语法专题 专题七 虚拟语气
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表示经过一番努力，终于能够完成某事。 Her mother can speak French.
The wounded man was still able to get to the village and was
saved by the villagers in the end.
(2)表示猜测“可能”，一般用于疑问句和否定句。
2.—I left my handbag on the train，but luckily someone
gave it to a railway official. might —How unbelievable to get it back! I mean，someone _____ have stolen it.
so much.
4.The police still haven’t found the lost child，but they’re
doing all they can . 5.You can’t be too careful when driving.
2.may和might的用法 (1)表示允许、请求，might比may的语言更委婉一些。 —May I watch TV now? —Yes，you may.(Yes，please.)
1
情态动词的考查要点
1.can，be able to 和could
(1)can和be able to都表示能力，意思上没多大区别。但can
只有现在和过去时，而be able to则有更多的形式。但当成
功地完成某一具体动作时，通常不用could而用was/were
able to来表示。这时was/were able to 相当于managed to，
I can but wait.
I can’t but wait.
You can’t be too patient to the customers.
题组训练1
用can，could，be able to的适当形式填空 1.Though the building was on fire，they were able to go out
safely.
2.It can’t be the postman at the door. It’s only six o’clock.
3.—How’s your new babysitter?
—We
could
not ask for a better one. All our kids love her
句或感叹句中)。
How can that be true？I can’t believe my eyes and ears.
How could you be so careless?
(6)can的特殊用法。 can but只有；can’t but不得不；can’t...too再怎样也 不为过，越……越好
(1)must表示“必须，应该，一定要”。强调主观看法，只
有现在时形式，否定式是must not(mustn’t)。must开头的
问句，其否定回答要用needn’t或don’t have to代替。
(2)must表示必然的结果。
All men must die.
(3)must还可表示主语固执、偏要做他人不希望做的事。 It can’t help；he must do that.
(4)表示请求、允许(表请求时，口语中常用could代替can使语
气更委婉，回答时用can)。
Can I go now?
—Could I come to see you tomorrow?
—Yes，you can.(否定答语可用No，I’m afraid not.)
(5)表示惊异、怀疑、不相信的态度(主要用于否定句、疑问
(4)may/might as well最好还是……，不妨
You might as well do it now. (5)may/might well很可能
He may well be late for class.
题组训练2 用may，might的适当形式填空
1.—I don’t really like James. Why did you invite him? —Don’t worry. He might/may not come. He said he wasn’t certain what his plans were.
3.As a student，you might/may as well make good use
of your time.
4.You 5. May
may
go to school either by bike or by bus.
she rest in peace.
3.must，have to和ought to的用法
—No，you mustn’t.(No，you’d better not.)
(2)表示可能性时，might比may的可能性小，may表示的可能性
比can小(主要用于陈述句、肯定或否定句，疑问句用can代替)。
The story may not be true.
(3)表示祝愿(不用might)
May you succeed!
—Can the news be true?
—It can’t be true.
Someone is knocking at the door.Who could it be?
(3)can可以表示理论上的可能性，指常有的行为或情形，意
为“有时会……”。
Anybody can make mistakes.
ቤተ መጻሕፍቲ ባይዱ
(4)have to着重客观需要，能用于更多时态(过去时或将来时)。
He will have to be there before ten.
(5)ought to表示义务和责任，“应该”，比should语气要强。 You ought to take care of yourself. 4.need和dare的用法 (1)need表示“需要，必要”，只能用于否定句和疑问句。 在肯定句中，常用must和have to代替。
The wounded man was still able to get to the village and was
saved by the villagers in the end.
(2)表示猜测“可能”，一般用于疑问句和否定句。
2.—I left my handbag on the train，but luckily someone
gave it to a railway official. might —How unbelievable to get it back! I mean，someone _____ have stolen it.
so much.
4.The police still haven’t found the lost child，but they’re
doing all they can . 5.You can’t be too careful when driving.
2.may和might的用法 (1)表示允许、请求，might比may的语言更委婉一些。 —May I watch TV now? —Yes，you may.(Yes，please.)
1
情态动词的考查要点
1.can，be able to 和could
(1)can和be able to都表示能力，意思上没多大区别。但can
只有现在和过去时，而be able to则有更多的形式。但当成
功地完成某一具体动作时，通常不用could而用was/were
able to来表示。这时was/were able to 相当于managed to，
I can but wait.
I can’t but wait.
You can’t be too patient to the customers.
题组训练1
用can，could，be able to的适当形式填空 1.Though the building was on fire，they were able to go out
safely.
2.It can’t be the postman at the door. It’s only six o’clock.
3.—How’s your new babysitter?
—We
could
not ask for a better one. All our kids love her
句或感叹句中)。
How can that be true？I can’t believe my eyes and ears.
How could you be so careless?
(6)can的特殊用法。 can but只有；can’t but不得不；can’t...too再怎样也 不为过，越……越好
(1)must表示“必须，应该，一定要”。强调主观看法，只
有现在时形式，否定式是must not(mustn’t)。must开头的
问句，其否定回答要用needn’t或don’t have to代替。
(2)must表示必然的结果。
All men must die.
(3)must还可表示主语固执、偏要做他人不希望做的事。 It can’t help；he must do that.
(4)表示请求、允许(表请求时，口语中常用could代替can使语
气更委婉，回答时用can)。
Can I go now?
—Could I come to see you tomorrow?
—Yes，you can.(否定答语可用No，I’m afraid not.)
(5)表示惊异、怀疑、不相信的态度(主要用于否定句、疑问
(4)may/might as well最好还是……，不妨
You might as well do it now. (5)may/might well很可能
He may well be late for class.
题组训练2 用may，might的适当形式填空
1.—I don’t really like James. Why did you invite him? —Don’t worry. He might/may not come. He said he wasn’t certain what his plans were.
3.As a student，you might/may as well make good use
of your time.
4.You 5. May
may
go to school either by bike or by bus.
she rest in peace.
3.must，have to和ought to的用法
—No，you mustn’t.(No，you’d better not.)
(2)表示可能性时，might比may的可能性小，may表示的可能性
比can小(主要用于陈述句、肯定或否定句，疑问句用can代替)。
The story may not be true.
(3)表示祝愿(不用might)
May you succeed!
—Can the news be true?
—It can’t be true.
Someone is knocking at the door.Who could it be?
(3)can可以表示理论上的可能性，指常有的行为或情形，意
为“有时会……”。
Anybody can make mistakes.
ቤተ መጻሕፍቲ ባይዱ
(4)have to着重客观需要，能用于更多时态(过去时或将来时)。
He will have to be there before ten.
(5)ought to表示义务和责任，“应该”，比should语气要强。 You ought to take care of yourself. 4.need和dare的用法 (1)need表示“需要，必要”，只能用于否定句和疑问句。 在肯定句中，常用must和have to代替。