情态动词及情态动词的被动语态.ppt

含情态动词的被动语态
2
情态动词有哪些?
can /may/must/ will / shall / should / ought to
need /dare
had better/ would rather, used to / have to / be able to
3
情态动词的含义
序号
原形
过去式
主要含义
1
can
could
2
may
might
3
must
must
had to
4
need
needed
5
dare
dared
6
will
would
7
shall
should

*
(必须); (肯定)
需要
敢
愿意
2“应该”(should)
4
序号
原形
过去式
主要用法
8
be able to
was/were able to
9
have to
had to
10
ought to
ought to
11
used to
12
had better
13
would rather
“能够”(能力)
“不得不/必须”
“应该”
“过去(常常)”
“最好”
“宁愿”
情态动词的含义
can/could be done
must be done
should be done
may/might be done
had better be done
have to be done
含情态动词的被动语态:
情态动词+be +PP
否定式:情态动词+not + be +
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
疑问式:情态动词+ 主语+ be +
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
can finish the work.
The work can be finished by me.
Can the work be finished by you?
should plant many more trees.
Many more trees should be planted by us.
Should many more trees be planted by us?
Teenagers should be allowed by parents to drive the car .
should allow teenagers to drive the car.
Should teenagers be allowed by parents to drive the car ?
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?
water(浇水)
Trees must be watered by them every day.
They must water trees every day.
Must trees be watered by them every day?