高中时间状语从句及练习
高中英语状语从句讲解与练习
高中英语状语从句讲解与练习高中英语状语从句一、时间状语从句1、when的用法（1）when既可引导一个持续性动作，也可引导一个短暂性动作，可用于表示主句和从句动作同时发生或从句动作先于主句动作，有时还可表示从句动作后于主句，意为“当……时候”。
（2）when在beabouttodo……when……，bedoing……when……，haddone……when……，beonone’sway……when……，beonthepointofdoing…when……等结构中作“那时突然”讲。
（3）when“既然、鉴于；尽管，虽然（位于主句之后）；如果”2、while的用法（1）则表示“当……时候”，鼓励的动作必须就是延续性的。
（2）用做同列连词，则表示相对关系“然而”。
（3）引导让步状语从句，相当于although,意为“虽然”，位于主句前。
（4）引导条件状语从句，相当于as/solongas，意为“只要”。
3、as的用法（1）则表示“当……时候”，特别强调同时出现，不所指先后。
（2）说明两种正在发展或变化的情况，表示“随着”，表示时间的推移。
（3）表示“一边……一边……”（4）强调两个动作紧接着发生。
（5）表示“虽然，尽管”（6）其他含义“正像，正如”，“做为”，“由于，因为”。
4、before的用法（1）一般意为“在……之前”“……才”，“……就”“还没有……”“免得”“不知不觉”“宁可，宁愿”，“否则，要不然”。
（2）itwillbe/was时间段before通常现在时/通常过去时。
在肯定句中，意为“多长时间之后才”；在否定句中，意为“用没法多长时间就”。
5、until和till（1）与肯定句连用，必须是延续性动词。
（2）与否定句属格，必须不为延续性动词，则表示“直至……才，在……之前不……”。
特别注意：notuntil可以用作特别强调句和倒装句强调句：itis/wasnotuntil…that…倒装句：notuntil放句首时，主句要部分倒装。
根据英语时间状语从句讲解及练习(简化版)
根据英语时间状语从句讲解及练习(简化版)一、什么是时间状语从句时间状语从句是由连词引导的从句，用来表示一个动作或状态发生的时间，它可以在句子中充当状语，起到修饰或限定其他句子成分的作用。
二、几种常见的时间状语从句及用法1. when当...时候例句：He was studying in the library when the earthquake happened.译文：地震发生时，他正在图书馆研究。
2. while当...的同时例句：I was cleaning the house while my sister was cooking.译文：我正在打扫房子，而我妹妹正在做饭。
3. as soon as一...就...例句：She called me as soon as she arrived home.译文：她一到家就给我打电话。
4. before在...之前例句：Please finish your homework before you go out to play. 译文：在你出去玩之前，请完成你的家庭作业。
5. after在...之后例句：He went to bed after he watched the movie.译文：他在看完电影之后上床睡觉。
6. until直到...例句：They played basketball until it got dark.译文：直到天黑之前他们都在打篮球。
三、时间状语从句练1. _______ he finishes his work, he will join us for dinner. （when）译文：当他完成工作时，他会加入我们共进晚餐。
2. I fell asleep _______ I was reading a book. （while）译文：我边看书边睡着了。
3. We will go shopping _______ the rain stops. （as soon as）译文：一雨停，我们会去购物。
时间状语从句讲解和练习(答案)
时间状语从句用句子表达一件事情或一个行为发生的时间，这个句子就叫时间状语从句。
时间状语从句根据其所表示的时间不同，所使用的连词也不同。
下面我们一起来看一下几个常见的时间状语从句：1. When引导的从句：表示主句的动作和从句的动作同时发生，或从句的动作发生在主句动作之前。
例如：I WaS goi ng OUt Whe n a ViSitor came.( 动词动作同时发生。
)我正要出门，有客人来访。
I shall tell her the good news Whe n She comes. 她来时，我将告诉她这个好消息。
小试牛刀：I found mother cooki ng for me. I got home.(when) _____________________________________ He WaS liste ning to the radio Whe n I ___________________ home. (get)2. while引导的从句：表示当……过程中”，强调某一段时间内主句和从句中谓语动词所表示的动作在同一时期发生。
由于while从句表示一个持续的行为，所以从句中要用持续性动词，并且持续性动词常用进行时态。
例如：KeeP an eye On my little SiSter while I am away. 我不在时，请照看一下我的小妹妹。
While We Were WatChing TV, Jim Came in. 我们看电视的时候，Jim 进来了。
小试牛刀：It Started to rai n. We Were playi ng football.(while) _____________________________________ LUCy WaS clea ning the room ________ Lily WaS liste ning to music.3. as引导的时间状语从句：表示当.... 的时候；一边... 一边.... ；随着.... ”，其从句的主语与主句的主语往往是同一人或物。
时间状语从句(含练习及答案)
以when 引导的时间状语从句- When I got home, my son had finished his homework. (主句动作发生在从句之前)- When(当...时候, 主语+did) we arrived, it was raining.- When(正当...时候，主语+be+doing) I was playing the computer games, my mum came in. - He is always nervous when he speaks to strangers.- I usually walk to school when it rains.以while 引导的时间状语从句- While I was reading, my brother was playing with his toy cars. (主从句子动作同时发生)- While/When/As he was studying in the library, I saw him. (表示一段时间时，while/when/as 可替换)while引导的从句的谓语动词必须是持续性动作:I saw him while(x) I was getting off the bus.(x)I saw him when/as I was getting off the bus.以as 引导的时间状语从句- He will grow wiser as he grows older. 随着年龄的增长，他会聪明起来。
（随着，表示时间的推移，这时，不用when/while）- He entered the room as/when/while the meeting was going on. 正当开会的时候，他走进房间。
以before引导的时间状语从句- He had washed his hands before he had dinner. (主句动作先于从句动作)- Please clean the house before you move in.以after 引导的时间状语从句- She went on holiday after she had taken the examination. (从句动作先于主句)- You can watch TV after you finish your homework.以since 引导的时间状语从句- She has been in the house since she came to the city. (主句完成时态，从句过去时)- I have taught them English since last year.以as soon as引导的时间状语从句- I will write to you as soon as I get to America. 我一到美国就会给你写信。
完整word版高中时间状语从句及练习
时间状语从句常见的从属连词有：(注意其汉语意义)when, while, as, before, after, since, until (till) once as soon as, the moment, the minute, immediately, directly, each/every time, the first time, the last time, next time, by the time,whenever等。
例如：Every/Each time I was in trouble, he would come to my help.I thought her nice and honest the first time I met her.注意：（1）when, while, as的区别：1)when引导从句时，主从句的动作有先有后，也可以同时进行,从句的动作可以是持续性的，也可以是短暂的。
如：When I got to the airport, the plane had already taken off. （主先从后）（短暂性）When I lived there, I used to go to the seaside on Sundays. (同时) （持续性）When the movie ended, the people went back. （从先主后）2)while侧重主从句动作的对比，且从句的动词必须是持续性的。
如：While we were chatting she was looking at the time table on the wall．3)as引导从句时侧重主从句动作同时或几乎同时进行，从句的动作可以是持续性的，也可以是短暂的。
如：Sometimes I watch TV as I am having breakfast．4）when和while还可以是并列连词，意思分别是“就在这时”，“然而”。
高中时间状语从句及练习(含答案)
状语从句状语从句在句中作状语，修饰主句中的动词、形容词或副词等。
状语从句放在主句之前时，常用逗号分开;放在主句之后，一般不用逗号。
状语从句按其意义和作用可分为时间、原因、地点、条件、让步、目的、结果、方式、比较等9种。
1.时间状语从句时间状语从句表示主句动作发生的时间，主要由when，while，as ; before, after; till (until); once, by the time, as soon as, no sooner ... than和hardly ... when及名词词组the moment等引导。
1) when“在……的时候”; while “在……期间”; as “正当……的时候”when意为“在……的时候”，强调“特定时间”。
When spring came, he felt like a trip.When he was eating his breakfast, he heard the doorbell ring.说明：连词when在状语从句中还有如下几种含义：①表示突然发生的事，含义为“（正在……时）忽然”。
I was just coming along to see you when I ran into Wilson.I had been working a couple of months when I had a letter from Jane.②表示过早发生某事，意为“（还没……）就”。
此含义有时可用before代替。
I hadn’t been reading for half an hour when I heard steps outside.我刚读了不到半个小时就听到外面有脚步声。
I had been there little more than a week when I set to work in earnest.③表示“在……的情况下”，常可译为“虽然”，“既然”，“如果”。
时间状语从句及其练习题
状语从句一、时间状语从句一、时间状语从句 1、 as soon as “一、、、、、、就、、、、、、”引导时间状语从句的连词有引导时间状语从句的连词有The moment immediately The minute directly He instant instantly No sooner than Hardly had sb , done done…… when ….did ….. Scarcely when The moment she comes, I’I’ll call you. ll call you. She left immediately the meeting was over. Hardly had he got off the bus when he heard a loud noise. 2、 when ,while , as 引导时间状语从句引导时间状语从句时间点时间点 段时间段时间 区 别 When 主从同时；先后主从同时；先后 While 主从同时主从同时 对比对比 As 主从同时主从同时（一边、、、一边）、一边）It was raining when we arrived. My mother came in when I was doing my homework. While /when I was doing my homework, my mother came in. I am safe while I am here. He hurried home, looking behind as he went. As I left the house, I forgot the key. 主从句时态主从句时态Will you please bring me your book when you come here tomorrow? I will go home when I have finished my work . When / while 连词引导并列句连词引导并列句Was/ were about to do …Was /were going to do …. Was/were on one ’s way …Was .were on the point of doing …. When …. Was/were doing Was/were doing……. (“这时” 表同时) Had done …Jasmine was holidaying holidaying with with with her her her family family family in in in a wildlife a wildlife park when she w as was was bitten bitten bitten on on on the the the leg leg leg by by by a a lion. ………….while .while ………….(.(“然而”“然而” 表反比) I do every single bit of housework while my husband Bob just does the dishes now and then. 3、before 引导时间状语从句引导时间状语从句1）“还没等”（谓语不用否定式）（谓语不用否定式）Before they got to the bus stop, the bus had gone. 2) “….. (之后)才/就”It was evening before we reached the little town of Winchester. 3)固定句型：固定句型： It will (not) be some time before …………do do …… It was (not) some time before ….did ….. It won ’t be long before …………dodo do............ It wasn ’t long before (i)did did…….. 4 . until /till （ till 不用于句首或强调句）不用于句首或强调句） 引导时间状语从句引导时间状语从句1）…..not ….until/till .until/till……直到……才 He didn ’t go to bed until he had finished his work 2) …...until …...until /till /till …..直到……为止为止We were told that we should follow the main road until we reached the railway station . 3)强调句式强调句式It is not until …that … It was not until midnight that he went back home after the experiment. 4) not until 放在句首时，主句半倒装。
(完整版)高中时间状语从句语法及练习
(完整版)高中时间状语从句语法及练习时间状语从句是一个复合句结构，用来表示时间关系。
在高中英语研究中，时间状语从句是一个重要的语法点。
本文将为你详细介绍高中时间状语从句的语法规则，并提供一些练题目。
一、时间状语从句的定义和用法时间状语从句是用来表示时间关系的从句，它可以在句子中充当状语。
时间状语从句通常使用连词来引导，常见的引导词有：when, while, before, after, as, since, until, etc. 时间状语从句可以出现在主句的前面或后面。
二、时间状语从句的语法规则1. 当主句的谓语动词表示将来时，时间状语从句中的谓语动词可以使用一般现在时代替一般将来时。
例：I will call you when I arrive home.（主句使用了将来时，从句中使用了一般现在时）2. 当主句的谓语动词表示过去时，时间状语从句中的谓语动词可以使用一般过去时或过去完成时代替。
例：She had finished her homework before she went to bed.（主句使用了过去时，从句中使用了过去完成时）3. 当时间状语从句表示一个惯性的动作或一个客观事实时，从句中的谓语动词可以使用一般现在时。
例：I always go for a walk when it is sunny.（从句中表示惯性的动作）三、时间状语从句的练题目1. 选择正确的连词填空：― She fell asleep _______ she finished her book.1) while 2) because 3) after― We will start the meeting _______ everyone ar rives.1) before 2) since 3) until2. 改写句子，将主句的谓语动词改为表示将来时：― I will call you when I have time.3. 改写句子，将主句的谓语动词改为表示过去时或过去完成时：― He went to bed before he finished his work.以上是关于高中时间状语从句的语法规则及练习题目的详细介绍。
完整版)高级时间状语从句语法及练习
完整版)高级时间状语从句语法及练习高级时间状语从句语法及练 (完整版)时间状语从句是句子中用来表示时间关系的从句。
它可以表达一个动作发生的时间、顺序或频率等。
在英语中，有许多种不同类型的时间状语从句，包括简单时间状语从句、连续时间状语从句、完成时间状语从句和未来时间状语从句等。
本文将详细介绍高级时间状语从句的语法和提供一些练来巩固研究。
1.完成时间状语从句完成时间状语从句表示一个动作在另一个动作之前发生或完成。
通常使用以下几个引导词：after。
before。
since。
as soon as。
once。
by the time等。
___。
I will go out to play.She had already left before I arrived.Since he ___。
___.As soon as I get home。
I will call you.Once you understand the concept。
it es easier.By the time he arrives。
the meeting will have already started.2.未来时间状语从句未来时间状语从句表示一个将来发生的动作或情况。
常用的引导词包括：when。
as soon as。
once。
until。
unless等。
When you come to the party。
please bring a gift.I will call you as soon as ___.Once you finish the project。
you can take a break.I won't go to bed until I finish reading this book.I won't go unless you come with me.3.连续时间状语从句连续时间状语从句表示两个动作或情况在时间上的连续关系。
时间状语从句+习题练习(含答案)
专题：时间状语从句1. 引导时间状语从句的连词在下列空格中填入适当连词。
1._________he comes tomorrow,I will ask where he has been.2._________he was speaking,everybody listened carefully.3.I saw her just now_________she was getting off the train.4.Have a good look at that man________you pass him.5.It was already eight o'clock_________we got there.6.I was about to go out_________a visitor came.7.We'll go to the country at the beginning of June,_________the summer harvest will start.8.He learned to speak German_________he was in Berlin.9.Henry is in charge of the office________Mr.Smith is away.10.I listen to the recorder_________I have time.11.He had learned Chinese_________he came to China.12._________the work was done,we sat down to sum up experience.13.I haven't seen him_________he moved to the other side of the town.14.I waited________ he came back.15.I didn’t recognize him________he took off his eyeglasses.16.She likes everything to be in place________she starts to work.17.The thieves ran away_________they caught sight of the police.18.They decided to go back home_________their money ran out.19.__________I get to the airport,I will phone you to pick me up.20.They were about to leave______it began to rain.Keys:1.When2.While/When3.as4.when/as5.when6.when7.when8.while9.whi le10.whenever11.before12.After13.since14.till/until15.until16.before17.as soon as18.before19.As soon as20.when。
（完整版）状语从句练习
（完整版）状语从句练习状语从句状语从句：指把一句子当着副词作状语时，修饰动词、或整个句子；根据它在句中的作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句；状语从句前一般由连词（从属连词）引导，也可以由词组引导。
它常位于句首；若位于句中，常用逗号与主句隔开；位于句尾时可以不用逗号隔开。
一、时间状语从句1. 通常由以下连词弓丨导：when / while / as/ after/ before/ as soon as/ since/ till /until / by the time2. 在时间状语从句中，要注意时态一致。
（主将从现）1）.when 当…..的时候: Mozart started writing music when he was four years old.2）.while 在…期间： He visited a lot of places while he was traveling.3）.as 在…的同时；一边…一边...: He smiled as he stood up.4）.after 在...之后: He left the classroom after he had finished his homework the other day.5）.before 在...之前Mr. brown had worked in a bank for a year before he came here.6）.as soon as 一...就... We bega n to work as soon as we got there. I will write to you as soon as i get home.7）.since 自...以来（至U现在） Mr green has taught in that school since he came to china three years ago.8）till /until 直至U : They walked till /until it was dark. Tom didn ' t leave home till / until his father came back.难点---- as/ when/ while的辨析as when while都表示主、从句动作同时发生，三者差异如下：as表示一边…一边"/随着，强调两个动作同时进行，I am cooking as I am singing.when 当…..的时候，从句动作可在主句动作"之前"或"之后"发生lit was raining hard when （as） i got there. 还可表and then; at that moment （正在那个时候/突然）：I am leaving for Beijing when the phone rang.while 在…期间从句动作为延续性动词或状态词I am cooki ng while I am si ngi ng然而（（表转折，对比）she thought I was talking about her daughter, while I was talking about my daughter.Mother was worried because little Alice was ill, especially as （when/ while） father was away.二、条件状语从句要点：状语从句由连词if （如果）、unless （=if not）（除非）弓I导。
（完整版）高中英语状语从句讲解及练习
（完整版）高中英语状语从句讲解及练习状语从句状语从句在句中作状语，可分为：时间、条件、让步、原因、目的、结果、比较、地点、方式状语从句。
一、时间状语从句引导时间状语从句的连词有：when, as, while, until, not?until, before, after, since,the minute, the moment, each( every, next, the first) time 等。
时间状语从句中一般用一般现在时或一般过去时。
1．When , while, as 都可解释为“当``` 的时候”但侧重点有所不同。
1)W henEg: When I arrived home , I had a little rest.注意点：when 从句的主语与主句主语相同，谓语动词是be 动词时，从句主语和be 可以省略。
Eg: When (she was) walking along the street, she met her class teacher.2)A sAs 除了表示“当``` 的时候”，还可表示为“一面```一面”，“随着” Eg: He sang as he danced一.（面```一面）You will grow wiser as you grow older.（随着）3）While 表示“当```的时候” 强调主句的动作和从句的动作同时发生，从句一般用进行时，从句动词必须是延续性动词。
Eg: While we were working, they were having a rest.While （they were）having a discussion, they got very confused.注意点：while 有对比的含义，解释为“然而” 。
eg: I prefer black tee,while he likes coffee. 2．until, not ?until 表示“直到```才” , 在肯定句中主句常用延续性动词；在否定句中主句常用短暂性动词。
高中英语时间状语从句结构练习题20题含答案解析
高中英语时间状语从句结构练习题20题含答案解析1.I was reading a book when he came in.A.whileB.as soon asC.sinceD.until答案解析：A。
“while”强调两个动作同时进行，这里“我在读书”和“他进来”是两个同时发生的动作；“as soon as”一……就……；“since”自从；“until”直到……才……。
2.She had just fallen asleep when the phone rang.A.asB.afterC.beforeD.when答案解析：D。
这里“had just fallen asleep”和“the phone rang”两个动作几乎同时发生，“when”可表示“这时，突然”；“as”当……的时候，强调伴随；“after”在……之后；“before”在……之前。
3.We will start our journey as soon as it stops raining.A.whenB.untilC.whileD.since答案解析：A。
“as soon as”一……就……，可以和“when”替换；“until”直到……才……；“while”强调两个动作同时进行；“since”自从。
4.I haven't seen him since he left for Beijing.A.whenB.asC.untilD.after答案解析：A。
“since”自从……以来，后面跟过去的时间点，主句用现在完成时；“when”当……的时候；“as”当……的时候，强调伴随；“after”在……之后。
5.The moment I saw him, I knew he was the one.A.as soon asB.whenC.whileD.until答案解析：A。
“the moment”一……就……，和“as soon as”意思相近；“when”当……的时候；“while”强调两个动作同时进行；“until”直到……才……。
高中英语时间状语从句结构练习题20题(答案解析)
高中英语时间状语从句结构练习题20题(答案解析)1.I was doing my homework ______ my mother was cooking.A.whenB.whileC.asD.since答案解析：B。
while 引导的时间状语从句强调两个动作同时进行，“我在做作业的时候妈妈在做饭”符合这个特点。
when 通常表示一个动作发生时另一个动作突然发生；as 强调两个动作同时进行且有伴随关系，此处while 更合适；since 表示“自从”，不符合语境。
2.______ I was walking in the park, I saw a beautiful bird.A.WhenB.WhileC.AsD.Since答案解析：A。
when 可以表示一个动作发生时另一个动作突然发生，“我在公园散步的时候看到一只漂亮的鸟”符合这个用法。
while 和as 强调两个动作同时进行；since 表示“自从”，不符合语境。
3.She was reading a book ______ he was playing games.A.whenB.whileC.asD.since答案解析：B。
while 强调两个动作同时进行，“她在读书的时候他在玩游戏”符合这个特点。
when 通常表示一个动作发生时另一个动作突然发生；as 强调两个动作同时进行且有伴随关系，此处while 更合适；since 表示“自从”，不符合语境。
4.______ the teacher was explaining the lesson, the students were taking notes.A.WhenB.WhileC.AsD.Since答案解析：C。
as 强调两个动作同时进行且有伴随关系，“老师在讲解课程的时候学生们在做笔记”符合这个特点。
when 通常表示一个动作发生时另一个动作突然发生；while 强调两个动作同时进行，此处as 更能体现伴随关系；since 表示“自从”，不符合语境。
高中英语时间状语从句表及时间状语从句练习题目
时间状语从句1. 常见的连词2. 主从句的时态时间状语从句练习一、单项选择。
1. ---Do you know when the train ?---At about 7:00 p.m. We’ll meet Miss Li here soon.A. leavesB. reachesC. gets toD. arrives2 I’ll tell you as soon as I the news.A. will getB. getC. gotD.am getting3. Can you finish the work before he tomorrow?No problem.A. will get hereB. come backC. leaves for ShanghaiD. will arrive4. It was raining I arrived at the station.A.asB. whileC. whenD. as soon as5. We in the forest last weekend when it began to rain.A. enjoyed campingB. were enjoying campingC. enjoyed to campD. were enjoying to camping6. They were playing on the computer their teacher came in .A. afterB. whenC. untilD. then7. My wife was watching TV while I on the Internet.A. searchB. was searchingC. searchedD. searching8. I’ll let you know Mary comes back.A.so soonB. untilC.as soon asD. while9. It heavily when I left the cinema.A. rainsB. will rainC.is rainingD. was raining10. Jane , please turn off the lights you leave the classroom.A. afterB. beforeC. untilD. but11.---The traffic is becoming worse and worse now.---That’s right. So always look both ways you cross the road.A. untilB. whileC. beforeD. after12. Tom will call me as soon as he home.A. getsB. has gotC. getD. will get13. It’s a serious problem .We can’t decide Mr. Green comes back.A. whileB.soC. untilD. after14. Many students didn’t realize the importance of study they left school.A. whenB. untilC.asD. after15.---It’s quite common in England to say “Thank you ” to the drivers people get off the bus.A.whileB.asC. whenD.after16. I'll write to your parents late again. Be late 主将从现A. if you will beB. if you are C if you would D. if you will not17. I go out when it began to rain.Was/were doing….when…was/were about to do …when…A. was toB. was about toC. am about toD. was going to18. I was about to go for a walk my uncle came.A.asB. whenC. whileD. and19. It’s raining outside. Do n’t leave _______ it stops. Not…untilA. whenB. sinceC. untilD. unless20. They observed the train it disappeared in the distance.A. untilB. unlessC. whenD. after21. This coat will lose its color it's washed.A. beforeB. afterC. unlessD. whoever22. We to see you when we our report.A. will go; will finishB. go; finishC. will go; finishD. go; have finished23.. I did n't understand it he had explained it to me.A. untilB. unlessC. whenD. while24.We were enjoying watching the football match on TVthe electricity went out. Go out 熄灭A.thenB.asC. whileD. when25.—What was the party like?—Wonderful! It's/has been years I enjoyed myself so much.A.afterB. when C .before D. since26. ____ the day went on ,the weather got worse.A. AsB. SinceC. whileD. When27. It ____ long before we know the result of the experiment.A. will be notB. isC. will not beD. was28. We have not seen each other ____I left London..A. asB. beforeC. sinceD. till29 . John thinks it won’t be long ___ he is ready for his new jobs.A. whenB. ifC. andD. before30. No sooner had I arrived home ____ it began to rain.A. whenB. whileC. asD. than二．用方框中所给单词或短语填空1.I’ll tell him about it when/as soon as he comes back.2.Mother was doing some cleaning while father was watching the football match .3.She danced as she sang.4.He waited for me until late at night.5.He couldn’t help crying when he hear d the bad news.Can’t/couldn’t help doing…禁不住。
时间状语从句讲解和练习(答案)
时间状语从句用句子表达一件事情或一个行为发生的时间，这个句子就叫时间状语从句。
时间状语从句根据其所表示的 时间不同，所使用的连词也不同。
下面我们一起来看一下几个常见的时间状语从句：1. when 引导的从句：表示主句的动作和从句的动作同时发生，或从句的动作发生在主句动作之前。
例如：I was going out whe n a visitor came.(I shall tell her the good n ews whe n she comes.小试牛刀：引导的从句：表示 当……过程中”，强调某一段时间内主句和从句中谓语动词所表示的动作在同一 由于while 从句表示一个持续的行为， 所以从句中要用持续性动词，并且持续性动词常用进行时态。
我不在时，请照看一下我的小妹妹。
While we were watching TV, Jim came in.我们看电视的时候， Jim 进来了。
小试牛刀：It started to rain. We were p lay ing football.(while) _____________________________________________________________________________Lucy was clea ning the room ____________________________ L ily was liste ning to music.3.as 引导的时间状语从句：表示 语往往是同一人或物。
例如： She sang as she worked.她一边工作一边唱歌。
=She was singing as she was work ing.I saw him as he was getti ng off the bus.正当他下公共汽车时，我看见了他。
小试牛刀： __________________ we walked, we talked.You will grow wiser ___________________________ you grow older.4.before 引导的从句：一般表示主句的动作发生在从句动作之前。
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时间状语从句常见的从属连词有：(注意其汉语意义)when, while, as, before, after, since, until (till) once as soon as, the moment, the minute, immediately, directly, each/every time, the first time, the last time, next time, by the time, whenever等。
例如：Every/Each time I was in trouble, he would come to my help.I thought her nice and honest the first time I met her.注意：（1）when, while, as的区别：1)when引导从句时，主从句的动作有先有后，也可以同时进行,从句的动作可以是持续性的，也可以是短暂的。
如：When I got to the airport, the plane had already taken off. （主先从后）（短暂性）When I lived there, I used to go to the seaside on Sundays. (同时) （持续性）When the movie ended, the people went back. （从先主后）2)while侧重主从句动作的对比，且从句的动词必须是持续性的。
如：While we were chatting she was looking at the time table on the wall．3)as引导从句时侧重主从句动作同时或几乎同时进行，从句的动作可以是持续性的，也可以是短暂的。
如：Sometimes I watch TV as I am having breakfast．4）when和while还可以是并列连词，意思分别是“就在这时”，“然而”。
如：I was having a rest on the sofa when the telephone rang．They were surprised that a child should work out the problem while they couldn’t .注：并列连词when常用与以下句型中：①…was/were doing…when…（正在做…突然）②…was/were about to do…when…（刚要做…突然）③…was/were on the point of doing…when…(刚要做…突然)④…had just done…when….(刚一…就)⑤Hardly/Scarcely had…done…when…(刚一…就)(2)before引导从句时,词义非常灵活，注意下列句子中的before的词义：I could get in a word, the tailor had measured me.(还没来得及…就)hadn’t run a mile before he felt tired.(还没…就)had sailed 4 days before we saw land.(…才…)write it down before you forget it.(趁还…没就)(3)till (until) 和not…till (until)1）till (until):主句谓语动词必须是持续性的，意思是“到…为止“如：He remained there till/until she arrived.2）not…till (until)…: 主句谓语动词必须是短暂性的，意思是“直到…才”如：She won’t go to bed till/until he returns home.3）not…until还有强调式和倒装式：强调句：It is not until he returns home that she will go to bed.倒装句：Not until he returns home will she go to bed.(4)几个极易混淆的时间状语从句：1）It was +时间点+when…（当的时候时间是）It was 5 am when we arrived at the village.2）It was/will be+时间段+before…(没过…就／过了…才)It was/will be two weeks before we met/meet again.3）It is /has been +时间段+since…（自从…以来有…）It is/has been 3 years since we last met.突破点：一看be动词的时态，二看时间段还是时间点。
注意：在“It is /has been +时间段+since…”句型中，从句的动词必须是短暂性的，如果是延续性的动词，时间要从从句的动作结束时算起。
如：It is 3 years since I smoked.( 我戒烟有三年了)补充：as soon as, immediately, directly, instantly, the moment, the minute, the instant, no sooner…than…, hardly/scarcely….when….和once这些从属连接词引导的从句都表示从句的动作一发生，主句的动作随即就发生，常译为“一…就…”。
从句中一般时态代替将来时态。
every time, each time, next time, the first time, any time, all the time等名词短语用来引导时间状语从句，表示“每当…..，每次…..；下次……”等。
练习题1. It was quiet ________ those big trucks started coming through the town.A. beforeB. afterC. untilD. unless2. It seemed only seconds ________ the boy finished washing his face.A. whenB. beforeC. afterD. even if3. Hardly had he reached the school gate ________ the bell rang.(A. whileB. whenC. asD. as soon aswere told that we should follow the main road _____ we reached the central railway station.A. wheneverB. untilC. whileD. wherever5. I recognized you ________ I saw you at the airport.A. the momentB. whileC. afterD. once6. He was about to go to bed ________ the doorbell rang.A. whileB. asC. beforeD. whenlisten to your advice, I get into trouble.A. Every timeB. WhenC. WhileD. Until8. _____ John was watching TV, his wife was cooking.<A. AsB. As soon asC. WhileD. Till9. The children ran away from the orchard(果园) ______ they saw the guard.A. the momentB. afterC. beforeD. as10. No sooner had I arrived home _____ it began to rain.A. whenB. whileC. asD. than11. Several weeks had gone by _____ I realized the painting was missing.A. asB. beforeC. sinceD. when12. It _____ long before we ____ the result of the experiment.A. will not be; will knowB. is; will knowC. will not be ; knowD. is; know13. –What was the party like【--Wonderful. It’s years _____ I enjoyed myself so much.A. afterB. beforeC. whenD. since14. The new secretary is supposed to report to the manager as soon as she_____.A. will arriveB. arrivesC. is going to arriveD. is arriving15. _____ got into the room _____ the telephone rang.A. He hardly had; thenB. Hardly had he; whenC. He had not; thenD. Not had he; when16. No sooner had he finished his talk _____ he was surrounded by the workers.A. asB. thenC. thanD. when17. –Did you remember to give Mary the money you owed her--Yes, I gave it to her _____ I saw her.^A. whileB. the momentC. suddenlyD. once18. I thought her nice and honest _____ I met her.A. first timeB. for the first timeC. the first timeD. by the first time19. He will have learned English for eight years by the time he _____ from the university next year.A. will graduateB. will have graduatedC. graduatesD. is to graduate20. The moment the 28th Olympic Games _____ open, the whole world cheered.A. declaredB. have been declaredC. have declaredD. were declared答案：CBBBA DACAD BCDBB CBCCD~。