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情态动词和现在完成时语法,高中英语情态动词语法讲解

2023-06-21 17:44:50
本内容由小编为大家分享关于招生简章、录取分数、报名考试、志愿填报等教育信息。高考英语语法:情态动词详解  1、情态动词 + have done sth   这个结构有着特殊意义:用来表示猜测(设想可能发生过什么事情)或   想象(设想可能出

本内容由小编为大家分享关于招生简章、录取分数、报名考试、志愿填报等教育信息。

高考英语语法:情态动词详解

  1、情态动词 + have done sth   这个结构有着特殊意义:用来表示猜测(设想可能发生过什么事情)或   想象(设想可能出现过什么不同的情况)   ①should (ought to) have done sth 本来该做而未做   This wall oughtn’t to have been painted blue.   ②need have done sth 本来有必要做而未做   You needn’t have told her the news.   ③must have done sth 对过去所做动作的肯定推测   ---We went to Paris.   ---That must have been nice.   ④can have done sth 对过去所做动作的否定或疑问推测   I don’t think he can have heard you. Call again.   Where can John have put the matches?   ⑤may (might) have done sth 过去可能发生某事,与could相比,may和 might可能性较小,might 可能性更小;might 也可表示过去可能发生而未发生的事情。   Polly’s very late----she may (might) have missed her etrain.   You were stupid to try climbing there. You might have killed youself   ⑥could have done sth   ●推测过去”可能“发生某事 (同can, 但can不用肯定句)   She could have gone off with some friends.   ●表示过去没有实现的可能性:某事可能发生,但却没有发生   You were stupid to go skiing there----you could have broken your leg.   ●表示有能力做而未做(虚拟语气)   You could have helped me !   (You were able to help me, but you didn’t.)   2、can could be able to 表示”能力“   ●can 通常表示现在的或”一般的能力“---即你无论什么时候想做就能   做到的能力, 指单纯的表示一个人有某种能力。   You can certainly cook, even if you can’t do anything else.   ●be able to表示某人通过努力、克服困难做成某事。   will be able to 表示将来的能力   I’ll be able to speak German in another few months.   ●could 表达 ”一般的能力“---即你过去想干什么就可以干什么   She could sing like an angel when she was a kid.   但could 不能表达过去某种具体的能力,此时用was able to, managed to 或 succeeded in 等   How many eggs were you able to get ?   3、can, could, may和might 表示”可能性“   ●可用来表示:①理论上的可能性(不涉及是否真发生);②提出建议   (提出解决某个问题的可能办法或者采取的行动);③在问句或否定句中表达现在的可能性)   Anybody who wants to can become a prison visitor.   ①---What shall we do ?   ---We can try asking Lucy for help. ②   Who can that be at the door ? Can it be Polly?    ③   ●may 可用来表达:①将来的可能性;②说话时某事可能是真实的   We may go climbing this summer.   ①   You may be right.          ②   ●could / might 可用来表示: ①说话时某事可能是真实的;②将来   某事有可能发生,但不表示特别可能发生。   You could be right, but I don’t think you are.  ①   It could rain later on this evening.     ②   4、can, could, may 和might表示“允许”   ①请求允许:它们都可以表示请求允许做某事,could 和 might并不是表示过去   Can (May, Could) I borrow your umbrella ?   ②允许:当我们允许某人做某事时,我们用can和may来表达,而不能使用could和might   You may / can watch TV for as long as you like. (不用could, might; mustn’t 有“拒绝”的意思)   ---Could I use your phone?   ---Yes, of course you can /may. (No, you can’t / may not.)

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标签: 情态 动词 详解