现在完成时课件2022-2023学年牛津译林版八年级英语下册

现在完成时 1 定义及结构 1 易错点 3 时间标志词 2 综合练习 4 目录 现在完成时复习课，寒假已讲过现在完成时新授课，本节是重点，难点易错点梳理复习，练习 2 定义及结构 01 3 past now Yesterday , we cleaned the classroom. Now , the classroom is clean because we have cleaned it. 用法1 强调过去发生的动作对现在产生的结果或影响 引入，复习现在完成时的两个用法 4 now past I began to teach English at this school five years ago. I have taught English at this school for five years. 用法2 过去发生的动作一直延续到现在，还有可能继续持续下去 现在完成时-基本结构：have/has+动词的过去分词 I have studied English for six years. 肯定句：主语+have/has+过去分词（done)+其他 否定句：主语+have/has+not+done+其他 疑问句：把have，has提前 重点，理解现在完成时结构及句式转换 6 过去分词的构成 1.直接加-ed。如：play-played 2.以字母e结尾的直接加d 。如：name-named 3.以辅音字母加y结尾的，变y为i加ed。如：carry-carried 4.重读闭音节且末尾只有一个辅音字母，双写这个辅音字母再加-ed。 如：stop-stopped 5. 不规则变化 AAA, ABB, ABC, AAB, ABA 规则变化 原形 过去式 过去分词 类型 become take lie(躺) sleep lay(放) put cost ... 不规则变化的动词过去式和过去分词 became took lay slept laid put cost become lain slept laid put cost ABC ABA ABC ABB ABB AAA AAA taken 不规则动词过去式的变化要总结规律哦 把下列句子改为否定句 I’ve already had dinner. I ________ ________ dinner ______. 2. He has just finished his homework. He ________ ________ his homework _________. 3. Mum’s cooked the dinner. Mum _______ ________ the dinner. 4. Susan’s learned English at school. Susan ________ ________ English at school. haven’t had yet hasn’t finished yet hasn’t cooked hasn’t learned 练习 9 把下列句子改为一般疑问句 I’ve already had dinner. 2. He has just finished his homework. 3. Mum’s cooked the dinner. 4. Susan’s learned English at school. Have you already had dinner? Has he just finished his homework? Has Mum cooked the dinner? Has Susan learned English at school? 练习 10 学习笔记 现在完成时 用法1 强调过去发生的动作对现在产生的结果或影响 用法2 过去发生的动作一直延续到现在，还有可能继续持续下去 现在完成时-基本结构： have/has+动词的过去分词 肯定句：主语+have/has+过去分词（done)+其他 否定句：主语+have/has+not+done +其他 疑问句：把have，has提前 过去分词的构成 规则变化 不规则变化 时间标志词 02 already 已经(肯定句) yet 已经（疑问句） 还（否定句） ever 曾经(疑问句) never 从来不 just 刚刚 so far 到目前为止 twice /其他倍数 两次、几次 in the past/last few years 在最近的几年里 标志词有哪些？ 练一练