Unit1 Grammar 课件2022-2023学年牛津译林版英语八年级下册

Past and present Grammar Present perfect tense （现在完成时） 一. 构成 ： have / has + 动词过去分词 二. 含义 1）过去开始一直延续到现在的动作或状态。 She has lived here since she was born. I have taught English for 18 years. You have studied in this school since 2014. 注意： 动词必须为延续性动词。 1. My grandmother ______ a lot of changes in Tianjin since she came here. A. sees B. can see C. will see D. has seen 2. My aunt is a writer. She ______ more than ten books since 1980. A. writes B. wrote C. has written D. will write Have a try 2）发生在过去，对现在有影响的动作。 I have lost my key, so I can’t get into my house. Who has cleaned the window? It’s really clean. The bus has left, you must wait for the next one. I have seen the film. I won’t see it tonight. We ___________ (wash) our clothes. They’re clean now. 2. Julia isn’t going to the cinema with us because she ______ the film. A. sees      B. saw      C. will see       D. has seen have washed Have a try 3）到目前为止，事情发生的次数。 I have already read this book many times. My uncle has been to France twice. How many times have you been to Beijing? --- Do you like The Tale of Two Cities? --- Yes. I ________ (read) it three times. 2. --- Do you know the moving story of Jack and Rose? ---Of course. I ________ (see) the film Titanic several times. have read have seen Have a try 1. 现在完成时的肯定句句型 主语 （I/They/We/You) +have （第三人称复数） +have + 动词过去分词 （He/She/It） +has We have finished our homework. I have finished my homework. He has finished his homework. 三、现在完成时的不同句式 I / They/ We / You have +not+过去分词 He / She / It has 缩写形式 has not = hasn’t have not = haven’t 2. 现在完成时的否定句句型 主语+have/has+not+动词过去分词+…… I have not seen the movie yet. He hasn’t been to Beijing since then e.g. Mr Chen ________