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课件网) Unit 5 Going on an exchange trip Grammar Focus on 基本用法 The present perfect tense 现在完成时 *现在完成时的用法。 *现在完成时的句型。 *动词过去分词的变化规则示例。 Read the email and answer the questions. 1. Who taught Eric to play Go 2. What will Eric and his classmates do next week 3. Where does Eric want to invite his host brother 1 2 3 Eric has been in Beijing for a week. He wrote an email to share his exchange experience with his mother. Read the email again and pay attention to the underlined words. We form the present perfect with _____ _____ of the main verb. have / has + the past participle 你知道动词过去分词的变化规则吗？ Present perfect tense Base form 动词原形 SimplePast 过去式 变化规则 look look look move move move carry carr carr stop stop stop 一般动词，加ed 以不发音的e结尾的动词，加d 以“辅音+y”结尾的动词，变y为i，再加ed 以一个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 动词过去分词的变化规则示例 ed ed d d Past Participle 过去分词 ed ed p p ed y i ed y i cut cut cut let let let put put put have had had make made made spend spent spent do did done be was/were been go went gone 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： Base form 动词原形 Simple Past 过去式 Past Participle 过去分词 Click on the irregular(不规则) verbs. Read the email again and pay attention to the underlined words. Present perfect tense 现在完成时表示动作或状态从过去某一时间开始并一直持续到现在，而且可能持续到将来。 a week ago present future in Beijing 现在完成时表示在以前某个时间已经发生的行为或曾经做过的事情对目前有某种影响。 A B He has been to Beijing. 表示某人曾去过某地（现已回来） A B She has gone to Beijing. 表示某人在去某地途中或到了某地, 也可能在回来的路上 (现在还没有回来) 比较 have been to, have gone to 与 have been in A B He has been in Beijing. 表示某人在某地待了一段时间（现在还在那里），常和 for/since的时间状语搭配 (1) I have finished my work. (2) He has changed a lot in the past few years. (1) I have not finished my work. (2) It's Rachel's birthday tomorrow and her mother has not bought her a present. 主语 + have/has + 过去分词 + 其他. 1. 肯定句式 主语 + haven't / hasn't + 过去分词 + 其他. 2. 否定句式 现在完成时的句型 I / You / We / They have = I’ve / You’ve / We’ve / They’ve He / She / It has = He’s / She’s / It’s have not = haven’t has not = hasn’t 疑问词 + have/has + 主语 + 过去分词 + 其他 Have / Has + 主语 + 过去分词 + 其他 - Have you heard from your family lately /recently - Yes, I have./ No, I haven't. 3. 一般疑问句 肯定答语: Yes, 主语 + have/has. 否定答语: No, 主语 + haven't/hasn't. Where have you been during your summer holiday 4. 特殊疑问句 Sarah has been in Beijing for a week. She has stayed with her host family since 14 October. She has already tried a lot of local food in Beijing, but she hasn’t visited many ... ...
