第14讲 现在完成时和过去完成时的用法-【寒假自学课】2023年七年级英语寒假精品课（牛津上海版）

第13讲 现在完成时和过去完成时的用法 【学习目标】 1、 掌握现在完成时、过去完成时的基本用法 2、完成专项训练 【基础知识】 现在完成时的用法 现在完成时基本用法介绍 基本概念： 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，也可以表示过去已经开始，一直 延续到现在的动作或状态。 基本句型: 肯定句：have/has+ done (过去分词) 否定句：主语+have/has+not+ done (过去分词)+其他. 一般疑问句：Have/Has+主语+ done (过去分词)+其他. 简略答语：Yes, 主语 + have/has.(肯定) No, 主语 + haven't/hasn't.(否定) 以study 为例，其否定式、疑问式和简单回答形式如下： 否定式 疑问式 简单回答（肯/否定） I have not (haven’t) studied…. Have you studied…? Yes, I have. No, I haven’t. They have not (haven’t)studied…. Have they studied…? Yes, they have. No, they haven’t. He has not (hasn’t) studied…. Has he studied…? Yes, he has. No, he hasn’t. 基本结构: have/has + 过去分词 eg:I have never seen such fine pictures before. 动词过去分词不规则变化: 动词的过去分词有规则形式和非规则形式两种，规则形式同过去式的规则形式。非规则形 式需要特殊记忆。可以这样分类：AAA、ABB、ABA、ABC、AAB AAA式：bet, cost, cut, fit, hit, hurt, let, put, read, set, shut, spit, spread... ABA式：come came come become became become run ran run ABC式：steal stole stolen speak spoke spoken break broke broken drive drove driven write wrote written give gave given swim swam swum spring sprang sprung blow blew blown begin began begun drink drank drunk grow grew grown know knew known throw threw thrown show showed shown draw drew drawn take took taken do did done see saw seen ABB式：bring brought brought fight fought fought think thought thought buy bought bought catch caught caught tear tore torn wear wore worn keep kept kept sweep swept swept leave left left feel felt felt pay paid paid say said said send sent sent lend lent lent sell sold sold tell told told dig dug dug win won won sit sat sat hear heard heard meet met met make made made lose lost lost stand stood stood get got got build built built find found found understand