时间状语从句和省略
英语语法：状语从句归纳整理
状语从句在复合句中，充当状语的从句叫作状语从句，一般修饰谓语动词或整个主句。
状语从句一般可分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、结果状语从句、条件状语从句、让步状语从句、比较状语从句和方式状语从句等。
一、时间状语从句在复合句中起时间状语作用的从句称为时间状语从句，可放在句首、句中或句尾。
（二）until 和 till的用法1.肯定句：主句的谓语动词必须是延续性动词，主句、从句都为肯定式，意为“直到……为止”；2.否定句：主句的谓语动词必须是非延续性动词，从句为肯定式，表示“某动作直到某时才开始”；3.till 不可以置于句首，而until可以。
例：They waited till / until I returned.他们一直在等我回来。
You may stay here until / till the rain stops.你可以待在这里直到雨停。
He won’t go to bed until / till she returns.直到她回来，他才上床睡觉。
Until you told me I had no idea of it.直到你告诉我，我才知道这件事。
（三）since的用法（四）before的用法一般情况下before表示“在……之前”，有时根据上下文，还可表示“还未……就……” “不到……就……” “……才……” “趁……还未……”等例：Please write it down before you forget it.趁你还没忘，请把它记下来。
I must finish this letter before I go home.我必须在回家之前完成这封信。
Before I could get in a word, he had measured me.我还没来得及插话，他就给我量好了尺寸。
We had sailed four days and four nights before we saw land.我们航行了四天四夜才看到陆地。
时间状语从句(完整版)
……………………………………………………………最新资料推荐…………………………………………………引导时间状语从句的五类引导词一．引导时间状语从句的从属连词(以下称引导词)很多，为方便记忆，现作以下分类：1. 基本类包括before, after, when, while, as, since, till, until, once, as soon as 等。
如：Did anyone call when I was out? 我不在家时谁来过电话吗?We have known each other since we were children. 我们从小认识。
You’ll feel better after you take the pills. 吃完药丸后你会感到好一些。
Make sure that all the lights are off before you go to bed. 睡觉前一定要关灯。
Don’t promise him anything till we’ve had time to think about it.在我们有时间考虑之前别答应他什么。
2. 名词类即由名词词组充当引导词，包括the moment, the minute, the second, the instant 等(均表示“一……就……”。
如I loved you the instant (that) I saw you. 我一见到你就爱上你了。
Tell me the moment (that) you get the results. 你一拿到结果就给我打电话。
3. 副词类即由副词充当引导词，如immediately, directly, instantly等。
如：I came immediately you called. 你一打电话我就来了。
Directly I walked in the door I smelt smoke. 我一进门就闻到烟味。
时间状语从句的用法归纳总结
时间状语从句的用法归纳总结时间状语从句是一个从句，通常用来陈述一个动作或事件发生的时间。
下面是时间状语从句的用法的归纳总结：1. 时间状语从句通常以连词引导，常见的连词有：when, while, as, before, after, since, until, as soon as, once等。
例句: She arrived when the party started. (当派对开始时，她到达了。
)I will call you as soon as I finish work. (我下班后会立即给你打电话。
)2. 当主句和从句的动作同时发生时，使用连词when或while引导时间状语从句。
例句: I was studying when the phone rang. (电话响时我在学习。
)He was watching TV while his mother was cooking. (他妈妈在做饭的时候他在看电视。
)3. 当主句的动作在从句的动作之前发生时，使用连词before, after或once引导时间状语从句。
例句: She left before I arrived. (我到达之前她离开了。
)After he finished his homework, he went out to play. (他做完作业后出去玩。
)Once you finish your dinner, you can have dessert. (一旦你吃完晚饭，就可以吃甜点了。
)4. 当主句的动作在从句的动作之后发生时，使用连词since或until引导时间状语从句。
例句: I have been working since I graduated from college. (我从大学毕业以来一直在工作。
)She will wait until you come back. (她会等到你回来。
)5. 时间状语从句中的谓语动词的时态与主句的谓语动词时态有一定的关系：- 如果主句是一般现在时态，从句可以是一般现在时、一般过去时或一般将来时。
_Itbe_时间_when_be_省略__since_that_句型辨析_吴元培
一、“It was+具体的时间点+when...”表示“当某事发生时，是几点钟或哪一年”。
此句是由when 引导的时间状语从句，而不是由when 引导的定语从句。
（2010年四川卷）Because of the heavy traffic ，it was already time for lunch break ______she got to her office.A.sinceB.thatC.whenD.until 解析在“It+is/was+具体的时间点+when...”这一结构中，主句中的it 指时间，由when 来引导这个时间状语从句。
常译为“当……的时候，是什么时间”。
所以选择C 项。
二、“It+will/would be+时间段+before...”句型中，表示“要过多久才……”，也可用于“It+may be+时间段+before...”，表示“也许要过多久才……”。
其否定形式“It will/would not be+时间段+before...”表示“没过多久（多长时间）就……”。
（1）（2008年北京卷）I ’m sorry you ’ve been waiting so long ，but it ’ll still be some time ______Brian get back.A.beforeB.sinceC.tillD.after 解析此句是由before 引导的时间状语从句，构成“It will be/was+一段时间+be -fore...”，主句中的谓语动词用肯定式时，意思是“……多久后（某人）才……”。
所以选择A项。
（2）（2010年陕西卷）John thinks it won ’t be long ______he is ready for his new job.A.whenB.afterC.beforeD.since 解析此句是由before 引导的时间状语从句，构成“It+won ’t be+时间段+状语从句”，如果主句的谓语动词是否定式时，意思是“……没过多久就……”。
时间状语从句
时间状语从句时间状语从句就是在复合句中表示主句动作发生时间的状语从句。
时间状语从句是所有状语从句中用得最经常的一种，并且用于引导时间状语从句的引导词也比较多,在学习时间状语从句时最重要的是记住这些引导词有哪些，它们的意思怎样等。
到底时间状语从句可以用哪些词来引导呢?请看下文：１．用wheｎ引导:ｗhen表示“当……时候”。
如：Things were differｅnt when I was a child. 我小时候情况与现在不同。
People bｒeatｈｅmｏreｓｌｏwlｙwhｅn tｈｅy ａre ａslｅｅp. 人睡觉时呼吸比较缓慢。
2. 用wｈｉｌｅ引导：ｗｈｉle表示“当……时候”。
如:We mustｓtrikｅwhile the iron is hot. 我们要趁热打铁。
I went swimmｉnｇwｈiｌe thｅoｔｈｅrs playeｄtｅnｎiｓ.我去游泳,其余的人都打网球去了。
注意:ｗhiｌe 所引导的时间状语从句中谓语动词必须是持续性的,不能是短暂性的。
3. 用as引导:aｓ表示“当……时候”“随着”。
如:He dｒopｐｅd tｈeｇｌasｓas ｈe ｓtｏodｕｐ．他站起来时，把杯子摔了。
We gｅt wiseｒaｓwe get ｏld．随着年岁的增长,我们也变得聪明些了。
４. 用bｅfoｒe引导:beｆorｅ表示“在……之前”。
如:Tuｒn off the liｇｈts before ｙou go ｔo bed. 睡觉前要关灯。
Bｅｆｏre he went toｕnｉversity he ｗas a wｏrｋeｒ．上大学之前他是工人。
5. 用after引导：afｔｅr表示“在……之后”。
如：I wilｌｔell you aｆｔer they leａve. 他们走我再告诉你。
After ｙｏｕｆiｎish ｔｈe letｔeｒｓhow it to me．信写完后给我看看。
18-19 Module 4 Section Ⅲ Grammar——时间状语从句和省略
应
③The first time that rap artists recorded their music，musicians
recorded the backing tracks (the music without the singing) in the 语 studio and the rappers added their vocals later.
点
作到从句动作发生时开始
拨
返 首 页
语
境
自
主
领 悟
He waited until she had finished speaking.
语
法;t go home until you finish your work.
语
落 实
法 精
工作完成后你才能回家。
要
点
拨
返 首 页
实
精
要
③You will grow wiser as you grow older.
点
拨
返 首 页
语
境 自
2．until，till 的用法
主 领
主句形式 主句谓语
意义
悟
语
意为“直到……为止”，表示主句中的动作 肯定句 用延续性动词
法 应 用
到从句动作发生时结束
落
语
实
法 精 要
意为“直到……才……”，表示主句中的动 否定句 用短暂性动词
式，表示“一……就……”，且 no
用 落
sooner/hardly 位于句首时，主句要用倒装语序。 实
法 精
④No sooner had he reached home than it began to rain.
状语从句的省略
状语从句的省略一、五种状语从句常简化:① if, unless条件状语从句;② when, while, as, before, after, until / till时间状语从句;③ although, though, even if / though让步状语从句;④ as, as if方式状语从句;⑤ as, than比较状语从句。
二、状语从句省略的两个条件:①主句和从句的主语一致，或从句主语为it；②从句谓语动词含有be的某种形式。
e.g.条件：He’ll go to the seaside fo r his holiday if (it is) possible.时间：When (the museum is) completed, the museum will be open to the public next year.比较：I’m taller than he (is tall ).The higher the temperature (is), the greater the pressure (is ).三、状语从句省略后的形式1）从句主语为it的从句：条件：If (it is) possible, he will help you out of the difficulty.让步：You must attend the meeting unless (it is) inconvenient to you. 2）主句和从句的主语一致a.连词+形容词As (he was) young, he learned how to ride a bike.Whenever (she is) free, she often goes shopping.Work hard when (you are) young, or you'll regret.b.连词+名词While (he was) a young boy, he was always ready to help others. Although (he was) a farmer, now he is a famous director.c.连词+现在分词As (she was) walking along the river bank, she was singing a pop song. Although (he is) doing his best in maths these days, he has still got no good marks.d.连词+过去分词He won't go there with us unless (he is) invited.The concert was a great success than (it was) expected.e.连词+不定式He stood up as if (he were) to say something.He wouldn't solve the problem even if (he were) to take charge.f. 连词+介词短语She looked anxious as though (she was) in trouble.He had mastered the English language before (he was) in the USA.注意:当从句主语和主句主语不一致时,从句部分要么用完整的句子,要么用独立主格结构来表达。
知识点——状语从句的省略现象
状语从句的省略现象
状语从句的省略现象
【知识点解析】
另外，当once作"一旦，一经"解，连接时间或条件状语从句， 其主语与主句的主语相同或其主语为it + be时，常省略从句中的 主语或it + be。例如：
Once (it was) published, his work became famous for the absence of rhyme at the end of each line.
【知识点解析】
但若if引导的是表示假设的虚拟条件句，虽具备条件， 可不能用于这类省略。这时如果if从句的谓语动词中含有were， had，should，则可以用倒装省略，即将were，had或should提 到句首，而将连词if省略。 例如：
Were it not for you, I would also go there with them. Had you come here earlier, you would have met him. Should it be fine tomorrow, we would go for an outing.
知识点—— 状语从句的省略现象
状语从句的省略现象
【知识点解析】
我们在使用时间、地点、条件、让步、原因、 比较或方式等之类的状语从句时，如果其中谓语部 分含有to be的任何一种形式，而主语又与主句的主 语相一致或主语为it时，为避免重复，使语言生动、 自然、简洁，常可以省略从句德主语和谓语的部分， 特别是动词be。这种现象称为状语从句的省略。下 面做简要例析。
比较状语从句省略
状语从句的省略上传: 杜晓萍更新时间：2012-6-2 10:09:43【三】状语从句的省略一般说来省略现象多出现在下列五种状语从句中：由 when ,while ,as ,before, after , till, until, once等引导的时间状语从句；由whether ,if , unless 等引导的条件状语从句；由 though , although ,even if ,whatever等引导的让步状语从句；由 as ,than 等引导的比较状语从句；由as, as if , as though 等引导的方式状语从句。
上述状语从句在省略时，并非任何成分都可以省略而是遵循下面原则：（1）当状语从句的主语与主句的主语一致时且从句中含有be动词的某种形式时，可以省略状语从句的主语和系动词be ，这时从句中可出现如下结构：①连词（as, as if , once）+ 名词如：once (he was)a worker ,pang long now becomes a famous singer .庞龙曾经是个工人，现在变成一位著名的歌手。
②连词（ though, whether , when）+形容词如：work hard when (you are) young ,or you'll regret.趁年轻要努力学习，要不然你会后悔的。
③连词(whether, as if ,while )+介词短语如：he looked everywhere as if (he was)in search of something .他到处看似乎在找什么东西。
④连词(when , while , though )+ 现在分词如：while (he was) holding talks with president hu jintao , us president george w. bush thanked china for its important r ole in the six-party talks.美国总统布什在与胡锦涛主席会谈时，感谢中国在六方会谈中起的重要作用。
高中英语状语从句省略现象单选题40题(含答案)
高中英语状语从句省略现象单选题40题(含答案)1. When _____, the museum is very beautiful.A. lightingB. litC. is litD. being lit答案：B。
本题考查时间状语从句的省略。
完整的句子是When it is lit，这里省略了it is，lit 在这里是过去分词表被动。
A 选项lighting 是现在分词，主语应该是人，而不是博物馆；C 选项多了is；D 选项being lit 多了being，显得多余。
2. While _____ in the library, he found a rare book.A. readingB. readC. is readingD. being read答案：A。
When/While + 现在分词短语表示时间状语从句的省略，完整的句子是While he was reading in the library。
B 选项read 是过去式或过去分词，形式错误；C 选项多了is；D 选项being read 是被动形式，不符合语境。
3. After _____ his homework, he went out to play.A. finishB. finishingC. finishedD. being finished答案：B。
After + 现在分词短语表示时间状语从句的省略，完整的句子是After he finished his homework。
A 选项finish 是动词原形，形式错误；C 选项finished 单独使用不能表省略；D 选项being finished 是被动形式，不符合语境。
4. Before _____ to bed, she read a story.A. goB. goingC. wentD. being gone答案：B。
Before + 现在分词短语表示时间状语从句的省略，完整的句子是Before she went to bed。
while引导的时间状语从句例句
while引导的时间状语从句的用法和例句一、while引导的时间状语从句的时态while引导的时间状语从句通常表示主句的动作和从句的动作同时发生，因此从句的谓语动词一般是延续性的，即可以持续一段时间的动词。
根据主句的时态，从句的时态有以下几种情况：如果主句是一般过去时，从句用过去进行时，表示过去某个时刻或某段时间内同时进行的两个动作。
例如：He fell asleep while he was watching TV. 他看电视的时候睡着了。
She learned a lot while she was working in the library. 她在图书馆工作的时候学到了很多。
如果主句是一般现在时，从句用现在进行时，表示现在某个时刻或某段时间内同时进行的两个动作。
例如：He listens to music while he is doing his homework. 他做作业的时候听音乐。
She often talks on the phone while she is driving. 她开车的时候经常打电话。
如果主句是一般将来时，从句用将来进行时，表示将来某个时刻或某段时间内同时进行的两个动作。
例如：He will call you while he is traveling. 他旅行的时候会给你打电话。
She will study hard while she is preparing for the exam. 她准备考试的时候会努力学习。
如果主句是过去完成时，从句用过去完成进行时，表示过去某个时间点之前一直同时进行的两个动作。
例如：He had already finished his report when I arrived, while he had been working on it for two hours. 我到达的时候，他已经完成了他的报告，而他已经在做了两个小时了。
状语从句省略的十大类型
状语从句省略的十大类型请看2004年的一道高考试题It shames me to say it, but I told a lie when _____ at the meeting by my boss.A. questioningB. having questionedC. questionedD. to be questioned 在行文结构上，从属连词as, though, when, while, unless, once 等引导的状语从句常常出现省略。
这些从句中的省略往往不尽相同，很难找到一个统一的规律，同学们应着重注意以下十种情况。
一、as引导的从句的省略【现象】①省略：主语和谓语；主语和动词be。
②保留：状语、分词。
例She plays with it as a cat with a mouse. 她玩得就象猫玩老鼠一样。
【经典试题】There are now three times as many schools in this city _____ ten years ago. A. as it is B. with C. more than D. as二、as if引导的方式状语从句的省略【现象】①省略：主语和系动词；主语和谓语。
②保留：表语、分词或者状语。
例She opened her mouth as if to say something. 她张开嘴好象想说什么。
【经典试题】The man we followed suddenly stopped and looked as if _____ whether he was going in the right direction.A. to seeB. seeingC. seenD. saw三、though/although引导的让步从句的省略【现象】①省略：主语和动词be。
②保留:表语或者分词。
例The hours we were together were long, though seeming short. 我们在一起的时间很长，尽管看上去很短。
教师版时间状语从句
时间状语从句考点：1.1.时间状语：at ,in ,on时间状语从句：当时间状语不是一个介词短语而是一个句子的时候。
时间状语的引导词：一.when, while, asa.When+延续性动词、非延续性动词，时间上既可同时发生也可发生在之前。
b.如果主句和从句都是系表结构，且主语一致，可以用as省略结构。
2.while必须是延续性动词。
3.as表示两个动作交替进行或者同时完成，翻译为：随着，一边。
一边二..as soon as, immediately, directly, instantly, the moment/minute/instant(不能用介词在前）no sooner......than hardly/scarcely.....when(注意：主句要倒装并且用过去完成时，从句用一般过去时）三.till, until, not untilA.肯定句，主句谓语必须是延续性。
B.否定句，主句谓语必须是非延续性。
C.not until.......that 位于句首主句倒装D.It is not until......that 强调句型。
四.before, after, since,before 从句不用否定式。
a.It will be +一段时间before.......还要多久才能b.It is +一段时间since........五.every time,each time, next time,the first time, any time练习题( )1. It was quiet ________ those big trucks started coming through the town.A. beforeB. AfterC. UntilD. unless( )2. It seemed only seconds ________ the boy finished washing his face.A. whenB. beforeC. AfterD. even if( )3. Hardly had he reached the school gate ________ the bell rang.A. whileB. whenC. asD. as soon as( )4.We were told that we should follow the main road _____ we reached the centralrailway station.A. wheneverB. untilC. whileD. wherever( )5. I recognized you ________ I saw you at the airport.A. the momentB. whileC. afterD. once( )6. He was about to go to bed ________ the doorbell rang.A. whileB. asC. beforeD. when( )7.________I listen to your advice, I get into trouble.A. Every timeB. WhenC. WhileD. Until( )8. _____ John was watching TV, his wife was cooking.A. AsB. As soon asC. WhileD. Till( )9. The children ran away from the orchard(果园) ______ they saw the guard.A. the momentB. afterC. beforeD. as( )10. No sooner had I arrived home _____ it began to rain.A. whenB. whileC. asD. than( )11. Several weeks had gone by _____ I realized the painting was missing.A. asB. beforeC. sinceD. when( )12. It _____ long before we ____ the result of the experiment.A. will not be; will knowB. is; will knowC. will not be ; knowD. is; know( )13. –What was the party like?--Wonderful. It’s years _____ I enjoyed m yself so much.A. afterB. beforeC. whenD. since( )14. The new secretary is supposed to report to the manager as soon as she_____.A. will arriveB. arrivesC. is going to arriveD. is arriving( )15. _____ got into the room _____ the telephone rang.A.He hardly had; thenB. Hardly had he; whenC. He had not; thenD. Not had he; when( )16. No sooner had he finished his talk _____ he was surrounded by the workers.A. asB. thenC. thanD. when( )17. –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. once( )18. I thought her nice and honest _____ I met her.A. first timeB. for the first timeC. the first timeD. by the first time( )19. He will have learned English for eight years by the time he _____ fromthe university next year.A. will graduateB. will have graduatedC. graduatesD. is to graduate( )20. 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。
时间状语从句用法（最新版-修订）
As we were going out, it began to snow.当我们出门时，开始下雪了。
（as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间）2.由before和after引导的时间状语从句。
注意before引导的从句不再用否定式的谓语，并且当before引导的从句位于主句之后，有时译成“就，才”。
还要注意主句和从句之间的时间关系。
当主句用将来时，从句总是用现在时；如果before引导的主句谓语用的是过去完成时，则从句动词多用一般过去时，这样以便体现动作发生的先后。
After表示主句动作发生在从句动作之后。
主句和从句的动作的时间关系正好与before引导的从句相反。
例如：It will be four days before they come back. 他们要过四天才能回来。
Einstein almost knocked me down before he saw me.爱因斯坦几乎把我撞倒才看到我。
My father had left for Canada just before the letter arrived.我父亲恰好在信到之前去加拿大了。
They had not been married four months before they were divorced.他们结婚还不到四个月就离婚了。
After you think it over, please let me know what you decide.你仔细考虑过以后，告诉我你是怎样决定的。
After we had finished the work, we went home.完成工作之后，我们回家了。
（从句用过去完成时，主句用一般过去时）3.由till或until引导的时间状语从句。
till和until一般情况下两者可以互换，但是在强调句型中多用until。
并且要注意的是：如果主句中的谓语动词是瞬时动词时，必须用否定形式；如果主句中的谓语动词是延续性动词时，用肯定或否定形式都可以，但表达的意思不同。
高中英语状语从句省略现象单选题40题
高中英语状语从句省略现象单选题40题1.When ______ in the library, we should be quiet.A.readB.readingC.to readD.having read答案：B。
本题考查时间状语从句的省略。
当主句和从句的主语一致，且从句谓语动词含有be 动词时，可以省略从句的主语和be 动词。
这里完整的句子是When we are reading in the library，省略we are 后变为when reading in the library。
A 选项read 形式错误；C 选项to read 表目的，不符合语境；D 选项having read 表示完成，也不符合语境。
2.______ the bell rang, the students rushed out of the classroom.A.As soon asB.WhileC.SinceD.Until答案：A。
as soon as 引导时间状语从句，表示“一……就……”。
while 表示“当……的时候”，通常强调动作的同时性；since 表示“自从”；until 表示“直到……才”。
这里“铃一响，学生们就冲出教室”，A 选项符合语境。
3.I was doing my homework ______ my mother came back.A.whenB.whileC.asD.since答案：A。
when 既可以表示某个具体的时刻，也可以表示一段时间。
while 强调动作的同时性；as 强调伴随；since 表示“自从”。
这里表示“我正在做作业的时候妈妈回来了”，用when。
4.______ time goes by, we become more mature.A.AsB.WithC.SinceD.Because答案：A。
as 引导时间状语从句，表示“随着”。
with 后面不能接句子；since 表示“自从”；because 表示原因。
状语从句引导词省略
状语从句引导词状语从句的简化♠状语从句的省略状语从句同时具备下列两个条件:①主句和从句的主语一致，或从句主语为it；②从句主要动词是be的某种形式。
从句中的主语和be动词常可省略。
例如：When ( the lab is ) completed ,the lab will be open to the public .He’ll go to the seaside for his holiday if (it is ) possible.另外，比较状语从句经常省略。
例如：I’m taller than he (is tall ).The higher the temperature (is), the greater the pressure (is ).状语从句的"简化"现象常存在于以下五种状语从句中:①由if, unless等引导的条件状语从句;②由although, though, even if / though等引导的让步状语从句;③由when, while, as, before, after, until / till等引导的时间状语从句;④由as, as if等引导的方式状语从句;⑤由as,than等引导的比较状语从句。
(1)当状语从句的主语是it,且谓语动词是be时,it和be要完全简化掉。
例如:If (it is) possible, he will help you out of the difficulty.You must attend the meeting unless (it is) inconvenient to you.(2)当状语从句的主语和主句的主语一致时,从句可以将主语和be动词简化掉。
a.连词+形容词As (he was) young, he learned how to ride a bike.Whenever (she is) free, she often goes shopping.Work hard when (you are) young, or you'll regret.少壮不努力,老大徒伤悲。
高三英语状语从句省略用法单选题30题
高三英语状语从句省略用法单选题30题1.When _ at the airport, she found her passport missing.A.arrivedB.arrivingC.having arrivedD.arrive答案：B。
本题考查时间状语从句的省略用法。
当主句和从句的主语一致，且从句中含有be 动词时，可以省略从句中的主语和be 动词。
此句中，she 和arrive 是主动关系，所以用arriving。
A 项arrived 表示被动或过去完成，不符合；C 项having arrived 强调先后顺序，此处不需要；D 项arrive 形式错误。
2._ the bell rang, the students rushed out of the classroom.A.ImmediatelyB.No sooner hadC.As soon asD.Hardly when答案：C。
A 项immediately 可作连词引导时间状语从句，当从句主语和主句主语一致时，可以省略主语和be 动词，但此处未体现省略用法，且意思不如as soon as 直接；B 项no sooner had 需倒装，与题干不符；D 项hardly when 也需倒装，不符合要求。
as soon as 引导时间状语从句，符合语法规则。
3._ she heard the news, she burst into tears.A.The momentB.At the momentC.For the momentD.In a moment答案：A。
the moment 可以引导时间状语从句，相当于as soon as。
B 项at the moment 表示“此刻”，不是连词；C 项for the moment 表示“暂时”，不是连词；D 项in a moment 表示“一会儿”，不是连词。
4._ he came in, I was reading a book.A.WhileB.WhenC.AsD.All of the above答案：D。
状语从句用法分析
状语从句用法分析在公众号里输入关键字"yycj"或"英语从句"可跳转到该文章.一、时间状语从句1、时间状语从句常用的连词when，whenever，as，before，after，until，till，by the time，as soon as，hardly … when，no sooner … than，the moment，immediately，directly，instantly，例如：when:I will arrive when dinner is ready.晚饭好了我就来。
whenever:He said he’ll go whenever you decide it’s time to leave.他说只要你决定离开他就去。
while:Animals are cute while they’re young.动物小时候很可爱。
before:Before you leave, let me give you a kiss.在你离开之前，让我吻你一下。
after:Teachers grade papers after the students go home for the day.学生回家后老师批改试卷一天。
since:I have loved you since the day I met you.自从遇见你那天起，我就爱你了。
until:She waited on the shore until the ship departed.她在岸上等着，直到船离开。
once:The bully stopped picking fights once he realized it was wrong.当恶霸意识到这是错误的时候，他就不再挑起争斗了。
2、比较 while、when 和 as3、有一些表示时间的名词短语也可用来引导时间状语从句the minute，the moment，every time，the first time，例如：the minute:The minute you do this, you'll lose control.你一旦做了这件事，就会失去控制。
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时间状语从句和省略
一、时间状语从句
1. 某些易用错的连词。
(1) 连词immediately / directly / instantly和词组the moment, the minute意为“一……就……”，相当于as soon as。
如：
The thief ran away the moment / directly he saw the policeman.
[注意]
a. immediately / directly / instantly也是副词，在句中作状语。
如：
I didn’t immediately realize how serious the situation was.
b. 介词on / upon +名词/ V-ing也表示“一……就……”。
如：
Yao Ming was surrounded by the media on his arrival at the airport.
On seeing the painting by Van Gogh, I fell in love with it at once.
(2) 词组the first time, the last time, each time, every time以及by the time，都引导时间状语从句。
如：
The first time I spoke English before foreigners, I was a student of high school.
Every time I meet the policeman at that crossroads, he will give me a big smile.
[注意] for the first time是介词短语，意为“第一次……”，常用来作状语。
They had a face-to-face talk for the first time.
(3) when, while和as引导时间状语从句的区别：
when引导时间状语从句时，可与短暂性动词连用，也可与延续性动词连用；而
while只能与延续性动词连用；as表示两个动作的同时性，意为“一边……，一边……”。
如：
When I entered the classroom, all the students looked up at me curiously.
Could you look after Robert while I am preparing the report?
The children sang as they climbed the mountain.
2. 时间状语从句中的时态。
(1) when, as soon as, every time, immediately, the moment等在引导时间状语从句时，若从句用一般现在时，主句用一般将来时。
如：
The moment I finish my homework, I will go out to play football.
(2) 在It / This / That is the first / second / last time that…中，that从句中的谓语动词用现在完成时；而It / This / That was the first / second / last time that…中，that从句中的谓语动词用过去完成时。
如：
This is the first time that I have visited the Great Wall.
That was the second time that he had been interrupted by the noise outside.
二、省略
1. 状语从句中的省略。
(1) 连词when, while, if, as, though / although, until, once, whether, unless, where等引导的状语从句中，当主句的主语和从句的主语一致时，常省略跟主句相同的主语和be，只剩下主要的部分。
如：
While / When (you are) crossing the street, you must be careful.
Unless (I am) invited to attend the party, I won’t go to his house.
(2) 当出现when, if, where, wherever, whenever, than等后直接接possible, necessary时，可理解为省略了“it + be的适当形式”。
类似的还有：if so, if not, if some, if any, if ever等。
如：
Please call me up if (it is) necessary. I relax with a good book whenever (it is) possible.
2. 不定式结构中的省略。
在同一个句子或紧密联系的对话中，为了避免重复，作宾语或补足语的不定式再次出现时，不定式符号后面的内容常被省略，只保留不定式符号。
常用于refuse, would like / love, wish, want, mean, expect, hope, intend以及afraid, happy, glad, willing, ready等后。
如：
Susan’s parents didn’t allow her to travel alone in Tibet, but she still hoped to (travel alone in Tibet).
[注意] 当to后是be或have 时，be与have 不能省略。
如：
—Is Miss Yang a doctor?
—No, but she used to be (a doctor).
—I haven’t handed in my homework yet.
—Well, you ought to have (handed in your homework).
3. 可以用so, not来替代上文或问句中的一部分或整个句子。
think, believe, guess,
suppose, hope等有这样的用法。
如：
—Can you finish the task ahead of time?
—I think so. / I think not. / I don’t think so.
4. 当不定式作表语时，若主句中出现do的各种形式，to可以省略。
如：
What we should do about the problem is (to) leave it alone.
[注意] 在have no choice but to do…句型中，to不省略，但若有do的各种形式，to可以省略。
如：
They had no choice but to wait for the police to come.
The child does nothing but play all day.
【巩固练习】
1. ______ Lang Lang was in his twenties, he had been a well-known pianist at home and abroad.
A. As soon as
B. Each time
C. For the first time
D. By the time
2. How long do you think it will be ______ the computer company can develop the household robot?
A. since
B. before
C. unless
D. that
3. — Have you got any plans for the coming Christmas holiday?
—Yes. ______, I’m going to visit China.
A. If not
B. If necessary
C. If possible
D. If so。