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课件网) Unit 7 A Good Read 第三课时 Section A (Grammar Focus 4a—4d) 八年级 英语（下） Read the sentences and underline the present perfect forms of the verbs. Pay attention to the meanings of the bold words. 4a Grammar Focus Have you decided on a book for your report Yes, I have. /No, I haven’t. Has Peter ever heard of this book No, he’s never heard of it. Has Chen Jie read this book yet No, but she’s already borrowed it from the library. What have you read recently I’ve just finished The Romance of the Three Kingdoms. I’ve=I have she’s=she has haven’t=have not hasn’t=has not 现在完成时 一、现在完成时的构成 现在完成时由“助动词have/has+过去分词”构成。 注：主语若是第三人称单数助动词用has 肯定句：主语 + have/has + 过去分词 + 其他. 否定句：主语 + have/has + not + 过去分词 + 其他. 一般疑问句：Have/Has + 主语 + 过去分词 + 其他？ 特殊疑问句：疑问词 + have/has + 主语 + 过去分词 + 其他？ 现在完成时的句型转换 以动词 finish 为例： 句式 结构 例句 肯定句 主语 + have/has + 过去分词 I have finished my homework. 否定句 主语 + have/has + not + 过去分词 I have not (haven't) finished my homework. 一般疑问句 Have/Has + 主语 + 过去分词？ Have you finished your homework 肯定回答 Yes, 主语 + have/has. Yes, I have. 否定回答 No, 主语 + haven't/hasn't. No, I haven't. 二、动词过去分词 规则动词的过去分词与过去式相同，不规则动词需要单独记忆。 规则动词过去分词构成： 规则 原形 过去分词 直接加 -ed finish finished 以 e 结尾加 -d decide decided 以“辅音 + y”结尾，变 y 为 i 加 -ed study studied 重读闭音节双写加 -ed stop stopped 常见不规则动词过去分词： 原形 过去分词 原形 过去分词 be been read read begin begun see seen buy bought take taken choose chosen teach taught come come tell told do done think thought eat eaten write written 原形 过去分词 原形 过去分词 go gone know known have had make made hear heard meet met leave left put put lose lost read read 常见不规则动词过去分词： 表示过去发生或已经完成的动作对现在造成的影响或结果。 三、现在完成时的用法 表示某一动作或状态从过去某一时间开始并一直持续到现在，可以和表示延续的时间状语连用。表示持续动作或状态的动词多是延续性动词。 past Fu Xing finished Alice’s Adventures in Wonderland. Fu Xing can share many interesting details of the book with Peter. Fu Xing has finished Alice’s Adventures in Wonderland. 1.表示过去发生或已经完成的动作对现在造成的影响或结果。 present present perfect past I read Around the World in Eighty Days for the first time. I've already read Around the World in Eighty Days twice. present present perfect I read Around the World in Eighty Days for the second time. 2. 表示一个动作到现在已经发生了多少次。 I’ve always loved reading fantasy books. past present future love present perfect 3. 表示过去发生的动作一直延续到现在，而且可能持续到将来。 for + 一段时间 / since + 开始时间(从句) 四、现在完成时的标志词 already / just / never / yet / ever so far / in the past few years past now Mr. and Mrs. Green have owned this house for fifty years. 50 years pa ... ...
