Unit 8 Making a Difference Section A 4a-4d 课件 2025-2026学年人教版八年级英语下册

该初中英语课件聚焦现在完成时，以志愿者经历语法填空导入，通过结构解析、时间轴可视化、for/since用法对比及非延续性动词转换等学习支架，构建从基础到语篇应用的完整知识脉络。 其亮点是以“志愿者”主题为真实语境，结合时间标志词练习、小组采访活动及复习视频提示，在提升语言能力（语法应用于交流）和思维品质（动词延续性辨析）的同时，助力学生在情境中掌握语法，教师可通过清晰步骤和多样化活动优化教学。

Unit 8 Making a Difference Section A What can we do to help? 4a-4d Retell Hi,  I'm  Teng Fei. I___________ (be) a volunteer atthe nursing home _______last year. I've exercised with the elderly ___ help them stay active, and I've played Chinese chess with them too. I've even________ (teach) some of them how to use _____ mobile phone. I' ve _______(meet) many lonely elderly people there. Since I started volunteering,  I've listened to ______(they) interesting life ______(story)  and_______________(learn) to care ______them.  _____________ (volunteer) has made me happy, and I want to keep_______(do) it. have been since  to  taught met for  Volunteering  doing a their  stories  learned /learnt present perfect tense 现在完成时 结构: have /has+ done (V过去分词) past present （now） future 表示过去发生或已经完成的某一动作对现在造成的影响或结果。 Present Perfect Tense 现在完成时 用法(一)： I have already watched the movie. I watched the movie last week. 我看了电影 (看了电影，现在知道电影内容) I know this movie. 我了解这个电影 站在现在，回望过去 past present （now） future 表示过去已经开始并一直持续到现在，并有可能还会持续下去的动作或状态。 用法(二)： Present Perfect Tense 现在完成时 I became a volunteer in 2020. 我成为志愿者。 I'm still a volunteer now. 我依然是志愿者。 一直持续到现在 I have been a volunteer since 2020 / for six years. (我从2020开始到现在一直都是志愿者) since 2020 for six years Discussion 表示过去已经开始并一直持续到现在，并有可能还会持续下去的动作或状态。 用法(二)： Present Perfect Tense 现在完成时 现在完成时 时间标志词 谓语动词特点 Grammar Read the sentences. How are for and since used differently? 一先找出现在完成时的结构，二找出for和since 的区别 4a for + 时间段 for + 时间段 since a few since a long time ago for + 时间段 时间标志词 since +时间点 since +具体时间 since +从句 (一般过去时) since +时间段+ago months ago Practise 1. Mr. Brown has had his TV ________ 15 years. 2. I’ve taken driving lessons _________ last month. 3. Tom has worked in the factory _______ he left school ten years ago. 4. My friends haven’t visited me _______ my birthday. 5. She hasn’t had a good cup of coffee _______2 years. 6. Tom has worn glasses _________ two years ago. for since for since since since 用since或for填空。 时间标志词 for + 时间段 since +时间点 谓语动词特点 Present Perfect Tense 现在完成时 Look at these sentences. Do you think they are right or wrong? 1 I have bought this book for 3 years. 2 He has  joined  the group since two weeks ago. 3 He has died for three years. 非延续性动词表示的动作极其短暂，不能持续。因此，在现在完成时肯定句中不可与表示一段时间的状语连用，应改用延续性动词。 had been in been dead 谓语动词特点 Present Perfect Tense 现在完成时 Look at these two sentences. Do you think they are right or wrong? 1 I haven't heard from him for a year. 2 I haven't heard from him since March. 在现在完成时否定句中，因为非延续性动词的“非延续性” 被否定，成为可以延续的状态，因而可与表示一段时间的状语连用，说明某个动作一直没发生。 Discussion 谓语动词特点 Presentatinon has taught for since have been for Since since has helped has trained 大学生 享受做... 军队 军人 ...的一员 红十字会 加入组织 在小学 start = begin 开始 start to do sth. =start doing sth. 开设课程；提供课程 Presentatinon have worked have helped have made have met met was got smiled thanked 在一家体育机构 帮忙做.. 体育赛事 运动员 阿根廷 在体育场内 一场慈善比赛 adv. 热情地 be proud to do 对做...感到骄傲 Work in groups. Interview your groupmates using the questions below. 4d How long have you • known your best friend / that girl / …? • had your favourite toy / bag / …? • lived in this town / your neighbourhood / …? 1 —How long have you known your best friend? —I have known my best friend for five years. 2 —How long have you had your favourite toy? —I have had my favourite toy for six months. 3 —How long have you lived in your neighbourhood? —I have lived in this neighbourhood since 2023. 现在完成时 Review Practise 1._______ two years 2._______ two years ago 3._______ last month 4._______1999 5._______ yesterday 6._______4 o’clock 7._______ about 4 months 8. _______ she was a baby 9.________we were children 10. _______ six hours for since since for since since since since since for 时间标志词 for + 时间段 since +时间点 1. Tom is in the youth group now.  He joined the group two  weeks  ago. 2. I have a camera.  I bought it in 2023.  3. Grace lives in this village.  She started to live here when she was born. 4. My sister works as an animal helper now.  She got this job last year.  Tom has been in the youth group since two weeks ago. I have had a camera since 2023.  Grace has lived in this village since she was born. My sister has worked as an animal helper for one year. 谓语动词特点 Present Perfect Tense 现在完成时 Lavf58.76.100 $