













含情态动词的被动语态用来说明某个被动性动作所反映出的感情和态度。初中阶段的常见情态动词有：can, may , need , must , should等。
谓语部分含有情态动词的被动语态的构成是：
情态动词+be+过去分词
Language points
1. 将主动语态的宾语变成被动语态的主语。
2. 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。
一、被动转变方法
You should finish your homework first.
Your homework should be finished (by you) first.
You can take this magazine home.
This magazine can be taken home (by you).
含情态动词的疑问句、否定句的变化均需借助于情态动词完成。
一般疑问句: 直接将被动语态的陈述句中的情态
动词提前。
Must this task be finished at once?
这项任务必须立即完成吗？
二、句式结构
注意: 含情态动词的被动语态的一般疑问句的回答，应保留原情态动词，但must表“必须”时，其否定回答应用needn’t；need表“必要”时，其肯定回答应用must。如：
Must my exercise book be handed in now?
Yes, it must.
Must my book be returned tomorrow?
No, it needn’t.
You can keep it for two months.
2. 特殊疑问句: 由特殊疑问词加上被动语态的
一般疑问句构成。
3. 否定句: 在情态动词后面加上not或never即可，
但must表“必要” 时否定式为needn’t。
When must this task be finished?
This task needn’t be finished at once.
4. 反意疑问句: 借助情态动词构成附加疑问部分。
如：
This bridge can be built next year, can’t it?
这座桥明年能建成，是吗？
? —Have you finished your project?
—Not yet. I’ll finish it if I _______ ten more
minutes.
A. give B. am given
C. will give D. will be given
B
Practice
Teenagers ________________ to choose their own clothes.
应该允许青少年选择他们自己的服装。
_____ these books _________ out of the reading room?
可以把这些书带出阅览室吗？
When ______ the work __________ ?
这些工作必须什么时候完成？
should be allowed
Can
be taken
must
be finished
Summary
情态动词被动语态：
转变方法
①将主动语态的宾语变成被动语态的主语。
②将含情态动词的主动句式变成被动句式。
特殊疑问句；否定句；反意疑问句。
THANKS