站内资源搜索: ?????? 进入云平台→
 
设为首页????·????加入收藏????·????English

累计访问:4066573??此刻在线:131
 
◆?教研频道?◆
?最新 5 条
高二英语语法:倒装
高二英语语法:强调句
情态动词讲义
高一英语组教案
高一英语组教案
?最火 5 条
喜讯
美丽英文欣赏2
高三英语寒假作业…
高三英语研讨课m…
m9 u4 re…
 
当前位置:首页?>>?教研频道?>>?英语组
情态动词讲义
作者:高一英语组??日期/时间:2018/6/24 22:51:00??点击:723??我要评论

??????

高一英语情态动词语法讲义

一、???????????? 情态动词的用法和意义

1 cancould的用法
1. 表示能力或客观可能性,还可以表示请求和允许。如:
can you finish this work tonight?
man cannot live without air.
— can i go now??? — yes, you can.
注意:could也可表示请求,预期委婉,主要用于疑问句,不可用于肯定句,答语应用can(即could不能用于现在时态的简略答语中)。如:
?? could i come to see you tomorrow?
?? yes, you can.
(否定答语可用no, im afraid not.
?????
can表示能力时,还可用be able to代替。如:
?? ill not be able to come this afternoon.
2.
表示惊异、怀疑、不相信的态度。(主要用在否定句、疑问句或惊叹句中)
can this be true?
how can you be so careless!
this cannot be done by him.

2 maymight的用法
1. 表示许可。
表示请求、允许时,mightmany的语气更委婉一些,否定回答时要用mustnt表示不可以禁止阻止之意。如:
you may drive the car.
— might i use your pen??? — no, you mustnt.
may i ... 征询对方许可在文体上比较正式,在口气上比较客气。在日常口语中,用can i ... 征询对方意见在现代口语中更为常见。
2.
用于祈使句中表示祝愿。如:
may you succeed!
3.
表示推测、可能(疑问句不能用于此意)。
he may be very busy now.

3 musthave to的用法
1. 表示必须、必要。如:
you must come in time.
回答must引出的问句时,如果是否定的回答,不能用mustnt,而要用needntdont have to
— must we hand in our exercise books today?
— yes, you must. (no, you don’t have to.)
2. “must be +
表语的结构表示推测,它的否定或疑问式用can代替must
?? this must be your pen.
3. have to
的含义与must相似,两者往往可以互换使用,但have to有各种形式,随have的变化而定。musthave to有下列几点不同:
must表示的是说话人的主观看法,而have to则往往强调客观需要。如:
the play is not interesting. i really must go now.
i had to work when i was your age.
must一般只表现在,have则有更多的时态形式。
二者的否定意义不大相同。如:
you mustnt go.
你可不要去。
you dont have to go.
你不必去。
询问对方的意愿时应用must。如:
must i clean all the room?

4 dareneed的用法
1. need表示需要必须,作情态动词时,仅用于否定句或疑问句中,在肯定句中一般用must, have to, ought to,should代替。如:
you needn’t come so early.
— need i finish the work today?
— yes, you must.
注意:neednt + 不定式的完成式表示本来不必做某事而实际上做了某事。如:
you neednt have waited for me.
2. dare
作情态动词时,主要用于疑问句、否定句和条件从句中,一般不用在肯定句中。如:
how dare you say im unfair.
he darent speak english before such a crowd, dare he?
3. dare
need常用作实义动词,有时态、人称和数的变化,所不同的是,作实义动词时,在肯定句中,dare后面通常接带to的不定式,在否定和疑问句中,dare后面可接带to或不带to的不定式。如:
i dare to swim across this river.
he does not dare (to) answer.
dont you dare (to) touch it!
i wondered he dare (to) say that.
he needs to finish it this evening.

5 shallshould的用法
1. shall用于第一、第三人称疑问句中,表示说话人征求对方的意见或向对方请示。如:
shall we begin our lesson?
when shall he be able to leave the hospital?
2. shall
用于第二、第三人称,表示说话人给对方命令、警告、允诺或威胁。如:
you shall fail if you dont work harder.
(警告)
he shall have the book when i finish reading.
(允诺)
he shall be punished.
(威胁)
4. should
表示劝告、建议、命令,其同义词是ought to;在疑问句中,通常用should代替ought to。如:
you should go to class right away.
should i open the window?
should
的含义较多,用法较活,现介绍三种其特殊用法。请看下面的句子:
i should think it would be better to try it again. 我倒是认为最好再试一试。
you are mistaken, i should say. 依我看,你是搞错了。
i should advise you not to do that. 我倒是劝你别这样做。
this is something i should have liked to ask you. 这是我本来想问你的。
从以上例句可以看出:情态动词should用于第一人称时可以表示说话人的一种谦逊、客气、委婉的语气。
should
还可以用在if引导的条件从句,表示一件事听起来可能性很小,但也不是完全没有可能。相当于万一的意思。从句谓语由should加动词原形构成,主句谓语却不一定用虚拟语气。如:
ask her to ring me up if you should see her. 你万一见到她,请让她给我打个电话。
if you should change your mind, please let us know. 万一你改变主意,请通知我们。
should i (if i should) be free tomorrow i will come. 万一我明天有时间,我就来。
此外,why(or how) + should结构表示说话人对某事不能理解,感到意外、惊异等意思。意为竟会。如:
why should you be so late today? 你几天怎么来得这么晚?
— where is betty living? — 贝蒂住在哪里?
— how should i know? —
我怎么会知道呢?
i dont know why you should think that i did it. 我真不知道你凭什么认为这件事是我干的。

6 willwould的用法
1. 表示请求、建议等,wouldwill委婉客气。如:
would you pass me the book?
2.
表示意志、愿望和决心。如:
i will never do that again.
they asked if we would do that again.
3. would
可表示过去反复发生的动作或某中倾向。would表过去习惯时比used to正式,并没有现已无此习惯的含义。如:
the wound would not heal.
during the vacation he would visit me every week.
4.
表料想或猜想。如:
it would be about ten when he left home.
what would she be doing there?
i thought he would have told you all about it.

7 ought to的用法
1. ought to
表示应该。如:
you ought to take care of him.
2.
表示推测。注意与must表示推测时的区别:
he must be at home by now.
(断定他已到家)
he ought to be home by now.
(不十分肯定)
this is where the oil must be.
(比较直率)
this is where the oil ought to be.
(比较含蓄)
注意:在美国英语中,ought to用于否定句和疑问句时,to可以省略。如:
ought you smoke so much?
you oughtnt smoke so much.

8 used tohad betterwould rather的用法
1. used to表示过去的习惯动作或状态,现在已不存在,在间接引语中,其形式可不变。如:
he told us he used to play football when he was young.
在疑问句、否定句、否定疑问句或强调句中,可有两种形式:
疑问句
did you use to go to the same school as your brother?
used you to go to the same school as your brother?
否定句
i usednt to go there.
i didnt use to go there.
usednt
亦可拼作usent,但发音皆为[ju:znt]
否定疑问句
usent you to be interested in the theatre?
?didnt you use to be interested in the theatre?
强调句
i certainly used to smoke, but it was a long time ago.
?i certainly did use to smoke, but it was a long time ago.
其反意疑问句或简略回答中,也有两种形式:
she used to be very fat, didnt she?
(正式)/ use(d)nt she? (口语)
did you use to play chess? yes, i did.
used you to get up early in the morning? yes, i did. (yes, i used to.)
2. had better
意为最好,后接不带to的不定式。如:
— we had better go now.
— yes, we had (wed better / we had better).
hadnt we better stop now? (had we better not stop now?)
i think id better be going.
(用于进行时态,表最好立即
you had better have done that.
(用于完成时态,表未完成动作)
注:had besthad better同意,但较少用。you had better … 用于同辈或小辈,对长辈不可用。
3. would rather
意为宁愿,表选择,后接不带to的不定式。如:
id rather not say anything.
would you rather work on a farm?
— wouldnt you rather stay here?
— no, i would not. id rather go there.
由于would rather表选择,因而后可接than。如:
i would rather work on a farm than in a factory.
i would rather watch tv than go to see the film.
i would rather lose a dozen cherry trees than that you should tell me one lie.
id rather you didnt talk about this to anyone.
(句中的d rather不是情态动词,would在此是表愿望的实义动词)

发表评论
版权页
版权所有:?ag线下网投|官方 校址:江苏省泰兴市济川街道鼓楼东路68号
电话:0523-87622031 传真:0523-87626261 信箱:stxzx1861@163.com 备案证书号:苏ICP备05003324号-1