情态动词111.pptVIP

一.情态动词表示推测的用法 巧记表推测的情态动词 肯(can/could)不肯？ 妹（may/might）不问， 妈妈（must）肯定不否问。 She may not be at home. She can’t be at home. They must be there right now. At?this?moment,?our?teacher?must?be? correcting?our?exam?papers. 二.情态动词+have done 一：表示对过去所发生事情的推测 二：表对过去事情的不满或遗憾，带有 较强烈的责备语气 一：表示对过去所发生事情的推测 1. I didn’t hear the phone. I must have been asleep. 1.--Are you coming to Jeff’s party?--I’m not sure. I ____go to the concert instead.(NMET2000) A. must B. would  C. should D. might2.Mary __be in Paris，for I saw her in the town only a few minutes ago． A．mustnt B．cant  C．shouldnt D．may not 3.--_____the news be true?—No, it_____be true.A. Can, can’t B. May, can’t C. May, may not  D. Must, mustn’t 注意:may和might都不用于疑问句中。 二：情态动词+have done表责备(should, need, ought to, could, might) 1. ●When we got to the cinema, the film hadn’t started, so we needn’t have worried. needn’t have done (过去)本来不必做… 2. You could have done better, but you didn’t try your best. could have done (过去) 本能够做， (而实际上未做)。 三.几个情态动词的特定语气 2.（表义务，责任）应该 We should attend the meeting. 5.（用于条件状语从句中）一旦；万一 If she should know the truth, she would be depressed. Should you change your mind, let us know. 6.(用于以lest, for fear that, in case引导的状语从句中）以免， 唯恐 She gave me a list just in case I should forget what to buy. 2.(表义务，必要性，命令）必须 “Must I wash the dishes at once?” “No, you needn’t.” Animals must eat to live. 注意：mustn’t 表示 禁止，不准 You mustn’t play with the knife; you may hurt yourself. 3.(表必然性）必定 Everyone must die. 2.用在否定句、疑问句、感叹句中常表推测、惊讶、怀疑、不相信的语气： 1）— Who can it be? 推测 — It can’t be him. He has gone to Xi’an. 推测 2）How can you be so careless?惊讶 What can he possibly mean?推测 May/Might 1.（表准许，请求）可以… You may go home now, Susan. May I have a word with you? 2.用于目的状语从句中，为了，为了能够 He works hard so that he may get good grades. dare and need T