c
3
情态动词的含义
序号 原形
过去式
主要用法
8
be able to was/were able to
“能够”（能力）
9 have to
had to
“不得不/必须”
10 ought to
ought to
“应该”
11 used to
“ 过去（常常）”
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12 had better
13 would
rather
c
8
3.Parents should allow teenagers to drive the car.
Teenagers should be allowed by parents to drive the car .
Should teenagers be allowed by parents to drive the car ?
c
12
3. Sixteen-year-olds should be allowed to drive. (先改为否定句，再改一般疑问句)
Sixteen-year-olds shouldn’t be allowed to drive.
Should sixteen-year-olds be allowed to drive?
含情态动词的被动语态
c
1
情态动词有哪些?
1. can /may/must/ will / shall / should / ought to
2. need /dare 3. had better/ would rather, used to /
have to / be able to
c
2
情态动词的含义
can/could not be done must not be done should not be done may/might not be done had better not be done have not to be done
c
6
疑问式：情态动词+ 主语+ be + p.p
can/could +主语 +be done must +主语 + be done should +主语 + be done may/might +主语 + be done had +主语 + better be done have +主语 + to be done
c
7
1.I can finish the work. The work can be finished by me. Can the work be finished by you?
2.We should plant many more trees. Many more trees should be planted by us. Should many more trees be planted by us?
Fish may be caught in the river (by people).
c
11
1.My mother can cook delicious meals. Delicious meals can be cooked by my mother.
2. Students will use these textbooks next term. These textbooks will be used next term by students .
2.We should answer these questions as soon as
possible.
3.We must clean our classroom this afternoon.
4.You must hand in your homework before nine
o’clock.
3. You should water trees often . Trees should be watered by you often .
4.You must not plant trees in very dry earth . Trees must not be planted by you in very dry earth.
Yes they should./ No, they shouldn’t.
4. 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.
c
13
Drills:
1.We should look after elder people very well.
4.You can pass the exam if you study hard.
The exam can be passed (by you) if you study hard.
Can the exam be passed (by you) if you study hard?
c
9
water(浇水)
They must water trees every day. Trees must be watered by them every day. Must trees be watered by them every day?
c
10
People may catch fish in the river.
序号 原形 过去式
主要含义
1
can
2 may
could 1.能力2.请求/准许3.可能性 might 1.请求/准许2.可能性 *3.祝愿
3 must
must 1.义务(必须); 2.猜测(肯定)
had to
4 need needed
需要
5 dare
dared
敢
6
will
would
愿意
7 shall should 1.征求意见 2“应该”(should)
c
“最好” “ 宁愿”
4
含情态动词的被动语态： 情态动词+be +PP
can/could be done
must be done
should be done
may/might be done
had better be done
have to bec done
5
否定式：情态动词+not + be + p.p