Module 2 Experiences Unit 3 课件 2022-2023学年外研版英语八年级下册

Unit 3 Language in use Present perfect Focus on 基本含义和用法 现在完成时（1） 现在完成时的用法 1 I have seen the film. I do not want to see it again. 2 My aunt has travelled all over the world. 现在完成时表示在以前某个时间发生的行为或曾经做过的事情对目前有某种影响； 到目前为止已经完成的事情。 （看过电影了，不想再看了。） (到目前为止已经完成的事情) 肯定句: 主语+have/has+过去分词 I have learnt English for 5 years. He/She has leant English for 5 years. They have lived here since 2012. 否定句: 主语+have/has+not+过去分词 I haven't learnt English for 5 years. He/She hasn't leant English for 5 years. They haven't lived here since 2012. 现在完成时的结构 一般疑问句:Have/Has+主语+过去分词 简略答语: Yes, 主语 + have/has.(肯定) No, 主语 + haven't/hasn't.(否定) —Have your father come back home yet? —Yes, he has. —No, he hasn't. They have been to Mars. 否定句：____________________________ 一般疑问句：_________________________ 肯定回答：_________________ 否定回答：_____________________ 句型转换。 They haven’t been to Mars. Have they been to Mars? Yes, they have. No, they haven’t. 随学随练一 大部分动词-ed形式的变化方式是规则的，与动词过去式的变化规则相同： 1. 一般直接在词尾加上ed。 look—looked—looked 2. 以e结尾的动词，直接加d。 move—moved—moved 3. 以y结尾，y前面是辅音字母的动词，变y为i，再加ed。 carry—carried—carried 4. 以辅音字母+元音字母+辅音字母结尾的重读闭音节动词，双写词尾辅音字母，再加-ed。 stop—stopped—stopped 现在完成时的过去分词变化规则 cut cut cut let let let put put put read read read have had had make made made spend spent spent tell told told do did done be was/were been go went gone see saw seen A-A-A型 (动词原形、过去式、过去分词都同形) A-B-B型 (动词过去式、过去分词同形) A-B-C型 (动词原形、过去式、过去分词都不同形) 但也有一部分动词-ed形式的变化是不规则的，没有规律，需要记忆。比如： She has ___________(travel) to Shanghai many times. travelled 9 Have they _______(eat) local food? eaten Ⅰ. 根据语境及括号内的词语提示完成下列句子或对话。 1. ________ you ever ________(be) to Paris? 2. —Where’s Helen? —She __________(go) to the dining hall. 3. So far Sonia ______________(not write) to me. Have been  has gone  hasn’t written  4. We ___________(see) Lily’s b