初中现在完成时探讨.ppt

have/has been to have/has gone to have/has been in 去过 常与ever, never, once,twice,连用 在… 与时间段连用 用how long 提问 去了 说话时某人不在 只用于第三人称 A: _____ you ever ________ the city ? B: No , never . Have been to ?与一般过去时的用法比较 一.现在完成时和一般过去时都是说过去的事情，但现在完成时注意的不是事情本身，而是强调事情与现在保持的某种密切联系（如现在的结果，影响,一直延续到现在等）; 而一般过去时，则只讲述发生在过去的动作和事情与现在没有关系。 上一页 下一页 主菜单 eg：1.He has bought an English-Chinese dictionary. 他已经买了一本英汉字典。 2.He bought an English-Chinese dictionary. 他曾买过一本英汉字典。 ? 第一句用现在完成时时态，想表达意为：“He bought an English-Chinese dictionary. And he still has it” “过去他买了一本英汉字典，现在他还有这本字典” 。 ?第二句用过去时只叙述过去他买过一本英汉字典这一事实，至于现在他是否有这本字典并未强 调说明。 二．当有一个表示过去某一特定时间的状语时，不用现在完成时，而用一般过去时: eg: 1. I____(see) the film on television yesterday . 但since(自…以来)+某一过去时间或叙述过去事情的从句总是与现在完成时连用。 eg： 2.They__________(know)each other since 1950 . 3.Since he was a child ,he________(live) in England. saw have known has lived Welcome 1. May the joy and happiness around you today and always! 愿快乐幸福永伴您左右! 2.Good luck and great success every year! 祝每年好运，并取得更大的成功! 下一页 袁淑情 概念 基本结构 基本句型变化（一般疑问句，否定句，特殊疑问句） 关键词（already, yet, since, for, so far, just,） He is full . He has had a big breakfast. 1.过去某一时间点发生的动作对现在产生影响。 功能： I have learned English for ten years 2.过去某一时间点发生的动作持续到现在或还将持续下去。 基本结构 have / has + done 助动词 （可以帮助构成肯定、疑问和否定句） 过去分词 present(now) future past 现在完成时 ( present perfect tense) do my homework 1.He has cleaned his room. (写一个一般疑问句） Has he cleaned his room? 2. They have come back from work. (写否定句） They haven’t come back from work. 4. He has been to China, ____ ____? （写出反义疑问句部分） hasn’t he 3. She has lived in London for four years. (划线部分提问） How long has she lived in London? What are the key words for the Present Perfect Tense? A: ______ your brother ______ his homework yet? (finish) B: Yes, he ‘s already done it. Key words Has finished yet already 注