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高三英语情态动词知识要点

高三英语情态动词知识要点

高考英语情态动词要点如下:

一、情态动词的基本用法

1.must和have to两者都表示“必须”的意思,但是mu。t含有说话入主观上的看法和态度,表示主观的义务和必要,主要用于肯定句和疑问句,意思为“必须,得,要,”;由muslsquo;引起的疑问句,肯定回答要用must或h。ve to,否定回答要用needn’t或don’t have to,意思是“不必”;must的否定形式mustn’t表示禁止,意思是“不能,不许”;haveto则表示客观上的需要,意思是“不得

不”.have to的否定形式是don’t have to,相当于needn,t。

①Mother out, so Ilook after the shop.

妈妈不在家,因此我不得不照看商店。

②You~see the doctor,Joe You don,t lookvery well.乔,你必须去看医生,你看上去不是太好。

2.can和could

(1)在日常会话中表示“许可,容许”时,常用can;当请求得到许可时,常用could,较为礼貌,而不用can。

①Yougo now.你现在可以走了。

②____I borrow your caf?我可以借你的车吗?

(2)can用来表示有能力做某事;could多用于表示某人在某时期之内拥有的能力。

1____ swim when l was eight.

(3)can用于询问某事是否可能,还通常用来表示某事是不可能的;could多用于疑问。

①That____be true 那不可能是真的。

②____ that really be true?那件事真的是那样吗?

3.shall和shouldshall用于第二和第三人称的肯定句或否定句中表示说话人给予对方“禁止、命令、警告、允诺或威胁”等;用于第一和第三人称疑问句中时表示征求对方的意见。

should用来表示建议、责任和义务时,意为“应该、应当”,此时可用ought to替换;用于疑问句中时表示惊讶、忧虑和感叹等不满的情绪。

①____ we clean the classroom now?现在我们可以打扫教室吗?

②You____answer my question in English.你应当用英语回答我的问题。

4. had better和would ratherhad better意思为“最好做某事”,否定式为had betternot; would rather意思为“宁愿”,否定式为would rather not。

①If Jack is as sick as you say, he-__go home 如果杰克像你所说的那样病得很重,他最好回家。

②1_ ___ stay here than go home.我宁愿待在这里也不愿意回家。

二、情态动词表达推测

1.对现在或将来的推测用“情态动词十动词原形”

肯定的推测一般用must,should,may( might)或can(could),其中must的语气最强,意为“肯定”“准是”“想必是”;should的语气其次,意为“很可能“应该”,指按常理推测;may( might),can( could)语气最弱,意为“有时会”

“也许”“可能”。

否定推测分为两种情况:语气不很肯定时,常用couldn’t,may not,might not意为“可能不”“也许不”;否定语气最强时,则可以用can’t,意为“根本不可

能”“一定不能”,表示吃惊或怀疑。

2.对过去发生事情的推测,用“情态动词十完成式”

(1)“should/ought to+have+done”表示本应该做某事而实际上没有做,其否定式表示某种行为不该发生却发生了。

①You are late again You____(come) here earlier.

②You____(refuse) her at the beginning, butnow

it is too late.

(2)shouldn’t/ought not to+have done”表示不应该做而实际上做了。

I am feeling sick; I___(eat) so much chocolate

(3) could+have+done”表示本来能够做但事实上没有做。

-A taxi wasn’t at all necessary, it is so near.

-Yes, we____ (walk) to the station

(4) could n’t+have done”表示对过去的推测或本来不能够做但实际上却做了。

I saw Mr. Wang just now,sohe _(go) to I3eijing

(5)needn’t+have done”表示没有必要做而实际上做了。

You____(water) the flowers, for it is going to rain

(6) must+have done”表示对过去事实的肯定猜测。

①The light in our classroom is stil l on, and the studentswho left last__ _(forget) to turn it off.

②He_ (drink) to say that.

(7) may/might+have done”表示对过去已经发生行为的推测,意为“也许,或许”,一般只用于肯定句和否定句,不用于疑问句,might的语气比may要弱。

①It is too late l think he _(go) to bed.

②She (catch)a cold.

参考答案

-.1.①have to ~must2. (l)①can CD(}ould

(2)couldc3)① can’t ~Could3.①Shall②should4. CDhad better ~would rather

二.2. (1)① should have come ‘ ②ought to haverefused(2)shouldn’t have eaten(3) could have walked(4) couldn’t have gone( 5) needn’t have

wa tered(6)① must have forgotten ② must have been drunk(7)① may have gone ② might have caught 总结高考英语情态动词要点就为大家整理到这里了,希望大家在高三期间好好复习,为高考做准备,大家加油。

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