128正初中英语语法复习——现在完成时.ppt

现在完成时 现在完成时的构成形式 肯定句：主语+have/has +过去分词 They have seen the film. 否定句：主语+have/has +not+过去分词 They have not seen the film. 一般疑问句：Have/Has+主语+过去分词 Have they seen the film? * * 现在完成时的主要用法 现在完成时的时间状语 短暂性动词与时间段的关系 have been 与have gone 比较 与一般过去时的用法比较 现在完成时的构成 Definition 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。 1.过去某一时间点发生的动作对现在产生影响。 I have learned English for ten years. We have visited your school before. He has lost his key to his bike. He has lived in London since ten years ago. 1.He has cleaned his room. (变一般疑问句和否定句） Has he cleaned his room? 2. She has lived in London for four years. (划线部分提问） How long has she lived in London? A: ______ your brother ______ his homework yet? (finish) B: Yes, he ‘s already done it. Key words Has finished yet already 注意：already 用于肯定句， yet 用于疑问句和否定句中 A: _______ you ever _______ to the park? ( be ) B: No, never. Key words Have been yet already ever never 注意： ever 曾经 用于疑问句中 never 从不 带有否定意义 I ______ just ________ the desk, you can take it to your classroom . (mend ) Key words have mended yet ever never just already Just 刚刚 与现在完成时连用 一般置句中 Just now 刚才 与一般过去时连用 before Tom ___________ in the factory since he left school ten years ago. (work ) Key words has worked yet ever never just already since 后面接（时间点 ）过去时间或有一般过去时的句子 before since A: How long ______ you ________ in this school? (teach ) B: For 6 years. Key words have taught yet ever never since for already + 一段时间 just We _______ only ____________ 100 trees so far. (answer ) Key words have planted yet ever never since for already so far 到目前为止 just before Key words yet ever never since for just before already so far in the pa