Unit 3 The World of Science Using Language 课件-2022-2023学年高中英语外研版（2019）必修第三册

The world of science Using language Unit 3 1 Activity 1 Describe the paictures with Present perfect tense. Someone has broken the window. He has finished his homework. 表示说话时已经完成的动作，而且这个动作的结果对现在还有影响 2 Activity 1 Describe the paictures with Present perfect tense. He has taught in our school for 30 years. 表示动作发生在过去，但一直持续到现在，并且有可能继续持续下去 3 4 使用现在完成时的注意事项 时间状语 during/ over/ in the last/ past+时间段, ...等时间状语 since+时间点, already, recently, lately, so far, up to now, until now for＋时间段, ever since these days (years, months, weeks) 5 1. During the last three decades, the number of people participating in physical fitness programs ____________(increase) sharply. 2. Simon_____________(attend) his father for such a long time that he understands almost every gesture of his father’s. 3. I complained to the manager of the hotel about the poor service last week, but up to now, I ________________ (receive) his reply. 4. In recent months, the China Grand Canal Museum in Yangzhou, which exhibits the history and culture of the Grand Canal, ________________(attract) a great number of visitors. have increased has attended haven’t received has attracted Q:怎么知道上面用现在完成时的？ A: 根据时间状语 Practice 1. After several years of observation, the research group _______________(arrive) at the conclusion that language acquisition is faster when students are exposed to the situation where it is spoken. 2. Great changes _____________(take) place in my hometown and you can see that a lot of factories have been set up. has arrived have taken Q:上面的句子没有时间状语，为什么要用现在完成时？ A: 根据语境；表示“到目前为止，已经……” 1. It is the first time that the local education authority _____________ (make) such strict requirements on going-to-school time for primary and middle school students. 2. It ______________(be) ten years since we met last time. 3. We ______________(be) to Beijing four times, so this time we won’t choose Beijing as a destination. has made is/has been have been Q:上面的句子没有时间状语，为什么要用现在完成时？ A: 固定句型 It is