英语虚拟语气的用法?

语法?

答:虚拟语气是一个比较困难的语法问题。然而只要我们好好总结一下虚拟语气的构成和用法,那就可以化难为易了。现将虚拟语气有关用法归纳如下:
    1.虚拟语气在条件句中的用法
        (1)若表示与现在事实相反的假设,则条件从句中用过去式,主句中用过去将来式(would,should,could,might + 动词原形);若表示某事将来实现的可能性不大,则条件从句中用should + 动词原形也可用“were to+动词原形”或用过去式动词。如:
            I would certainly go if I had time.(现在)
            If it should rain,we wouldn”t go out.(将来)
            If I knew German,I would read the paper to you.(现在)
            If he were here,we could ask him.(现在)
        (2)若表示与过去事实相反的假设,从句中用过去完成式,主句中用过去将来完成式(should,would,could,might + have + 过去分词)。如:
            If I had set off a little earlier, I would have caught the train.
            She would / might have come if she hadn”t been so busy.
            If I hadn”t taken your advice,I would have made a bad mistake.
            If only you hadn”t told him the news.
        (3)含有虚拟语气的条件状语从句中,如有had,should,were 这三个词的话,在正式或书面语言中可将if省略,再将句子的主语和谓语动词实行全部倒装或部分倒装。如:
            Had they time(=If they had time),they would certainly come and help us.
            Should it be fine(=If it should be fine),we would go for an outing.
            Were I go(=If I were you), I would go.
        (4)若主句从句所指的时间不一致,即条件从句表示与过去事实相反,主句表示与现在事实相反;或者条件从句表示与现在事实相反,主句表真实情况,则从句中应采用与具体时间相对应的虚拟形式。如:
            If it had rained last night(过去),It would be very cold today(现在).
            If I had taken your advice(过去),I should have no trouble with the work now(现在).
    2.虚拟语气在宾语从句中的用法
        在动词suggest,order,demand,propose,request,command,insist等后的宾语从句中,用虚拟语气(即Should+动词原形或只用动词原形)来表示愿望、建议、命令、请求等。在动词wish /would rather后的宾语从句中,用过去式表示与现在事实不符,用过去完成式表示与过去事实不符。如:
            I suggest that we(should)set off at once.
            The doctor insisted that the patient (should)be X-rayed.
            I wish I were as strong as you.
            I would rather that you hadn”t told him.
        

3.虚拟语气在主语从句中的用法
        在It is necessary/important/strange/natural;It is requested/suggested/desired/proposed;it is a pity等结构后的主语从句中要用虚拟语气,即Should+动词原形或只用动词原形。如:
            It is necessary that he(should)be sent there at once.
            It is requested that Professor Li(should)give us a speech.
            It is desired that we(should)get everything ready by tonight.
    4.虚拟语气在表语从句、同位语从句中的用法。
        在 suggestion, proposal,idea,plan,order,advice等名词后的表语从句、同位语从句中要用虚拟语气,即should+动词原形或只用动词原形。如:
            Our suggestion is that you( should)be the first to go.
            My advice is that we(should)send for Doctor Li.
            Do you know the order that you(should)keep watch?

5.虚拟语气在其他状语从句中的用法
        在as if引导的状语从句中,用过去式表示与现在事实不符,用过去完成式表示与过去事实不符;在so that,in order that引导的状语从句中,常用should/would/could/might+动词原形来表示虚拟语气。如:
            They talked as if they had been friends for years.
            She stayed at home for a few days so that she could take care of her mother.
            He took a taxi to the station so that she should not miss the train.
    6.虚拟语气在定语从句中的用法:
        在it is time后面的定语从句中常用过去式表示虚拟。
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第1个回答  2012-11-23
英语的动词有三种语气形式,即陈述语气、祈使语气和虚拟语气。陈述语气用来说明事实或就事实提出询问,可用于陈述句、疑问句和某些感叹句中;祈使语气用于表示请求、命令、建议或警告等。
虚拟语气是谓语动词的一种特殊形式,用来表达假设、主观愿望、猜测、建议、可能或空想等非真实情况。如:
He is honest. 他很诚实。 (陈述语气)
Don‘t be late next time. 下次别迟到。 (祈使语气)
If I were you ,I would not go. 我要是你,我就不会去。 (虚拟语气)
I wish I had a lot of money. 要是我有很多很多钱就好了。 (虚拟语气)  
虚拟语气在条件句中的用法:
条件句有真实条件句和虚拟条件句两种。真实条件句所表示的假设是有可能发生的,此时主句不用虚拟语气;而虚拟条件句则表示一种假想,与事实相反或不大可能会发生,此时用虚拟语气。如:
If I have time,I will go. 假若我有时间,我就去。 (陈述语气) If I were you,I would go. 假若我是你,我就去。 (虚拟语气 )

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第2个回答  2012-11-23
这个你直接百度就好了
第3个回答  2020-01-13
虚拟语气的用法是if...,sb/sth
would....,
其中if后面跟动词的过去式,虚拟语气表示的是不可能实现或者与当前实际相反的假设或愿望