时间状语从句when whileas-2025-2026学年八年级英语下册语法考点精讲（沪外版）

8下沪外版 【寒假专版】 B版考点精讲 寒假专版 时间状语从句(when/while/as) 语法专项突破 考点精讲 考点一：when/while/.as引导时间状语从句时的基本含义及适用场景 规则：whn表示“当…时候”，既可指时间点也可指时间段，从句谓语动词可以是延续性或非 延续性动词：while表示“当…期间”，指时间段，从句谓语动词必须是延续性动词，且多与主句 动作同时进行；s表示“当…时”“一边…一边…”，强调主从句动作同时发生或伴随进行。 例题1：（选择，沪外初中期末真题改编）：I was doing my homeworkmy mother came back.A, when B.while C.asD.since(答案：A) 例题2：（选择）：my father was reading newspapers,.I was watching TV.A.When B.While C.As D.Before(答案：B) 考点二：when/while引导时间状语从句时主从句的时态搭配 规则：when/while引导时间状语从句时，若主从句动作同时进行且都用过去进行时，常用while 连接；若主句用过去进行时，从句用一般过去时（表示短暂动作打断延续动作），常用whn连接。 例题1： (语法填空)：While Tom_(play)basketball,he fell down and hurt his knee.(答案：was playing) 例题2：（选择）：I_TV when the doorbell rang.A.watch B.watched C.am watching D.was watching (答案：D) 考点三：while引导的时间状语从句的省略用法 规则：当while引导的时间状语从句中的主语与主句主语一致，且从句谓语动词含有be动词时， 可省略从句的主语和be动词，构成“while+现在分词/过去分词/形容词/介词短语”的结构。 例题1： (语法填空)：While_(tudy)in the library,we must keep quiet.(答案：studying) 例题2： (选择)：He likes listening to music while._exercise..A.doB.doing C.does D.todo(答 案：B) 考点四：when用作并列连词表示“这时/突然”的用法 8下沪外版 【寒假专版】 B版考点精讲 规则：when用作并s列连词时，常用于“be doing sth.when.”“be about to do sth.when.”“had just done sth.when.…”等结构中，表示“正在做某事/正要做某事/刚做完某事，这时突然…”。 例题1： (语法填空)：I was about to go outit began to rain heavily.(答案：when) 例题2： )They supper when the lights went out.A.had B.were having C.have had D.will have(答案：B) 考点综合训练 一、单项选择 1.We were playing soccer on the playgroundit started to rain.A.when B.while C.as D.since 2.my brother was doing his homework,I was listening to music.A.When B.While C.AsD.Before 3.She usually reads books she waits for the bus.A.when B.while C.as D.since 4.Idinner when my best friend called me.A.have B.had C.am having D.was having 5.He likes to listen to English songs he walks to school.A.when B.while C.as D.before 6.My father-newspapers while my mother was cooking.A.read B.reads C.was reading D.is reading 7.Theyabout their holiday plan when the teacher came in.A.talk B.talked C.are talking D.were talking 8.WhileTV,I heard a strange noise outside.A.watch B.watching C.watched D.to watch 二、语法填空 1.I was about to leave the housethe phone rang. 2.While she(walk)in the park,she met an old friend. 3.He always helps others_he is very busy. 4.My sister was listening to music I was doing my homework 5.While(study)English,we should practice speaking every day. 6.They(play)basketball when it began to rain heavily. 7.She sang happily-she was walking home. 8.I had just finished my homework my father asked me to go out. 三、句型转换 2 8下沪外版 【寒假专版】 B版考点精讲 l.Tom was reading a book when his mother came back.(对划线部分提问) 2.While Mary was listening to music,.she fell asleep.(改为同义句) 3.They were playing soccer on the playground.At that time,the bell rang.(合并为一句) 4.I was doing my homework.My brother was watching TV.(用while连接句子) 5.He was about to go to bed.The doorbell rang.(用when连接句子) 四、篇章填空 Last Sunday,I had a busy but happy day.In the morning,I was cleaning myroom 1.-my mother called me to help her cook breakfast.After breakfast,I started to do my homework.2.I was doing math exercises,my best friend Lily came to my house.She asked me to play outside.I said,"I will go with you 3.I finish my homework."She agreed to wait for me.4.we were playing basketball in the park,we met our classmate Tom.He joined us.We were having a good time 5.it suddenly started to rain.We had to run home quickly.Although we got wet,we felt very happy. 参考答案 一、单项选择 1.A2.B3.C4.D5.C6.C7.D8.B 二、语法填空 1.when 2.was walking 3.while 4.while 5.studying 6.were playing 7.as 8.when 三、句型转换 1.What was Tom doing when his mother came back? 2.Mary fell asleep while listening to music. 3.They were playing soccer on the playground when the bell rang. 4.While I was doing my homework,my brother was watching TV. 5.He was about to go to bed when the doorbell rang. 四、篇章填空 1.when 2.While 3.after 4.When 5.when 3