did的用法小结.doc

did的用法小结 今天给大家整理了did用法，快来一起学习吧，下面就和大家分享，来欣赏一下吧。【英语语法】did的用法1. 到底何时使用did?did和其它助动词一样，本身无意义，自己不能独立作谓语，只能和其它主要动词一起构成谓语，用于构成一般过去时的否定句和疑问句，当然也常常用于代替上文中的行为动词的过去式。如:I didnt go to school last Sunday. 上周日我没上学。Did you buy a new pen yesterday? 昨天你买了枝新钢笔吗?2. did身后的动词到底用什么形式?有的小朋友总不注意did身后的动词用什么形式，在否定句和疑问句中，did身后的动词必须用原形。 “他昨天没有在家吃午饭。”误 He didnt had lunch at home yesterday.正 He didnt have lunch at home yesterday.3. 我能用be动词代替吗?不管怎么说，含有行为(实义)动词的一般过去时的肯定句变成否定句或疑问句时，不能用be动词，必须用到did!含be动词的句子构成否定句或疑问句都绝不会让did露面!例句：They went to the park last week. (改为否定句)误 They werent go to the park last week.正 They didnt go to the park last week.助动词do/does/did的用法1、放在句首构成一般疑问句，例如：Do you want to go there? 你想去那里吗?Does he like English? 他喜欢英语吗?Did you see him yesterday? 你昨天看见他了吗?2、构成否定句do/does/did + not，例如：I do not want to stay here 我不想呆在这里。He doesnt like this book. 他不喜欢这本书。Tom did not go to school yesterday. 汤姆昨天没去上学。3、句首加Dont构成否定祈使句，例如：Dont go there. 不要去那里。Dont be so silly. 不要这么傻了。注：此处只能用Dont.4、放在动词原形前，加强该动词的语气，例如：Do come to my family. 一定要来我家。I did go there yesterday. 我昨天确实去那儿了。I do miss you. 我确实想你。5、用于倒装句，例如：Never did I hear of such a place. 我从未听说过这样一个地方。Only when we come here do we know the beauty of the village.只有当我们来到这里才知道这个村庄的美。注：引导此类倒装句的副词有never, seldom,rarely, little, only, so, well等。6、可以用作代动词，例如：Do you like Shanghai? -你喜欢上海吗?Yes, I do. 是的，我喜欢。(do用作代动词，代替like Shanghai.)Does he like music? 他喜欢音乐吗?Yes, he does.是的，他喜欢。(does用作代动词，代替likes music)may 和might1、may的用法(1)表示询问或说明一件事可不可以做。(2)表示一件事或许会发生或某种情况可能会存在，通常用在肯定句和否定句中。注意：表示可能性时，cant语气强，表示“不可能”，may not语气弱，表示“可能不”。2、might的用法(1)表示询问或允许，指的是过去时间。(2)表示可能发生的事，可以指过去时间，也可以指现在时间，语气更加不肯定，可能性比may小一些。3、may与might的特殊用法(1)“may+主语+动词原形”表示祝愿。(2)“may/ might well+动词原形”表示(完全)能，很可能。(3)“may/ might as well+动词原形”表示最好，满可以，倒不如。(4)may be 是“情态动词+系动词be”结构，表示“可能有，可能在”，否定式为may not be。maybe是一个词，为副词，意为“大概，或许，可能”，在句中作状语。情态动词+ have +过去分词1) may(might) have + done sth, can (could) have + done sth表示过去，推测过去时间里可能发生的事情。Philip may (might) have been hurt seriously in the car accident.Philip can (could) have been hurt seriously in the car accident.2) must have +done sth，对过去时间里可能发生的事情的推测，语气较强，具有"肯定"，"谅必"的意思。-Linda has gone to work, but her bicycle is still here.-She must have gone by bus.3) ought to have done sth, should have done sth本应该做某事，而事实上并没有做。否定句表示"不该做某事而做了"。You ought to (should) have been more careful in this experiment.He ought not to have thrown the old clothes away.(事实上已扔了。)ought to 在语气上比should 要强。4) neednt have done sth 本没必要做某事I dressed very warmly for the trip, but Ineednt have done so. The weather was hot.5) would like to have done sth 本打算做某事I would like to have read the article, but I was very busy then.should 和ought toshould 和ought to 都为"应该"的意思，可用于各种人称。-Ought he to go?-Yes. I think he ought to.表示要求，命令时，语气由 should(应该)、had better最好)、must(必须)渐强。did的用法小结