概要： He can't be in the room, is he? He must have finished the work, hasn't he? He may have done the work last night, didn't he? :情态动词+行为动词进行式 情态动词+行为动词进行式(即情态动词+ be + v-ing形式),表示推测或评论某动作现在是否正在进行。例如: 1)He must be playing basketball in the room. 2)She may be staying at home. 三、情态动词+行为动词完成进行式 情态动词+行为动词完成进行式(即情态动词+ have been + v-ing 形式),表示推测或评论过去某动作是否正在进行或一直在进行。例如: 1)They should have been meeting to discuss the problem. 2)He may /
八年级英语上学期Unit 11语法解析,标签：八年级上册英语教案,人教八年级英语教案,http://www.67jx.comHe can't be in the room, is he?
He must have finished the work, hasn't he?
He may have done the work last night, didn't he?
:情态动词+行为动词进行式
情态动词+行为动词进行式(即情态动词+ be + v-ing形式),表示推测或评论某动作现在是否正在进行。例如:
1)He must be playing basketball in the room.
2)She may be staying at home.
三、情态动词+行为动词完成进行式
情态动词+行为动词完成进行式(即情态动词+ have been + v-ing 形式),表示推测或评论过去某动作是否正在进行或一直在进行。例如:
1)They should have been meeting to discuss the problem.
2)He may / might have been buying stamps in the post office when you saw him.
某些情态动词的特殊用法
1.used to +v, be used to +v-ing和be used to +v
(1)used to +v意为"过去常常","过去一直";be used to +v-ing / n(名词)意为"习惯于";be used to +v意为"被用来(做某事)"。
(2)used to只表示过去,而be used to +v-ing / n可表示现在、过去或将来。例如:
1)He used to smoke. Now he doesn't.
2)He's quite used to hard work / working hard.
3)The knife is used to cut bread.
2.用作情态动词的其他短语
would rather, would sooner, would (just) as soon, had rather, had better, had sooner, can not but, may (just) as well等可用作情态动词。例如:
1)The soldier would sooner die than surrender.
2)The brave soldier would as soon die as yield to such an enemy.
3)I'd rather walk than take a bus.
4)If you don't like to swim, you may just as well stay at home.
注:这些短语后一般直接跟动词原形.would (had) rather, would (had) sooner, would (just) as soon后可跟that 引导的从句,that 常省去,从句要用虚拟语气。对现在和将来的假设用过去时,对过去的假设用过去完成时。例如:
1)I would rather you came on Sunday.
2)I would sooner you hadn't asked me to speak yesterday.
二、动词不定式、动名词用法
⒈不定式作主语
动词不定式作主语时,句子的谓语动词常用单数,其位置有以下两种:
(1)把不定式置于句首。如:
To get there by bike will take us half an hour.
(2)用it作形式主语,把真正的主语不定式置于句后,常用于下列句式中。如:
①It+be+名词+to do
It's our duty to take good care of the old.
②It takes sb+some time+to do
How long did it take you to finish the work?
③It+be+形容词+for sb+to do
It is difficult for us to finish writing the composition in a quarter of an hour.
④It+be+形容词+of sb+to do
It is stupid of you to write down everything the teacher says.
⑤It seems(appears)+形容词+to do
It seemed impossible to save money.
在句型③中,常用表示客观情况的形容词,如:difficult, easy, hard, important, impossible, necessary 等;在句型④中,常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise等 表示赞扬或批评的词。在不定式前的sb,可看作其逻辑主语。这一句式有时相当于Sb is+形容词+to do句式 ,如:It's kind of you to help me with my English.=You are kind to help me with my English.
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