初中英语时间状语从句讲解及练习
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。
初中英语状语从句讲解及练习.doc
初中英语之 --- 状语从句1时间状语从句：在一个句子中作时间状语的句子。
引导词:when（当…时候）while（当…时候）as（当…时候）after（在…以后）before（在…以前｝ as soon as（—…就｝ since（自从…到现在）till /until（直到…才｝by the time（到…为止）构成：引导同+陈述语序句子2原因状语从句：在一个句子中作原因语的句子，译作“因为”。
连接词:由连词because, s ince, as引导,也可由for引导。
举例：Ididn’ t go to school y esterday bee ause I was i II.3条件状语从句连接词:if如果,u nless （=if n ot＞除非。
（主将从现原则）举例：If it doesn ’ t rai n tomorrow,we will go h iking.4目的、结果状语从句目的状语从句是指在一个句子中充当目的状语的句子，译作“以此來.......”。
结果状语从句是指在一个句子中充当结果状语的句子，译作“所以......或者如此... 以致于”。
引导词：so that, s o…that, in order thatHe came early so that he c ould get a g ood seat.The boy is so I ittle that h e can't go t o school alo ne.5让步状语从句让步状语从句是指在句子中作让步的状语的句子连接词:though,although, e ven though,even if 译作“尽管 ...... ”举例：Altho ugh he is ri ch, he is no t happy.状语从句其它引导词1.时间状语从句常用引导词:when, as, while, as soon as, while，before,after, sine e , till,until 特殊引导同：.. ... 就... ：the minute, the moment, the second，eg: The moment she s aw the littl e dog, she f ell in love with it.每次... :every timel didn’t real ize how spec ial my mot he r was until I became anadult.While John was wat ching TV, hi s wife was c ooking.The c hildren ran away from th e orchard （果园）the moment they saw the guard.Ever y time I listen to your advice, I get into trouble.2.地点状语从句常用引导同：where特殊引导同：whereve r无论哪里，anywhere 任何地方，everywhere 每个地方A new scho ol will be b uilt where i t was a shop ping center.Wherever yo u go, you sh ould work hard.状语从句练习单项选择1.John does n't letever ybodyinthe kitchen __________ h e could makehis sur prisedinner fortheparty.A. which B. when C. so that D. as if 2.I wouldt hankit __________ you call back this a fternoon for the doctor5 smeeting.A.until B. if C. when D. that3.Asfar as Iam concerned （就我而言），education is about learning and the more you learn,—____ A. the betterlife will you get B. the betterlife you will ge tC. you will get the bet ter lifeD.will you get the bet ter life4.Af ter the war, a new school wasbuilt _____________ t here had once be en（曾经有）a theatre.A. that B. where C . which D. whe n5.—Is Mr.Smith in the office?—Yes , __________ he is in charg e of the office, he mustbe there.A.since B. how ever C. whether D. for 6.As your good friendJ will do ____________help you.A. that I can to B. what I canto C. all that I can D. what I can7.Someone called me up in the middle ofthe night, b ut they hung up（挂断电话）____________ I coul d answer the phone.A.as B.since C. until D. before8.We must hurry up __________catchup with the last train.A. that B. so that to C. in order that D. in ord er toLondon 9.No m atter ________ h ard it ma y be, I will carry it out .A. what B. whatev er C.how D. however 1 0. _________you may do, you must do itwell.A. Which B.Whenever C. What ever D.WhenM. ________ you are so weak, you’d better sta y at home.A.Since B. For C. B ecause D. Though 1 5.1saw Mr.Smith last S unday. We had not seen each other ____________ I left .A. as B. before C.since D. till 16.1’11 be back before you ________ .A.will leave B will have left C.leave D. would lea vel7.If the weather ____________ tomor row, we will go picnic i n the centra 1 park.A wil 1 be fine Bis fine Cis going to be fine D h ave been fine18. ________________________ They wen t on working it was late at night.A. eve n if B.as if C. however D. as tho ughl9.l hurr ied _____________ I wouldn't b e late for c lass.A. sine e B. sotha t C.as if D . unless20.T he volleybal I match will be put off if it __________ .A. will r ain B. rain s C. r ained D. is raining【实例解析】1.（2004年北京市海淀区中考试题）You will sta y healthy ________ you do more exerci se, such as running and walking.A.ifB. howC. beforeD. where2.（2004年江丙省中考试题）…Shall we go on wor king?Ye s, _________ I prefer to have a rest.A. whenB. ifC. be causeD. th ough3.（2004年徐州市中考试题）N one of us kn ew what had happened ___________ they told us abo ut it.A. w henB. unti IC. afterD. though4.（2004年泉州市中考试题）••-1 ho pe you’ll en joy your tri p, dear!—Thank you,mum. Til gi ve you a cal I ___________ I get there.A. untilB. as soon a sC. sinceD. till【中考演练】一.单项填空1. ______ he z s old, he c an still car ry this heav y bag.A. T houghB. Si neeC. ForD. So2.•■-Do you know if he ______ to play ba sket ball wi th us?---1 think he wi II come if h e _______ fre e tomorrow.A. comes; i sB. comes;will beC.will come;isD. will come; will b e3.In the z oo if a chil d _____ into the water a nd can't swi m, the dolph ins may come up _________ him.A. will fall; to he IpB. fall s; to helpC. will fall; help D . falls; hel ping4.1don z t remember _________ he worked in th at city when he was youn g.A. whatB. which C . where D.who5.We wil I stay at ho me if my aunt __________ to visit us t omorrow.esB. c omeC. will comeD. is coming6.Th e police ask ed the child ren _______ cross the st reet _________ the traffi c lights tur ned green.A. not; befo reB. don't; whenC. n ot to; untilD. not; af ter7.1was late for cla ss yesterday ________ t he re was somet hing wrong w ith my bike.A. when B . that C. u ntil D. bee ause8.I’ll go swimming with you if I _________ f ree tomorrow .A. will b eB. shall beC. am D . was9.In t he exam, the ________ yo u are, _______ the ________ mistakes y ou will make .A. carefu I; littleB. more ca reful; fewes tC. more c areful; fewe rD. more c a ref u I; less10.You shou Id finish yo ur lessons _______ you g o out to pal y.A. beforeB. afterC. whenD.while11.1hurried _____ I wouldn't be late for class.A.sinceB. s o thatC. a s ifD. uni ess12.When you read the book, you'd better make a mark ________ you have any questio ns.A. whi chB. thatC. where D . though13.The teacher raised his v oice ________ a ll the stu dents could hear him.A. forB. s o thatC. b ecauseD. i n order14.H e took off h is coat ________ h e felt hot.A. be causeB. asC. ifD.since15.It is ______ th at we'd like to go out f or a walk.A. a lovely dayB. t oo lovely a dayC. so lovely a dayD. such Io vely a day16 . Mary had _______ m uch w ork to do th at she staye d at her off ice all day.A. suchB.soC. tooD. very17.______ I fel t very tired , I tried to finish the work.A. AlthoughB.BecauseC.AsD. As if18.______ t he day went on, the weat her got wors e.A. WithB. SinceC. WhileD.As19.______ well you c an drive, yo u must drive carefully.A. So long asB.ln order tha tC. No ma tter how D . The momentBeijing20. Write to me as soon as you _________ to.A . will get B. get C. g etting D. g ot二.根据中文意思完成下列英语句子1.不管他跟我开什麽玩笑，我都不生气。
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。
英语时间状语从句讲解与练习(完整版)
英语时间状语从句讲解与练习英语时间状语从句讲解与练习when, while 和 as 引导时间状语从句的用法这三个词的意思很简单，都有“当……时候”的意思。
但学生经常会问三个词的区别在哪儿，特别是在做选择题的时候。
别说是学生，就我个人而言，做这样的选择题要保证百分之百的正确也是不可能的。
现根据大量的实例和个人的思考，做一点小结，供大家参考。
一、when 的用法如果只从现象来看，when 从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定。
1. When he was a child he was always trying out new ideas. 他小时候就常常试验一些新的设想。
2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。
3. Were you writing when the teacher came in 老师进来的时候，你在写信吗？4. Sorry, I was out when you called me. 对不起，你打电话来的时候我出去了。
5. He was on the point of leaving when someone knocked at the door. 他正要走，这时有人敲门。
6. I thought of it just when you opened your mouth. 就在你要说话的时候，我也想到了。
7. I had hardly[scarcely] closed my eyes when someone knocked at the door. 我刚一闭上眼，就有人在敲门了。
根据以上的例句，我们可以总结出一点：when 从句的A事件，相当于另一个事件B发生的时间点。
也就是说，when 从句的重点不在动作本身发生的状态，而只是把它作为一个时间点，所以when 多数情况下用的是一般过去时，则不用正在进行时。
(完整版)初中状语从句讲解及习题附答案
（一）状语从句概述（二）状语从句详解1.时间状语从句2.地点状语从句3.条件状语从句4.原因状语从句5.目的状语从句6.结果状语从句7.让步状语从句8.比较状语从句9.方式状语从句练习一一. 单项填空1.he’s old, he can still carry this heavy bag.A.ThoughB. SinceC. ForD. So2.---Do you know if he to play basketball with us?---I think he will come if he free tomorrow.es; isB. comes; will beC. will come; isD. will come; will be3.In the zoo if a child into the water and can’t swim, the dolphins may come up him.A.will fall; to helpB. falls; to helpC. will fall; helpD. falls;helping4.I don’t remember he worked in that city when he was young.A.whatB. whichC. whereD. who5.We will stay at home if my aunt to visit us tomorrow.esB. comeC. will comeD. is coming6.The police asked the children cross the street the traffic lights turned green.A.not; beforeB. don’t; whenC. not to; untilD. not; after7.I was late for class yesterday there was something wrong with my bike.A.whenB. thatC. untilD. because8.I’ll go swimming with you if I free tomorrow.A.will beB. shall beC. amD. was9.In the exam, the you are, the mistakes you will make.A.careful; littleB. more careful; fewestC. more careful; fewerD. more careful; less10.You should finish your lessons you go out to play.A.beforeB. afterC. whenD. while11.I hurried I wouldn’t be late for class.A.sinceB. so thatC. as ifD. unless12.When you read the book, you’d better make a mark you have any questions.A.whichB. thatC. whereD. though13.The teacher raised his voice all the students could hear him.A.forB. so thatC. becauseD. in order14.He took off his coat he felt hot.A.becauseB. asC. ifD. since15.It is that we’d like to go out for a walk.A.a lovely dayB. too lovely a dayC. so lovely a dayD. suchlovely a day16.Mary had much work to do that she stayed at her office all day.A.suchB. soC. tooD. very17.I felt very tired, I tried to finish the work.A.AlthoughB. BecauseC. AsD. As if18.the day went on, the weather got worse.A.WithB. SinceC. WhileD. As19.well you can drive, you must drive carefully.A.So long asB. In order thatC. No matter howD. The moment20.Write to me as soon as you to Beijing.A.will getB. getC. gettingD. got二. 根据中文意思完成下列英语句子1.不管他跟我开什么玩笑，我都不生气。
(完整版)初中时间状语从句语法及练习(全)
什么是状语：句子中修饰动词、形容词等的句子成分叫状语，用来从地点、时间、原因、目的、结果、条件、让步、比较、方式和伴随状况等方面修饰说明谓语。
e.g. He speaks English very well（. 副词作状语）e.g. He is playing under the tree（. 介词短语作状语）e.g. I come specially to see you（. 不定式作状语）e.g. If I am not busy tomorrow,I will play football with you. （从句作状语）e.g. Having had a quarrel with his wife,he left home in a bad tempe（r. 分词作状语）状语从句：状语从句就是在复合句里起状语作用的从句，可以表示时间、地点、原因、目的、结果、让步、比较、方式、条件等。
引导状语从句的连词叫做从属连词。
状语从句的位置可以在句首，也可以在句末。
放在句首时，从句后面常用逗号与主句隔开；放在句末时，从句前面往往不用逗号。
If it ' s fine tomorrow, I lw gilo with you.I will go with you if it ' s fine tomorrow.状语从句分类：1、时间状语从句2、地点状语从句3、原因状语从句4、目的状语从句5、结果状语从句6、条件状语从句7、让步状语从句8、比较状语从句9、方式状语从句时间状语从句从属连词：when, while, as, before, after, till/until, since, whenever, as soon as（就）⋯⋯时态：主将从现，主情从现，主祈从现、When/while/as （当⋯时候）区别：主句动作与从句动作发生的时间（同时/之前/之后）；从句动词（延续性/瞬时性）1）When:when 引导时间状语从句时表示“当⋯⋯的时候”，when既可以指时间段也可指时间点，从句中既可用延续性动词又可用瞬间性动词，且动作既可和主句的动作同时发生又可在主句的动作之前或之后发生。
中考英语语法专题 时间状语从句讲解+练习
时间状语从句常用引导词：when, while, as, as soon as, before, after, till/until, since1、when, while, as（1）三者均可表示“当……时候”，如果主句表示的是短暂的动作，而从句表示的是一段时间，三者可通用。
如：I met Kang Li while/when/as I was walking along the street．当我沿街散步时碰见了康丽。
Don’t make any noise while/when/as I am recording. 我录音时（你们）别发出声音。
（2）while1）while只能与持续性动词连用，且常用进行时态。
表示主句的行为在从句行为进行的过程中发生。
如：While they were crossing the Atlantic, many people died. 他们中的很多人在横渡大西洋时丧生了。
2）表示主句和从句的动作同时发生。
如：While the wife was cooking, the husband was watching TV. 妻子在做饭的时候，丈夫在看电视。
3）表示“然而”，主句和从句是两个对应的动作。
如：Lucy likes dancing while Lily likes doing sports. 露西喜欢跳舞而莉莉喜欢运动。
（3）when1）when既可以和持续性动作连用，也可以和瞬间性动作连用，主句与从句描述的动作既可以同时发生，也可以先后发生。
如：When the weather is fine, many people go out for a walk. 天气好时，很多人都出去散步。
When I got home, I found my baby girl singing in the sitting room. 我到家时，发现我的小女儿正在客厅里唱歌。
英语时间状语从句讲解与练习(完整版)
英语时间状语从句讲解与练习英语时间状语从句讲解与练习when, while 和as 引导时间状语从句的用法这三个词的意思很简单，都有“当……时候”的意思。
但学生经常会问三个词的区别在哪儿，特别是在做选择题的时候。
别说是学生，就我个人而言，做这样的选择题要保证百分之百的正确也是不可能的。
现根据大量的实例和个人的思考，做一点小结，供大家参考。
一、when 的用法如果只从现象来看，when 从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定。
1. When he was a child he was always trying out new ideas.他小时候就常常试验一些新的设想。
2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。
3. Were you writing when the teacher came in? 老师进来的时候，你在写信吗？4. Sorry, I was out when you called me. 对不起，你打来的时候我出去了。
5. He was on the point of leaving when someone knocked at the door.他正要走，这时有人敲门。
6. I thought of it just when you opened your mouth. 就在你要说话的时候，我也想到了。
7. I had hardly[scarcely] closed my eyes when someone knocked at the door.我刚一闭上眼，就有人在敲门了。
根据以上的例句，我们可以总结出一点：when 从句的A 事件，相当于另一个事件B发生的时间点。
也就是说，when 从句的重点不在动作本身发生的状态，而只是把它作为一个时间点，所以when 多数情况下用的是一般过去时，则不用正在进行时。
初中英语语法：时间状语从句解析和练习题(含答案)
2021年初中英语语法：时间状语从句解析和练习题(含答案)在句子中起时间状语作用的句子称为时间状语从句。
时间状语从句可以放在句首、句中和句尾。
引导时间状语从句的词有when、while、as、before、after、since、until/till、as soon as、once、each time、next time、the moment、immediately、instantly等。
（一）when引导的时间状语从句1）when意为“当......时”，引导时间状语从句，表示主句的动作和从句的动作同时或先后发生例句：Faith is the bird that feels the light when the dawn is still dark. 信念是黎明前的黑夜里能感受到光明的鸟儿。
例句：When I was wandering in the street, I met her. 我在街上徘徊的时候遇到了她。
2）when引导的时间状语从句中的动词可以用延续性的=动词，也可以用终止性动词例句：He was listening to the music when I went in. 当我进去的时候，他正在听音乐。
例句：I will visit my parents when I have time. 我有空时会去看望我的父母。
（二）while引导的时间状语从句While引导的时间状语从句，常译为“与......同时，在......期间”，while引导的从句常用延续性动词或表示状态的动词。
例句：They rushed in while we were discussing problems. 当我们正在讨论问题时，他们冲了进来。
例句：Make hay while the sun is shining. （谚）趁热打铁。
（三）as引导的时间状语从句As引导的时间状语从句，可以表达“正当，一边一边，随着”等意思。
英语时间状语从句讲解与练习(完整版)
英语时间状语从句讲解与练习英语时间状语从句讲解与练习when, while 和 as 引导时间状语从句的用法这三个词的意思很简单，都有“当……时候”的意思。
但学生经常会问三个词的区别在哪儿，特别是在做选择题的时候。
别说是学生，就我个人而言，做这样的选择题要保证百分之百的正确也是不可能的。
现根据大量的实例和个人的思考，做一点小结，供大家参考。
一、when 的用法如果只从现象来看，when 从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定。
1. When he was a child he was always trying out new ideas.他小时候就常常试验一些新的设想。
2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。
3. Were you writing when the teacher came in? 老师进来的时候，你在写信吗？4. Sorry, I was out when you called me. 对不起，你打电话来的时候我出去了。
5. He was on the point of leaving when someone knocked at the door.他正要走，这时有人敲门。
6. I thought of it just when you opened your mouth. 就在你要说话的时候，我也想到了。
7. I had hardly[scarcely] closed my eyes when someone knocked at the door.我刚一闭上眼，就有人在敲门了。
根据以上的例句，我们可以总结出一点：when 从句的A事件，相当于另一个事件B发生的时间点。
也就是说，when 从句的重点不在动作本身发生的状态，而只是把它作为一个时间点，所以when 多数情况下用的是一般过去时，则不用正在进行时。
初中英语状语从句讲解、练习与答案
状语从句状语从句用来修饰主句中的动词，副词和形容词的从句叫状语从句。
根据其含义状语从句可分为时间状语从句，地点状语从句，条件状语从句，原因状语从句，结果状语从句，比较状语从句，目的状语从句，让步状语从句。
1. 时间状语从句(1)时间状语从句常用when, as, while, before, after, since, till, until, as soon as等连词来引导。
例如：It was raining hard（rain hard 下大雨）when got to school yesterday.While he was doing his homework, the telephone rang.As he walked along（沿着走）the lake, he sang happily.He had learned a little Chinese before he came to China.After he finished middle school, he went to work in a factory.(2)在时间状语从句里，通常不用将来时态，用现在时态表示将来的动作或状态。
例如：I’ll ring you up as soon as I get to New York.I will tell him everything when he comes back.He won’t believe it until he sees it with his own eyes.(3)在带有till或until引导的时间状语从句的主从复合句里，如果主句用肯定式，其含义是“一直到……时”，谓语动词只能用延续性动词。
如果主句用否定式，其含义是“直到……才……”, “在……以前不……”, 谓语动词可用瞬间动词。
例如：The young man read till the light went out（熄灭）.Let’s wait until the rain stops.We won’t start until Bob comes.Don’t get off（从下来）until the bus stops.【Till是指直到某一特定事件发生的时候，而在那个时刻之后，该事情或状况仍将持续。
初中时间状语从句语法及练习
初中时间状语从句语法及练习英语时间状语从句讲解与练习（一）when, while 和as 引导时间状语从句的用法一、when 的用法如果只从现象来看，when 从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定。
1. When he was a child he was always trying out new ideas.他小时候就常常试验一些新的设想。
2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。
3. Were you writing when the teacher came in? 老师进来的时候，你在写信吗？4. Sorry, I was out when you called me. 对不起，你打电话来的时候我出去了。
5. He was on the point of leaving when someone knocked at the door.他正要走，这时有人敲门。
6. I thought of it just when you opened your mouth. 就在你要说话的时候，我也想到了。
7. I had hardly[scarcely] closed my eyes when someone knocked at the door.我刚一闭上眼，就有人在敲门了。
根据以上的例句，我们可以总结出一点：when 从句的A事件，相当于另一个事件B发生的时间点。
也就是说，when 从句的重点不在动作本身发生的状态，而只是把它作为一个时间点，所以when 多数情况下用的是一般过去时，则不用正在进行时。
因为如果用正在进行时，它表示的就是一段时间而不是一个时间点了。
根据这一点，有的文章补充说：when 从句的动词大多是瞬时动词。
这种说法也可以参照。
实际上，when 从句也可以有其它的时态，但几乎也不用进行时，因为它也只是作为一个时间参照点。
英语时间状语从句讲解与练习(完整版)
英语时间状语从句讲解与练习英语时间状语从句讲解与练习when, while 和as 引导时间状语从句的用法这三个词的意思很简单，都有“当……时候”的意思。
但学生经常会问三个词的区别在哪儿，特别是在做选择题的时候。
别说是学生，就我个人而言，做这样的选择题要保证百分之百的正确也是不可能的。
现根据大量的实例和个人的思考，做一点小结，供大家参考。
一、when 的用法如果只从现象来看，when 从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定。
1. When he was a child he was always trying out new ideas.他小时候就常常试验一些新的设想。
2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。
3. Were you writing when the teacher came in? 老师进来的时候，你在写信吗？4. Sorry, I was out when you called me. 对不起，你打电话来的时候我出去了。
5. He was on the point of leaving when someoneknocked at the door.他正要走，这时有人敲门。
6. I thought of it just when you opened your mouth. 就在你要说话的时候，我也想到了。
7. I had hardly[scarcely] closed my eyes when someone knocked at the door.我刚一闭上眼，就有人在敲门了。
根据以上的例句，我们可以总结出一点：when 从句的A 事件，相当于另一个事件B发生的时间点。
也就是说，when从句的重点不在动作本身发生的状态，而只是把它作为一个时间点，所以when 多数情况下用的是一般过去时，则不用正在进行时。
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语法 29时间状语从句
一、什么是状语从句
状语就是在一句话中表示该句子的时间、地点、方式、原因、条件等成分。
状语从句就是用一个从
句表示状语。
状语从句根据它表达的意思不同，可分为时间、地点、原因、目的、结果、条件、方式、比较、让步等九类。
与状语一样，状语从句的位置比较灵活。
既可置于主句之前（通常用逗号与主句隔开），也课置于主句之后（不需要用逗号与主句隔开），有时甚至可以置于主句之中。
二、时间状语从句
1. 主句和从句同时发生，这类从句由从属连词when, while, as引导。
He was hungry when he came home.
I was crying while everyone was laughing.
As I walked out, he walked in.
as, when, while, 的区别
① as强调从句的动作与主句动作同时发生及持续，具有at the same time的意思
他继续往下谈的时候，越来越兴奋。
as还可以表示一边⋯⋯一边⋯⋯，强调从句和主句中两个动作交替进行或同步进行。
他们边走边聊。
as还有“ 随着”的含义
随着春天的到来，天气暖和起来。
② when 强调动作点的特定时间，具有at the time that 的意思
当老师走进来的时候，我们都站起来了。
③ while 表示较长的期间，具有during the time that 的意思
当我在这的时候，我很安全。
2.主句发生在从句之前，这类从句由从属连词before, until 引导 ,before 意为“ 在---之前”
until
在肯定句中意为“直到 --- 为止”，在否定句中意为“直到 --- 才”。
从句既可置于主句前，也可置
于主句之后。
回家之前我必须干完所有的活。
我们将一直等到他回来。
他直到晚上 11 点才回家。
3.主句发生在从句之后，这类从句由从属连词after 引导，意为“在---之后”。
从句既可置于主
句前，也可置于主句之后。
放学后我们踢足球吧。
4.主句在从句之后立刻发生，这类从句由从属连词 once, as soon as引导，意为“刚刚”，“一---
就---”。
从句既可置于主句前，也可置于主句之后。
他
一有空就来看你。
一有消息，我就打电话给你。
三、 if 引导的条件状语从句。