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1、虚拟语气之假设语气英语虚拟语气主要分以下几类：1假设句，以if最为常见。2表达某事应该怎么样，比如HesuggeststhatIshouldcomeearly.3表达某种强烈愿望，比如wish之后的宾语从句，ifonly等。假设语气主要用于if引导的条件句中，表达的是非真实的或不太可能的假设与结果。其从句（if假设句）和主句（假设的结果）要用特殊的动词时态。下面先看下真实条件句与假设条件句的区别：IfIbecomepresident,Iwill…(奥巴马竞选总统时所说)IfIbecamepresident,I’d…(一个小男孩所说，不太可能的情况所以用假设语气)I
2、fIwinthisrace,Iwill…(刘翔所说)IfIwonthisrace,I’d…(最慢的运动员所说，不太可能的情形，所以用假设语气)一．分别对过去、现在和未来的假设1、过去发生事情进行假设这时从句动词用haddone，主句用would/should/could/might+havedoneIfyouhadworkedharder,youwouldhavepassedyourexam.Ifyouhadaskedme,Iwouldhavetoldyou.IwouldhavebeeninbadtroubleifJanehadn’thelpedme.Ifitha
3、dn’tbeenforyourhelp,wecouldhavebeeninlotsoftrouble.(要不是你的帮助，我们要陷入很大的麻烦)2、对现在情形进行假设这时从句用did和were（be动词都改成were），主句为wouldshould/could/might+doIfIknewhername,Iwouldtellyou.Iwouldperfectlyhappy,ifIhadacar.IfIwererich，Iwouldspendallmytimetraveling.IfmynosewerealittleshorterI’dbequitepretty.I
4、fitweren’tforthechildren,wecouldgoskiing.要不是孩子们的原因，我们就会去滑雪3、对将来情形假设这时从句有以下三种动词形式1.were/did2.wereto3.should主句为would/should/could/might+do看看下面的例子WhatwouldIdoifIweretolose/shouldlose/lostmyjob？Ifyouweretomoveyourchairabit,wecouldallsitdown.ifitshouldrain/weretorain/rainedtomorrow,Iwouldn
5、otgoout.Iftheyshouldplay/weretoplay/playedbetternexttime,theywouldnotfailagain现在我们对这三种情况用图表进行总结假设情形假设句（if从句）结果句（主句）过去haddonewould/should/might/could+havedone现在did/werewould/should/might/could+do将来did/wereweretodoshoulddowould/should/might/could+do上述主句中would最为常用，might=wouldperhaps/woul
6、dpossibly表可能如Ifyouaskedmenicely,Imightbuyyouadrink.could=wouldbeableto表能力如IfIhadanother$500,Icouldbuyacar.二、Ifitweren’tfor…和Ithadn’tbeenfor…Ifitweren’tfor…和Ifithadn’tbeenfor…，其意为“若不是(有)”“要不是”。如： Ifitweren’tforwater,noplantcouldgrow.要是没有水植物就无法生长。 Ifithadn’tbeenforyourassistance,wewou
7、ldn’thavesucceeded. =Butforyourassistance,wewouldn’thavesucceeded. =Withoutyourassistance,wewouldn’thavesucceeded.三、含蓄条件句有些句子中虽然没有出现if，但因为butfor（要不是），otherwise（否则）等词也暗含着假设，所以要用if假设句的主句动词形式。如：Hewouldhavegivenyoumorehelp,buthewastoobusy 他本来会给你更多的帮助，但是他太忙了。也就是说，如果那时他不忙，他可以给你更多的帮助。句中bu
8、thewa
