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首页 > 教案下载 > 英语教案 > 高中英语教案 > 高三英语教案 > 2019年高考英语二轮专题复习6情态动词和虚拟语气

2019年高考英语二轮专题复习6情态动词和虚拟语气

发布时间:2019-11-12

10.情态动词+have done的用法
①could+have done:本可以做而实际上未能做
    you could have done better, but you didn’t try your best.
②cannot+have done:表示对过去行为的否定推测
    he cannot have been to that town.
③can+主语+have done:表示对过去行为的怀疑或不肯定
can he have got the book?
④might(may)+ have done:对过去发生的行为不太肯定的推测
he may not have finished the work.
if we had taken the other road, we might have arrived earlier.
(mood:might>may,possibility:might<may)
⑤must+have done:对过去发生的行为肯定的推测。其否定式为:cannot have done
you must have seen the film.
you cannot have seen the film.
⑥needn’t+have done:本来不必要做的而实际上又做了
you needn’t have watered the flowers,for it is going to rain.
注意:didn’t need to(have to)do :没有必要做而实际上也没有做
i didn’t need to clean the windows.my sister did it 2 hours ago.
⑦should(ought to)+ have done:本来应该做而实际上又没有做。
其否定形式表示某种行为不该发生却发生了。
    you should have started earlier, but you didn’t.
    she shouldn’t have taken away my measuring tape, for i wanted to use it.
    注意:本结构还可以表“推测”的意思
he should have finished the work by now.
到现在他应该已经做完那项工作了。
11.其它情态动词
    ①have to
have to表示 “必须, 不得不”, 在这个意义上与must很接近, 但must表示的是说话人的主观看法, 而
have to表示的却是客观需要. have to比must有更多的形式。
the tv set is broken. i have to buy a new one.
the students will have to know how to use the computers.
注意:在回答must的问句时, 否定式常用need not(needn’t)或don’t have to表示 “不必”。而不用
must not, 因为must not表示 “不可以”。
   ②used to
表示过去的习惯动作或状态(现在已不复如此)
—did you use to go there to see your brother? /used you to go there to see your brother?
—yes, i did(used to). /no , i didn’t (usedn’t).
注意:would也可表示过去反复发生的动作或某种倾向,但是不涉及到现在。
③had better
表示 “最好(做……)”
we had better go now. 
     其否定式为had better not
ii.虚拟语气
(一)一般虚拟结构   
类别 用法 例句
if引导的条件从句 与现在事实相反 从句动词:过去式(be用were)
主句动词:should/would/could/might+动词原形 if he were here, he would help us.
 与过去事实相反 从句动词:had+过去分词
主句动词:should/would/could/might+have+过去分词 if i had been free, i would have visited you.
 与将来事实相反 从句动词:过去式 / should+动词原形 / were+不定式
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