Unit8 Making a Difference单元语法讲义 2025-2026学年人教版英语八年级下册

该初中英语讲义以“单元核心语法”为框架，分模块构建知识体系，通过口诀（如“过去开始、持续现在、状态不变”）、对比表格（for/since辨析）及例句解析，系统梳理现在完成时延续用法、动名词doing等重难点，清晰呈现语法规则内在联系与易错点分布。 讲义亮点在于分层练习设计，从基础单选（如考used to与be used to辨析的第8题）到提升句型转换、易错纠错，搭配“敲黑板”必背口诀，助力学生夯实语言能力、培养学习策略，既支持基础薄弱学生掌握方法，也为优秀生提供拓展空间，便于教师实施精准化复习教学。

新人教版八年级英语下册 Unit8 Making a Difference单元语法精讲精练 单元核心语法 1. 现在完成时（延续用法）for / since（单元重中之重、中考必考） 2. ever since 引导时态句型 3. 动名词 doing 作主语、宾语、介词宾语 4. 高频固定句型（stick to doing / be used to doing / offer to do） 一、语法一：现在完成时「延续性用法」 1. 用法 表示动作从过去开始，一直持续到现在，可与 for / since 连用。 口诀：过去开始、持续现在、状态不变 2. 结构 肯定：主语 + have/has + 过去分词 否定：主语 + have/has + not + 过去分词 疑问：Have/Has + 主语 + 过去分词…? 3. for & since 必考辨析 （1）for + 时间段（一段时间长度） for two years for three months for a long time （2）since + 过去时间点 / 一般过去时句子（起点） since 2023 since last year since I was young since I joined the team 4. 必考规则（易错点） 1). how long 提问时长 → 必须用现在完成时 2). 短暂动词不能与 for/since 连用！必须变延续动词 join → be in begin/start → be on buy → have leave → be away 例句： ✅ I have been in the volunteer team for two years. ❌ I have joined the team for two years.（错误） 5. ever since 高阶句型 ever since + 过去动作，主句现在完成时 意为：自从……以来（一直……） 例： Ever since I came here, I have changed a lot. 二、语法二：动名词 doing 用法 1. doing 作主语（谓语用单数） 结构：Doing sth. + 动词单数 Helping others makes us happy. Volunteering is meaningful. 2. doing 作固定动词宾语（只接 doing） enjoy doing 喜欢做 finish doing 完成做 keep doing 坚持做 mind doing 介意做 practice doing 练习做 3. doing 作介词宾语 单元高频考点：to 是介词，后接 doing 1). stick to doing 坚持做 2). be used to doing 习惯于做 3). the key to doing ……的关键 口诀：只要 to 是“朝向、归属”，后面全部加 doing！ 例句： We should stick to helping others. Helping others is the key to living a happy life. 三、单元必考固定句型 1. be willing to do sth. 愿意做某事 2. offer to do sth. 主动提出做某事 3. try one’s best to do 尽力做某事 4. make a big difference to… 对……产生大影响 5. used to do 过去常常做（现在不做） 6. be used to doing 习惯于做某事 四、语法基础过关练习 单项选择 ( ) 1. I ______ a volunteer for three months. A. am B. was C. have been D. will be ( ) 2. He has learned English ______ he was seven. A. for B. since C. in D. at ( ) 3. Ever since I ______ the club, I have become more helpful. A. join B. joined C. have joined D. will join ( ) 4. Helping others ______ a meaningful thing. A. is B. are C. was D. were ( ) 5. She enjoys ______ volunteer work in her free time. A. do B. doing C. to do D. does ( ) 6. We should stick to ______ good deeds every day. A. do B. doing C. does D. did ( ) 7. The key to ______ happy is helping others. A. be B. being C. is D. are ( ) 8. He ______ stay at home, but now he ______ volunteering. A. used to; is used to doing B. is used to; used to do C. used to; used to do D. is used to; is used to doing ( ) 9. —How long have you volunteered? —______ two years ago. A.From B. Since C. In D. For ( ) 10. I have ______ my homework already. A. finish B. finished C. finishing D. finishes ( ) 11. They are willing ______ people in need. A. help B. to help C. helping D. helped ( ) 12. He keeps on ______ others and never gives up. A. help B. helping C. to help D. helps ( ) 13. Small acts can make a difference ______ the world. A. for B. in C. to D. at ( ) 14. Have you finished ______ the notice? A. write B. writing C. to write D. writes ( ) 15. Volunteering ______ me feel satisfied. A. make B. makes C. making D. made 五、语法提升专练 句型转换 1. I have been a volunteer for two years.（划线提问） ______ ______ have you been a volunteer? 2. He joined the team last year.（同义句） He ______ ______ in the team ______ last year. 3. Helping others is very meaningful.（改为同义句） ______ very meaningful ______ help others. 4. She used to watch TV on weekends.（否定句） She ______ ______ to watch TV on weekends. 5. We should stick to doing good deeds.（一般疑问句） ______ you ______ stick to doing good deeds? 六、语法易错纠错 改正下列句子错误 1. I have joined the club for one year. 2. He is used to do volunteer work now. 3. The key to live a happy life is kindness. 4. Ever since I am young, I love helping others. 5. Finish homework makes me relaxed. 七、语法填空 用所给词适当形式填空 1. I ________ (be) a volunteer since last term. 2. Ever since he ________ (come) here, he ________ (change) a lot. 3. Helping others ________ (bring) us happiness. 4. We should stick to ________ (do) small good things. 5. She is willing ________ (help) homeless people. 6. He ________ (used to) stay up late, but now he has a healthy habit. 7. Keep on ________ (volunteer), and you will make a difference. 8. I have finished ________ (clean) the room. 9. The key to ________ (succeed) is never giving up. 10. They ________ (donate) many books to poor kids so far. 参考答案 & 部分解析 4、 语法基础过关练习 单项选择 1.C 现在完成时+for时间段 2.B since+时间点 3.B ever since后接一般过去时 4.A 动名词作主语谓语单数 5.B enjoy doing 6.B stick to doing固定考点 7.B the key to doing 8.A used to do / be used to doing 经典辨析 9.B since+时间段ago 10.B have+过去分词 11.B be willing to do 12.B keep on doing 13.C make a difference to 14.D finish doing 15.B 动名词单数谓语 五、语法提升专练 句型转换 1. How long 2. has been; since 3. It’s; to 4. didn’t use 5. Should; / 六、语法易错纠错 改正下列句子错误 1. I have been in the club for one year. 2. He is used to doing volunteer work now. 3. The key to living a happy life is kindness. 4. Ever since I was young, I have loved helping others. 5. Finishing homework makes me relaxed. 七、语法填空 用所给词适当形式填空 1. have been 2. came; has changed 3. brings 4. doing 5. to help 6. used to 7. volunteering 8. cleaning 9. succeeding / success 10. have donated ※敲黑板：单元语法必背三句话 1. for+段、since+点，how long提问用现完，短暂动词要变延（续）。 2. 看见 stick to / be used to / the key to → 后面一律跟doing。 3. 动名词作主语，谓语动词用单数。 学科网（北京）股份有限公司 $