Unit 1 Grammar 课件2022-2023 学年牛津译林版英语八年级下册

Unit 1 Past and present Grammar 现在完成时的基本构成 ： have/has + 动词过去分词 1. We use the present perfect tense to talk about an action that started in the past and continues to the present. 表示过去开始持续到现在的动作。 Millie在北京住了两年了。 Millie has lived in Beijing for two years. Millie两年前搬到了北京。 Millie moved to Beijing two years ago. 现在完成时的意义 2. We use the present perfect tense to talk about an action that happened in the past and has a connection with the present. 表示发生在过去、对现在有影响的动作。 Eddie ___ Hobo’s food just now. Eddie ______ just ______ Hobo’s food. (Eddie ate the food and now Hobo has nothing to eat. ) Past Present ate has eaten 现在完成时的意义 3. We use the present perfect tense to talk about how many times an action has happened till now. 表示到目前为止一个动作发生（重复）的次数。 Bill visited Australia in 2002 and 2020. Bill has been to Australia twice. Past Present 现在完成时的意义 1）过去开始一直延续到现在的动作或状态。 2）发生在过去，对现在有影响的动作。 3）到目前为止，事情发生的次数。 You have studied in this school since 2014. Who has cleaned the window ? It’s really clean. My uncle has been to France twice. 现在完成时的意义 现在完成时的不同句式 They have been to Shanghai three times. Have they been to Shanghai three times? Yes, they have. / No, they haven’t. They haven’t been to Shanghai three times. How many times have they been to Shanghai? 肯： 否： 一般疑问： 特殊疑问： We have already finished our homework. 我们已经完成作业了。句中 / 句末 They haven’t finished their homework yet. 他们还没有完成作业。句末 1. already 已经 肯定句 yet 还，仍 否定句 / 疑问句 Adverbs of time 时间状语 Have you ever watched the World Cup? 你曾经看过世界杯吗? 2. ever 曾经 肯定句 / 疑问句 never 从未 否定句 Adverbs of time 时间状语 I have never watched the World Cup. 我从未看过世界杯。 My father has lived here for 20 years. 3. since 自从 + 过去的时间点/一般过去时从句 for 长达 + 一段时间 我爸爸在这住了二十年了 。 My father has lived here since 20 years ago. 自爸爸到苏州以来, 就一直住在这儿。 My father has lived here since he came to Suzhou. Adverbs of time 时间状语 since or for? We ha