Unit 1 Water 语法精讲精练（时间状语从句） - 2026学年沪教版（五四学制）八年级上册英语

**基本信息** 聚焦时间状语从句系统突破，以“概念-引导词-时态-简化”为逻辑链，融合方法总结与梯度训练，提升语言运用与思维辨析能力。 **专项设计** |模块|题量/典例|方法提炼|知识逻辑| |----|-----------|----------|----------| |概念解析|含义+位置解析|定义法+位置规则（句首逗号/句末无逗号）|从基础认知构建时间状语从句本质特征| |引导词辨析|9类引导词（含when/while对比）|含义+动词类型+时态公式（如as soon as“主将从现/主过从过”）|通过对比辨析深化核心考点理解| |时态应用|4类时态规则（主将从现等）|时态呼应原则（主句时态→从句时态匹配）|构建语法规则系统化认知框架| |从句简化|2个简化典例|主从句主语一致+分词结构（引导词+现在分词）|实现表达简洁化的语法技能训练| |综合应用|5类题型（单选15题等）|多维度考点综合应用（辨析+填空+转换+语篇）|整合语言知识与语境运用能力|

沪教版（五·四学制）八年级上册Unit 1 Water 语法练习 时间状语从句 时间状语从句的含义解析： 时间状语从句就是充当时间状语的句子 We will pick apples in autumn. （时间状语） We will pick apples when it is autumn. （时间状语从句） When it is autumn, we will pick apples. 时间状语从句的位置： 放句末，无逗号；放句首，逗号隔开 时间状语从句的引导词： 时间状语从句常用引导词： when/while/ before /as /after / until / till / since / as soon as 等 1)when 当...时,表示主句和从句的动作同时或先后发生，时间状语从句的动词可以用延续性动词，也可以用短暂性动词 We will pick apples when it is autumn. 在秋天，我们将采摘苹果。 When you are crossing the street,you must be careful.当你正在过马路时，必须小心。 He was working at the table when I went in. 当我进来的时候，他正在桌子旁工作。 2)while 当...时，引导的时间状语从句的动词常用延续性动词 They arrived while we were having dinner. 当我们正在吃晚饭的时候，他们到了。 3)before 在...之前 We will buy some snacks before the movie starts. 在电影开始之前，我们会买些零食。 4)after 在...之后 We can go for a walk after the rain stops.雨停后，我们可以去散步。 根据句子的含义，选择合适的时间状语从句的引导词是关键一步。 除了理解引导词的含义，还需要注意引导词在从句中的时态 时间状语从句的时态 We will pick apples when it is autumn. 主句　　　　　 从句 We will buy some snacks before the movie starts. 主句　　　　　 从句 We can go for a walk after the rain stops. 主句　　　　　 从句 从例句能够发现: 当主句是“一般将来时或含有情态动词”时，从句的时态为“一般现在时”， 【总结】时间状语从句通常遵循“主将从现/主情从现”的原则。 I saw a cat when I was walking in the park. 主句　　　　从句 The plane had taken off before I arrived at the airport. 主句　　　　 从句 She would go swimming after she finished her homework. 主句　　　　 从句 从例句能够发现： 当主句时态为“过去的时态”，从句需要根据动作的先后顺序、动词的类型，选择过去的相应时态。 【总结】当主句为“过去的时态”，从句需要根据主从句动作发生的先后顺序以及动词的类型，选择合适的过去的相应时态。 when/while 引导的时间状语从句的时态 when/while 引导的时间状语从句的时态是考试的易考点，也是易错点，需要重点作比较。 When 的用法： I was sleeping when the phone rang. 主句　　　　从句 rang 为短暂性动词 She saw a cat when she was riding her bike. 主句　　　　从句 ride her bike 为延续性动词 when 引导的时间状语从句可以用短暂性动词，也可以用延续性动词 while 的用法： My phone rang while I was doing my homework. 主句　　　 　从句 Her friends were dancing while she was singing. 主句　　　 　从句 while 引导的时间状语从句只能用延续性动词 注意：当表示两个动作同时进行，只能用 while. 时间状语从句的简化 当主从句的主语都是同一个人 ,这时从句的主语可以省略，直接用引导词+现在分词的形式，这也是时间状语从句简化的必要条件。 While I was waiting for the bus,I met an old friend. While waiting for the bus,I met an old friend. While he is doing his homework,he sees a bird. While doing his homework,he sees a bird. 【总结】时间状语从句的简化条件： 1.主句和从句的主语为同一个人 2.结构用“引导词+现在分词”形式 除了 when /while /after /before 这些引导词外，时间状语从句的引导词还有 as/ till /until /since / as soon as/by the time 5)as 的用法： as 引导时间状语从句表示“正当，一边...一边...,随着”的含义 →表示某一件事一发生，另一件事随即发生 As the sun rose ,the fog disappeared. 太阳一出来，雾就散了。 →表示某事发生的过程中另一件事发生 I heard his voice as I crossed the hall. 我走过大厅的时候听到他说话的声音。 →表示两个动作同时发生 She smiled as she passed. 她路过的时候笑了一下。 She listened to music as she washed clothes. 她一边洗衣服一边听音乐。 6)as soon as 一…就… I will call you as soon as I arrive home. 我一到家就给你打电话。 He jumped with joy as soon as he heard the good news. 他一听到这个好消息就开心地跳了起来。 as soon as 用法总结： 遵循“主将从现”“主过从过”的原则 7)since 自从 She has worked as a doctor since she moved to Beijing. 自从她搬到北京以来就一直当医生。 since 用法总结： since 引导的时间状语从句，需要注意： since 从句用“一般过去时”,主句用“现在完成时” 8)by the time 到...为止 He had travelled to more than four countries by the time he was twelve years old. 到他十二岁为止，他去过的国家已经超过四个。 by the time 用法总结： by the time 引导的时间状语从句， by the time 从句用“一般过去时”，主句用“过去完成时” 9)until 直到…… He will stay at home until/till the rain stops. 他会一直待在家里，直到雨停。 We were waiting until/till she came back. 我们一直等，直到她回来。 until 引导的时间状语从句，时态遵循：“主将从现，主过从过”。主句的动词必须为“延续性动词”，并且这时可以和 till 相互转换。 当主句的动词为“短暂性动词”或“延续性动词”时，否定形式只能用： not...until... 直到…才… （till 不可以用于否定） We didn’t leave until he came. 直到他回来，我们才离开。 短暂性动词 She doesn’t study until the teacher reminds her. 直到老师提醒她，她才开始学习。 延续性动词 沪教版八上时间状语从句专项练习 一、单项选择 ( )1. I’ll send you a message ______ I get to the library tomorrow. A. while B. as soon as C. since D. until ( )2. ______ my father was reading newspapers, my mother was washing dishes. A. When B. Before C. While D. After ( )3. We won’t leave the classroom ______ we finish all the exercises. A. until B. if C. since D. though ( )4. The boy ______ a cartoon when the light went out last night. A. watches B. watched C. was watching D. is watching ( )5. Great changes ______ in this town since 2016. A. take place B. took place C. have taken place D. will take place ( )6. By the time the film began, we ______ our snacks. A. buy B. bought C. have bought D. had bought ( )7. You should brush your teeth ______ you go to bed every night. A. after B. before C. until D. as soon as ( )8. ______ walking along the lake, we saw many beautiful birds. A. While B. Since C. Until D. After ( )9. As the sun ______, all farmers went back home. A. set B. sets C. will set D. is setting ( )10. —Can you wait here ______ I return? —Of course. A. as soon as B. until C. when D. after ( )11. He didn’t stop playing football ______ the teacher asked him to. A. while B. since C. until D. before ( )12. I was doing homework ______ someone knocked at the door loudly. A. while B. when C. since D. as ( )13. She has lived in this city ______ she was five years old. A. when B. until C. since D. as soon as ( )14. ______ you finish your homework, you can go out to play. A. Before B. After C. Until D. While ( )15. Two actions happen at the same time, we only use ______. A. when B. while C. until D. as soon as 二、用括号内所给词的适当形式填空 1. I ______ (call) you as soon as I arrive at the station. 2. While my sister ______ (draw) last night, I watched TV. 3. He ______ (live) in the countryside since he left school. 4. By the time the party ______ (start), we had bought some drinks. 5. You can’t go out until you ______ (clean) your bedroom. 6. As she ______ (walk) past the shop, she saw a lovely cat. 7. ______ (wait) for the bus, I met my old classmate. 8. He fell asleep while he ______ (read) English novels last night. 9. We ______ (not go) shopping until the rain stops. 10. As soon as he ______ (hear) the news, he jumped happily yesterday. 11. By the time he ______ (be) 10, he had visited three cities. 12. When I ______ (walk) in the street yesterday, it began to rain. 三、根据句意及首字母提示补全引导词 1. I will tell you the truth a______ I see you. 2. W______ my mum was cooking, my dad was watering flowers. 3. We will stay here u______ the rain disappears. 4. He has learned English s______ he was seven. 5. B______ you cross the road, look left and right carefully. 6. A______ the rain stopped, we went for a walk. 7. B______ the concert ended, we had eaten all snacks. 8. A______ she sang, she danced on the stage. 9. W______ doing sports, we should drink enough water. 10. It was raining w______ we went out last Sunday. 四、句型转换 1. I will go to the park after I finish my homework.（用until改写） I ______ go to the park ______ I finish my homework. 2. While I was waiting for the bus, I met an old friend.（简化从句） ______ ______ for the bus, I met an old friend. 3. We were having dinner. At that time they arrived.（合并为when复合句） We ______ ______ dinner ______ they arrived. 4. He began to learn English when he was six.（用since改写） He ______ ______ English ______ he was six. 5. The little boy didn’t go to bed until his mother came back.（同义句，用till改写肯定句） The little boy ______ ______ up till his mother came back. 6. As soon as she gets up, she reads English.（改为同义句） She reads English ______ she gets up. 7. By the time I got home, my dad had cooked supper.（对划线部分提问） ______ ______ your dad cooked supper? 8. While she was washing clothes, she listened to music.（同义替换as） ______ she ______ clothes, she listened to music. 五、短文语法填空 I still remember the trip to the countryside last summer. ______ (1) I was twelve, my parents took me to my grandma’s house. We set off early ______ (2) the sun rose. ______ (3) we were driving on the road, we saw many green trees. We didn’t stop the car ______ (4) we reached the small village. Grandma had prepared lots of fruit ______ (5) we arrived. She said she ______ (6) (prepare) them by the time we came. I have loved countryside life ______ (7) that trip finished. ______ (8) I am free on weekends, I will visit grandma again. As soon as the holiday ______ (9) (come), we will take the bus there. While ______ (10) (walk) around the fields, I can enjoy fresh air. By the time autumn ______ (11) (arrive), we ______ (12) (pick) plenty of fruit together. I won’t leave ______ (13) all the fruit is picked. As I ______ (14) (play) in the yard yesterday, grandma told me many old stories. I will keep these warm memories ______ (15) I grow up. 学科网（北京）股份有限公司 $ 沪教版（五·四学制）八年级上册Unit 1 Water 语法练习 答案及解析 一、单项选择 1. B 解析：as soon as 一……就，遵循主将从现。 2. C 解析：while后接过去进行时，搭配两个同时进行的延续性动作。 3. A 解析：not…until 直到……才。 4. C 解析：when引导短暂动作插入过去进行时背景。 5. C 解析：since是现在完成时标志。 6. D 解析：by the time 从句一般过去时，主句过去完成时。 7. B 解析：before 在……之前。 8. A 解析：主从句主语一致，while doing 简化从句。 9. A 解析：主句过去式，as引导同步过去动作。 10. B 解析：until 直到。 11. C 解析：not…until 固定搭配。 12. B 解析：when可搭配短暂性动词knock。 13. C 解析：since 自从，主句现完，从句一过。 14. B 解析：after 在……之后。 15. B 解析：两个动作同时发生只能用while。 二、用所给词适当形式填空 1. will call 解析：as soon as 主将从现。 2. was drawing 解析：while引导过去进行时。 3. has lived 解析：since主句用现在完成时。 4. started 解析：by the time从句用一般过去时。 5. clean 解析：until从句遵循主将从现，用一般现在时。 6. was walking 解析：as引导过去同步进行的动作。 7. While waiting 解析：主从句主语相同，简化从句。 8. was reading 解析：while后延续动作用过去进行时。 9. won’t go 解析：not…until 主句将来否定。 10. heard 解析：主过从过，as soon as 从句过去式。 11. was 解析：by the time从句一般过去时。 12. was walking 解析：when从句过去进行时，延续动作。 三、首字母填空 1. after 2. While 3. until 4. since 5. Before 6. After 7. By the time 8. As 9. While 10. when 四、句型转换 1. won’t; until 解析：not…until 同义替换after。 2. While waiting 解析：主从句主语一致，简化从句。 3. were having; when 解析：when搭配短暂动作arrived。 4. has learned; since 解析：since引导现完+一过结构。 5. stayed up 解析：till用于肯定句，主句延续性动词。 6. as soon as 解析：同义替换。 7. When had 解析：对by the time时间提问用when。 8. As; was washing 解析：as可替代while表示同步动作。 五、短文语法填空 1. When 解析：when 当……时，引导过去时间状语从句。 2. as 解析：as 随着，太阳升起时我们出发。 3. While 解析：while引导同时进行的延续动作。 4. until 解析：not…until 直到抵达村庄才停车。 5. before 解析：在我们到达之前奶奶准备好了水果。 6. had prepared 解析：by the time 主句过去完成时。 7. since 解析：自从那次旅行，我就喜欢乡村。 8. When 解析：when引导将来时间从句，主将从现。 9. comes 解析：as soon as 从句一般现在表将来。 10. walking 解析：while doing 简化从句。 11. arrives 解析：by the time从句一般现在表将来。 12. will pick 解析：by the time 主句将来时。 13. until 解析：直到水果全部摘完再离开。 14. was playing 解析：yesterday提示过去进行时。 15. until 解析：直到长大我都会珍藏回忆。 学科网（北京）股份有限公司 $