Unit7&Unit8语法知识点总结与练习2025-2026学年人教版英语八年级下册

该初中英语讲义通过结构化梳理构建现在完成时知识体系，Unit7系统整合基本结构、否定句、疑问句及标志词等基础要点，Unit8深入讲解动作持续用法、for与since区别及非延续性动词转换，形成由浅入深的知识脉络，助力学生夯实语言能力基础。 讲义亮点在于针对性练习设计，如Unit7通过标志词辨析题（already/yet）、Unit8通过for/since应用题及非延续性动词转换题，解析精准且分层，培养学生分析比较的思维品质与策略运用的学习能力。基础学生可巩固语法规则，进阶学生能深化理解，为教师精准教学和学生自主复习提供有效支持。

八下英语单元U7&U8语法知识点总结与练习 Unit7 现在完成时（一） 一、语法知识点总结 1、现在完成时的结构 现在完成时的基本结构是 have / has + 过去分词。 主语是 I / you / we / they 或复数名词时，用 have；主语是 he / she / it 或单数名词时，用 has。 例：I have finished my homework. 例：She has cleaned her room. 2、否定句 结构：主语 + haven’t / hasn’t + 过去分词。 例：I haven’t read this book yet. 3、一般疑问句 结构：Have / Has + 主语 + 过去分词…? 回答：Yes, 主语 + have / has. / No, 主语 + haven’t / hasn’t. 例：Have you ever been to Beijing? Yes, I have. / No, I haven’t. 4、基本用法 现在完成时常表示过去发生的动作对现在造成影响或结果，强调现在的情况。 例：I have lost my key.（现在没有钥匙。） 5、常见标志词 already 已经，常用于肯定句；yet 还/已经，常用于否定句和疑问句；ever 曾经，常用于疑问句；never 从未；just 刚刚；so far 到目前为止；before 以前。 6、have been to 与 have gone to have been to 表示“去过某地”，现在已经回来；have gone to 表示“去了某地”，现在还没回来。 例：I have been to Shanghai twice. 例：Tom has gone to Shanghai. 7、现在完成时与一般过去时的区别 现在完成时强调过去动作对现在的影响；一般过去时强调动作发生在过去的某个时间。 例：I have seen the film. 例：I saw the film yesterday. 二、巩固练习 1. —Have you finished your homework ____? —Yes, I finished it ten minutes ago. A. already B. yet C. ever D. never 2. I ____ the story before, so I can tell it to you. A. read B. am reading C. have read D. will read 3. —____ you ever ____ to the Great Wall? —Yes, I went there last year. A. Did; go B. Have; been C. Will; go D. Are; going 4. Tom isn’t here. He ____ to the teachers’ office. A. has been B. has gone C. went D. goes 5. My sister has ____ finished her report. She finished it just now. A. yet B. ever C. never D. just 6. I ____ this movie yesterday, so I don’t want to watch it again today. A. see B. saw C. have seen D. will see 7. —Has your father come back from work? —No, he ____. A. hasn’t B. haven’t C. didn’t D. doesn’t 8. So far, we ____ three English books this term. A. read B. are reading C. have read D. will read 参考答案 1、B 解析：yet用于疑问句末尾。 2、C 解析：before是现在完成时标志词，have read。 3、B 解析：ever是现在完成时标志，have been to去过。 4、B 解析：人不在现场，have gone to去了某地未回。 5、D 解析：just刚刚，刚刚完成。 6、B 解析：yesterday过去时间，只用一般过去时saw。 7、A 解析：has提问，否定回答用hasn’t。 8、C 解析：so far到目前为止，现在完成时have read。 Unit8 现在完成时（二） 一、语法知识点总结 1、表示动作或状态持续到现在 现在完成时可以表示某个动作或状态从过去开始，一直持续到现在，并可能继续下去。 例：I have lived here for five years. 2、for + 时间段 for后接一段时间，表示“持续了多久”。如 for three days, for two years, for a long time, for ten minutes。 例：They have stayed here for two weeks. 3、since + 时间点 since后接时间点，表示“自从……以来”。如 since 2020, since last week, since two years ago, since I was a child。 例：We have known each other since 2018. 4、for与since的区别 for后接时间段；since后接时间点或一般过去时从句。 例：I have had this bike for three years. 例：I have had this bike since three years ago. 5、非延续性动词不能和一段时间连用 在肯定句中，如果现在完成时和 for + 时间段或 since + 时间点连用，谓语动词通常要用延续性动词。 例：错误：He has bought the book for two weeks. 例：正确：He has had the book for two weeks. 6、常见非延续性动词与延续性表达转换 buy → have；borrow → keep；open → be open；close → be closed；leave → be away；die → be dead； begin/start → be on；finish → be over；join → be in / be a member of；come/arrive → be here；go → be there；marry → be married。 7、非延续性动词在否定句中的特殊情况 在否定句中，非延续性动词可以和一段时间连用，表示“多久没有做某事”。 例：I haven’t seen him for a long time. 二、巩固练习 1. I have lived in this city ____ ten years. A. since B. for C. in D. at 2. My uncle has worked in this school ____ 2015. A. for B. since C. during D. before 3. The movie ____ for twenty minutes. You missed the beginning. A. has begun B. began C. has been on D. begins 4. I have ____ this dictionary for three years. A. bought B. had C. borrowed D. kept 5. His grandfather ____ for five years. A. died B. has died C. has been dead D. was dead 6. They have been friends ____ they were in primary school. A. for B. since C. before D. after 7. Tom borrowed the book last week. Tom has ____ the book for a week. A. borrowed B. lent C. kept D. bought 8. I haven’t heard from my cousin ____ a long time. A. since B. for C. at D. on 参考答案 1、B 解析：for+时间段，ten years是时间段。 2、B 解析：since+时间点2015。 3、C 解析：for+时间段，begin是非延续动词，换成be on。 4、B 解析：buy非延续，have表示拥有的延续状态。 5、C 解析：die非延续，be dead表示去世的状态。 6、B 解析：since+一般过去时从句。 7、C 解析：borrow非延续，keep表示借阅持有。 8、B 解析：for a long time很长一段时间。 学科网（北京）股份有限公司 $