as since when 怎么用？
这个国人不好把握的，说真的。
以我之见，as 和since 的程度没有when 和while深，也就是说他们所表达原因或者时间状语总是风轻云淡的感觉。国人能很好的把握when 和while但是前两者比较难的。
从意思来讲，when 比较好理解，就是当。。。 时候，而while是两者同时进行的，强调同时性，有几分转折的异味。since 可以理解为从。。。时候，，as则是就在。。。时候
这是我的理解，当然有许多不足之处，希望对你有所帮助。
祝学习进步，work hard, play hard.
when，while，as显然都可以引导时间状语从句，但用法区别非常大。 一、when和as可以和延续性动词连用，也可以和短暂性动词连用；而while只能和延续性动词连用。 ① Why do you want a new job when you’ve got such a good one already？（get为短暂性动词）你已经找到如此好的工作，为何还想再找新的？ ② Sorry，I was out when you called me．（call为短暂性动词）对不起，你打电话时我刚好外出了。 ③ Strike while the iron is hot．（is为延续性动词，表示一种持续的状态）趁热打铁。 ④ The students took notes as they listened．（listen为延续性动词）学生们边听课边做笔记。 二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while和as从句的谓语动作必须是和主句谓语动作同时发生。 1．从句动作在主句动作前发生，只用 when。 ①When he had finished his homework，he took a short rest．（finished先发生）当他完成作业后，他休息了一会儿。 ②When I got to the airport，the guests had left．（got to后发生）当我赶到飞机场时，客人们已经离开了。 2．从句动作和主句动作同时发生，且从句动作为延续性动词时，when，while，as都可使用。 ①When ／While ／As we were dancing，a stranger came in．（dance为延续性动词）当我们跳舞时，一位陌生人走了进来。 ②When ／While ／As she was making a phonecall，I was writing a letter．（make为延续性动词）当她在打电话时，我正在写信。 3．当主句、从句动作同时进行，从句动作的时间概念淡化，而主要表示主句动作发生的背景或条件时，只能用 as。这时，as常表示“随着……”；“一边……，一边……”之意。 ① As the time went on，the weather got worse．（as表示“随着……”之意） ② The atmosphere gets thinner and thinner as the height increases．随着高度的增加，大气越来越稀薄。 ④ As years go by，China is getting stronger and richer．随着时间一年一年过去，中国变得越来越富强了。 ⑤ The little girls sang as they went．小姑娘们一边走，一边唱。 ⑥ The sad mother sat on the roadside，shouting as she was crying．伤心的妈妈坐在路边，边哭边叫。 4．在将来时从句中，常用when，且从句须用一般时代替将来时。 ①You shall borrow the book when I have finished reading it．在我读完这本书后，你可以借阅。 ②When the manager comes here for a visit next week，I’ll talk with him about this．下周，经理来这参观时，我会和他谈谈此事。 三、when用于表示“一……就……”的句型中（指过去的事情）。 sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．． ①I had hardly ／scarcely closed my eyes when someone knocked at the door．＝Hardly ／ Scarcely had I closed my eyes when someone knocked at the door． 我刚一闭上眼，就有人在敲门了。 ②I had hardly ／scarcely entered my room when the telephone rang．＝Hardly ／Scarcely had I entered my room when the telephone rang． 我刚一走进房门，电话就响了。 四．其它情况 1> When 还可以作并列连词 “这时”的意思。 常用于 be about to do when, be doing when , be on the point of doing when, 以及 had hardly/scarcely done… when…结构中。 Eg: I was about to go out when the teacher came in . 我正想出去，这时候老师进来了。 He had hardly sat down when his mobile rang. 2> While 引起让步状语从句，意思是“虽然…但是….”、“尽管…但是…”(多放于句首) While he loves his students，he is very strict with them.. 虽然他爱他的学生，可是他对他们很严格。 3> While 还能作并列连词 “而，然而” 表示对比。 Some people waste food while others haven't enough. 有些人很费粮食，然而有些人却吃不饱。 The son was having a good meal at home，while the parents were working in the fields. 儿子在家吃好饭而父母却在田里辛勤劳作。 五．练习： 1 He will write to you as soon as he ____ to Shanghai. A. gets B. is getting C. will get D. shall get 2 He was about to tell me the secret _____ someone patted him on the shoulder. A. as B. while C. when D. until 3 ____ mother got home, I was tidying my room. A. While B. When C. As soon as D. Before 4 The teacher didn’t begin her class ______ the students stopped talking. A .until B. because C. after D. when . 5 ---Why didn’t you help the little boy? ---He had struggled to his feet_____ I reached him. A. after B. till C. before D. when 6 You must make your new house clean and safe_____ you move in . A. because B. when C. before D. until 7 I was so familiar with her that I recognized her voice _____ I pick up the phone. A. after B. the moment C. while D. before. 8 Mr. Wang likes popular songs______ his wife likes classical music. A. when B. while C. if D. so 9 ___ life pace continues to speed up, we are quickly losing the art of enjoyment. A. With B. When C. As D. While 10 The door of the lift was closed _____ I could enter in. (还没来得及…就…) A. as B. since C. until D. before. 11 ____ he grew older he became interested in gardening. A. As B. That C. During D. If 12 ---How long has your family lived here ? --- _________1932. A. After B. In C. From D. Since 13 I enjoy visiting friends ______ my sister would rather stay at home. A .when B. while C. after D. as. 14 By the end of last year, we _______ 700 English words. A .have learned B. learned C. would learn D. had learned. 15 ___ you have made a promise , you should carry it out . A. Until B. Once C. For D. As soon as while和as引导的时间状语从句，什么时候只能用其中一个，不能用两一个代替？ as， while和when均可用作从属连词，引导时间状语从句，作“当……时候”解。它们所引导的时间状语从句有时意思一样，有时却有差异。意思相同时，这三个词可以互换使用；意思不同时，则不能互换。 一、 as的意思是“正当……时候（just as，at the same moment that）”“随着……(while，when)”,它既可表示一个具体的时间点，也可以表示一段时间。as可表示主句和从句的动作同时发生或同时持续，即“点点重合”“线线重合”；又可表示一个动作发生在另一个动作的持续过程中，即“点线重合”，但不能表示两个动作一前一后发生。如果主句和从句的谓语动词都表示持续性的动作，二者均可用进行时，也可以一个用进行时，一个用一般时或者都用一般时。例如： 1. As I got on the bus， he got off. 我上车，他下车。（点点重合） 2. He was writing as I was reading. 我看书时，他在写字。（线线重合） 3. The students were talking as the teacher came in. 老师进来时，学生们正在讲话。（点线重合） 二、while的意思是“在……同时（at the same time that )”“在……期间(for as long as, during the time that）”。从while的本身词义来看，它只能表示一段时间，不能表示具体的时间点。在时间上可以是“线线重合”或“点线重合”，但不能表示“点点重合”。例如： 1. He was watching TV while she was cooking. 她做饭时，他在看电视。（线线重合） 2. He was waiting for me while I was working. 我工作的时候，他正等着我。（线线重合） 3. He asked me a question while I was speaking. 我在讲话时，他问了我一个问题。（点线重合） 三、 when的意思是“当……时候（at the time that）”“无论什么时候（whenever）” “一……就……（as soon as ）” “在……以后（after）”。它表示的时间概念比较广泛，上述例句中的as或while均可用when代替，因为when不但可以表示具体的时间点，而且也可以表示一段时间。在时间上它既能表示“点点重合”“线线重合”，又能表示“点线重合”。例如： 1.When he came in， she went out. 他进来，她出去。（点点重合） 此句中when从句的动作表示的是一个时间点，when可以用as代替，但不能用while代替。 2. When he came back， I was doing some washing. 他回来时，我在洗衣服。（点线重合） 此句中when从句的动作表示的是一个时间点，所以只能用as代替，不能用while代替。 3. When Mary was writing a letter, the children were playing outside. 玛丽写信时，孩子们都在外面玩。（线线重合） 此句中的when从句的动作表示的是一段时间，故可用as 或 while代替。 since KK: [] DJ: [] ad.(常用于现在完成时或过去完成时) 1. 此后;从那时到现在 She left school three years ago and has worked as a nurse ever since. 她三年前毕业,从那时起便一直当护士。 2. 之前,以前 prep. 1. (常用于现在完成时或过去完成时)自...以来,从...至今 I haven't heard from him since last year. 我自去年以来未曾收到过他的信。 conj. 1. (常用于现在完成时或过去完成时)自...以来,从...至今 It's been ten years since they married. 他们结婚到现在已经十年了。 She has been living a hard life since her husband died. 她自从丈夫死后,一直过着艰苦的生活。 2. 既然;因为,由于 He must have taken the book since it isn't here. 他一定是把书拿走了,因为书已不在这里了。 Since it is so hot, let's go swimming. 既然天气这么热,我们去游泳吧
as副词 adv.
1.同样地, 一样地
She is as tall as her mother.
她和她母亲一样高。
The dining room was twice as big as the Tom's.
这个餐厅比汤姆的餐厅大一倍。
This is as difficult a problem as you are likely to meet.
像这样的难题, 你可能会碰到。
介词 prep.
1.(表示时间)当还是…的时候
As a schoolboy, he showed every sign of genius.
当他还是个小学生的时候, 就显示出了天资聪慧。
2.(表示方式)以…的身份, 以…资格, 作为; 以…形式, 以作为; 以…角色, 扮演…角色; 如同, 像
3.(表示结果)成为, 看作, 看成
We had better treat it as a joke.
我们最好把它当作玩笑。
4.(表示目的)为了, 以…为目的
The dykes were built as a protection against the sea.
建筑堤坝是为了防止海水泛滥。
5.(表示举例)例如, 诸如…之类的
We talked about such subjects as the weather.
我们谈论了诸如天气之类的话题。
连接词 conj.
1.在…期间, 当…时候
I was coming in as he was going out.
我进来的时候, 他正出去。
2.尽管, 即使, 虽然
Intelligent as you are, I suspect you will fail.
尽管你聪明, 我猜想你会失败。
3.像…一样
4.由于, 因为
As you weren't there I left a message.
因为你不在那里, 我留了个信儿。
5.照…方式
6.正如；如同
since
KK: []
DJ: []
ad.(常用于现在完成时或过去完成时)
1. 此后;从那时到现在
She left school three years ago and has worked as a nurse ever since.
她三年前毕业,从那时起便一直当护士。
2. 之前,以前
prep.
1. (常用于现在完成时或过去完成时)自...以来,从...至今
I haven't heard from him since last year.
我自去年以来未曾收到过他的信。
conj.
1. (常用于现在完成时或过去完成时)自...以来,从...至今
It's been ten years since they married.
他们结婚到现在已经十年了。
She has been living a hard life since her husband died.
她自从丈夫死后,一直过着艰苦的生活。
2. 既然;因为,由于
He must have taken the book since it isn't here.
他一定是把书拿走了,因为书已不在这里了。
Since it is so hot, let's go swimming.
既然天气这么热,我们去游泳吧
when
ad.
1. (用作疑问副词)什么时候,何时
I'd like to know when they'll let him out.
我想知道他们什么时候放他。
When did you last see Margaret?
你上一次见到玛格丽特是什么时候?
2. (用作关系副词,引导关系从句)当...时
There were times when I didn't know what to do.
有些时候我不知道该怎么办才好。
conj.
1. 当...时
John got engaged to her when travelling last winter.
去年冬天旅行时,约翰与她订了婚。
Don't get excited when you talk.
你说话时别激动。
2. 既然,考虑到
How can he get the promotion when his boss dislikes him?
既然上司不喜欢他,那他怎么会获得提升呢?
3. 虽然,然而
I had only fifteen dollars on me when the book I wanted cost twenty.
我身上只带了十五元钱,可是我想买的那本书定价二十元。
4. 在那时,然后
pron.
1. 什么时候,那时
Since when has she taught here?
她从什么时候开始在这儿教书的?
n.
1. (事件发生的)时间[the S]
龙谦昆明： as副词 adv.1.同样地, 一样地 She is as tall as her mother.她和她母亲一样高.The dining room was twice as big as the Tom's.这个餐厅比汤姆的餐厅大一倍.This is as difficult a problem as you are likely to meet.像这样的难题, 你可能会碰到....
鸠江区14712045481： before/after/until/when/as/since的区别与用法 - ？
龙谦昆明： until:直到….相关词组:not…until解释:直到…才结束! as接条件状语:常解释:正如.(表示原因,条件的) since解释:从…开始.他跟的是时间点.如1999,十六世纪三十年代. While:解释:正当做….有时候也做介词:而且. before:在…之前. when:当…时候.
鸠江区14712045481： 讲一下whlie ,when ,as ,since引导的句子有什么特征,怎么用? - ？
龙谦昆明： 在定语从句中where when 的用法: (1)when 可以代替in/on which 引导时间定语从句.例如 That was the year when he was born. 那是他出生的那一年. Sunday is a day when people don't have to go to work.星期天是人们不用上班的一天....
鸠江区14712045481： 全面介绍一下,as,since,when,while的用法,特别是 - ？
龙谦昆明： 这个国人不好把握的,说真的. 以我之见,as 和since 的程度没有when 和while深,也就是说他们所表达原因或者时间状语总是风轻云淡的感觉.国人能很好的把握when 和while但是前两者比较难的. 从意思来讲,when 比较好理解,就是当... 时候,而while是两者同时进行的,强调同时性,有几分转折的异味.since 可以理解为从...时候,,as则是就在...时候这是我的理解,当然有许多不足之处,希望对你有所帮助. 祝学习进步,work hard, play hard.
鸠江区14712045481： 几个连词的用法:until as since while before when (讲得稍详细,容易理解一点) - ？
龙谦昆明：[答案] until:直到….相关词组:not…until解释:直到…才结束! as接条件状语:正如.(表示原因,条件的) since解释:从…开始.他跟的是时间点.如1999,十六世纪三十年代. While:正当做….有时候也做介词:而且. before:在…之前. when:当…时候.
鸠江区14712045481： before/after/until/when/as/since的区别与用法 - ？
龙谦昆明： 从此以上区别就可以了1在·····之前2在····之后3直到4当···时候5像····一样6从····
鸠江区14712045481： 连词中引导时间状语从句的as的用法 - ？
龙谦昆明： when, while, as都可作＂当……的时候＂解,但它们之间也有差别. 1. 若主句表示的是一个短暂性动作,从句表示的是一个持续性动作,三者都可用. He fell asleep when/while/as he was reading. 他看书时睡着了. 2. when只表示一般的时间关...
鸠江区14712045481： since和when的用法 - ？
龙谦昆明： since,因为since这个英语单词常用于现在完成时或过去完成时(题目中有has been所以属于现在完成时).since的意思是自···以来,从···至今.这句话的整体意思就为 :这个男人自从他是个小男孩以来就在弹吉他.用when显然意思上就不合适.你应该从意思上进行比较
鸠江区14712045481： sincewhilewhenas之间的联系和区别? ？
龙谦昆明： As引导时间状语从句,意思是:随着,表示动作同时发生,通常放在句首. when,while和as引导时间状语从句 when引导的时间状语从句既可表示“点时间”,也可表示“...
