when和before句型
when和before句型
Hale Waihona Puke 正在做某事时突然… 1. be doing sth.…when …正在做某事时突然 正在做某事时突然 Eg. He was still smiling when the door opened and his wife came in. 正要做某事时突然… 正要做某事时突然 2. be about to do sth. …when … Eg. We were about to start when it began to rain. 3. had not/hardly/just done sth. when … Eg. He hadn’t/hardly fallen asleep when the telephone rang. 4. had just done …when … Eg. He had gone to bed when the telephone rang.
before句型 句型
4. had not done…before不到 就… 不到…就 不到 Eg. We hadn’t walked a mile before he felt tired. 5. It was not +一段时间 一段时间+before… 一段时间 不多久就… 不多久就 Eg. It wasn’t 2 years before he left the country.
when句型 句型
before句型 句型
1. It will be +时间 时间+before …还有多长时间 还有多长时间… 时间 Eg. It will be 4 years before he graduates. 2. before sb… can/could…某人还没来得及 某人还没来得及… Eg. The phone rang in the middle of the night, and the hung it up before I could answer it. 3. had done some time before…才… 才 Eg. They had sailed three days and three nights before they saw land. .
before与ago、when,while,as区别
一、before与ago的区别1.ago表示“从现在起的若干时间以前”，意思是“距今……以前”，需和过去时或过去进行时连用。
before泛指“从过去起的若干时间以前”，意思是“距过去某时……以前”“与其……（毋宁）”，常和完成时连用，尤其在间接引语中，如：I visited him three days ago, but he had gone to Shanghai a week before．我三天前去访问他，但他已与那时的一周前到上海去了。
His parents died ten years ago．他父母十年前都去世了。
He said that his parents had died ten years before．他说他父母亲十年前都去世了。
I have never been there before．我以前从来没有去过那里。
2.如果不具体表明多少时间以前，只用before不用ago，意为“从前、以前”。
before仍以副词的形式置于被修饰语后，常与完成时候过去时连用。
如：Have you seen this film before?He asked me whether I had been to the Great Wall before．3.表示在某一点时间或事件以前时，只用before不用ago，这种用法是将before当作介词或连词使用。
ago不具有这一功能。
如：They will come back before six o’clock．It is hoped that this will be finished before the year 1995．希望这件工作将在1995年以前完成。
另外，before在句中的含义较多。
不少句子中，before虽然引导的也是一个时间状语，但是译成汉语时却不必译为“在……以前”。
a.如果before引导的从句动作发生得晚或慢，可译成“……才”。
come短语,before,when
come短语,before,whenBefore的翻译连词before是一个常用词，在状语从句中一般译为“在。
之前”，但在很多情况下，由于英汉两种语言的差异，before的翻译极为复杂，不能一律译为“在。
之前”。
例如：It was an awkward moment, for he needed to compose himself before he could greet Charlotte, but he was clearly eager to greet her before he could compose himself.这一刹那是尴尬的，他需要先使自己镇定一下，才能向夏洛蒂问好。
但是他还没来得及镇定下来。
显然就迫不及待地先向她致意了。
Before在这段文字中出现了两次，两处有不同的译法，即“先。
才能。
”和“还没来得及。
就”。
在含表示时间的连词before引导的状语句中，有两个主要动词，表示两件事情一前一后发生，或说甲在乙先，或说乙在甲后，视具体情况用汉语确切而通顺地表达出来，并突出应强调的一方。
因此，before的翻译很灵活，它所对应的汉语极为丰富，不能拘泥于一种译法。
以下是一些最常用的译法。
1. before译为“（在）。
之前”Before the rooster crows, you will say three times that youdon't know me.在公鸡叫之前，你要说三次你不认识我。
You must not count your chickens before they are hatched.小鸡尚未孵出之前不能算数。
2. before译为“来不及。
”、“还没有来得及。
就”Before he could press the trigger, the plane had gone up again.他还来不及扣动板机，飞机又飞高了。
Before we could stop him, he had rushed on to a potato plot and dug up one of the potatoes. 我们还来不及阻止他，他已经飞奔到一块土豆地里，挖出了一只土豆。
时间状语从句用法
概念：在复合句中，由时间连接词引导的状语从句叫做时间状语从句。
(在复合句中，要注意主句和从句的时态大多都要保持一致。
） 1.由when, while, ,just ,just as, as，after, before, since, until, as soon as,引导的时间状语从句。
例如：When you think you know nothing, then you begin to know something.当你以为自己一无所知的时候，你就是在开始知道一些事物了。
When truth is buried under the ground ，it grows, it chokes, it gathers such an explosive force that on the day it bursts out , it blows up everything with it.当真理被埋在地下的时候，它在生长，它感到压抑，它蓄存着这么一种爆炸性力量，一旦冒出，它就会炸破一切！Strike while the iron is hot. 趁热打铁。
You can feel the air moving as your hand pushes through it.当你的手在空气中挥动的时候，你就能感觉到空气在流动。
Our headmaster laughed as she spoke. 我们的校长边谈边笑。
主要时态：主现从不现；主过从四过；主将从现。
when, while和as的区别when引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词；动作既可以和主句的动作同时发生，又可以在主句的动作前后发生。
并且when 有时表示“就在那时”。
例如：When she came in, I stopped eating.她进来时，我停止吃饭。
(瞬时动词)When I lived in the countryside, I used to carry some water for him.当我住在农村时，我常常为他担水。
when-before-since区别及用法
storm started.
AA.. wwhen
B. while C. until
D. before
2. (02上海) He was about to tell me the secret ______ someone
patted him on the shoulder.
A. as
B. until
C. while D. whheenn
when,before,since句型归纳
1、when 句型： (1) be doing sth…when…
He was still smiling when the door opened and his wife came in.
他正笑着的时候门突然开了，他妻子走了进来 。
(2) be about to do sth…when… We were about to start when it began to rain. 我们刚要出发，天就开始下雨了。
It is 5 years since he left Beijing . 他离开北京5年了
It has been 3 years since he came back from abroad.自从他回国已经三年了
3.since句型
It is/has been＋时间段＋since sb. did… §②§did动作为持续动词（延续性），翻译为 自从不做某事有多长时间
(4)hardly /sceracely…when… (一…就…) He had not/hardly/scarcely fallen asleep when the telephone rang. 他刚要入睡电话就响了。
We had scarcely arrived when he asked us to leave. 我们才刚刚到他就叫我们走了.
(完整word版)when,since,before,that句型
It+be+ ⋯⋯ +that/since/before/when 用法辨析1. it was+ ( 时刻，或时间点） + when sth. happened. 当某事发生时，是几点钟或哪一年如：It was 1997 when Hongkong returned to China.It was five o'clock when we arrived at the small mountain village.对比强调句型： It was at five o'clock that we arrived at the small mountain village.It+ is/ was+ ⋯+that ⋯多用于强调。
判断方法如下：去掉 it 、be 和 that ，余下的部分仍是一个完整的句子，这样的句子一定是强调句。
2. it was+ 一段时间 + before sth happened.过了一段时间之后，某事才发生了。
如：it was two years before Macao returned to China.it will be +一段时间before sth. happens.要过一段时间之后，某事才会发生。
或不用过多久，某些就将发生：it won't be long before sth. happens.It won ’t be long before you see him again.没过多久就⋯It was long before they escaped from the prison.过了很久才⋯.3.it is (=has been)+ 一段时间 since sth. happened. 自某事发生以来，（时间）已经过去。
了。
如： It is 11 years since Hongkong returned to China. 香港回归已经有11 年了。
before的用法及句型
before的用法及句型一、`before`的基本用法和意义在英语中，副词`before`是一个常见且重要的词汇。
它可以用作介词或连词，在句子中具有多种用途和含义。
下面将详细介绍‘before'的用法及句型。
**1. 表示时间的“之前”**首先，我们经常使用`before`来表示某个事件发生之前的时间。
例如：- I woke up at 7 a.m., but the sun had risen before that.（我早上7点醒来，但太阳在那之前已经升起了。
）- Please submit your assignment before Friday.（请在周五之前提交你的作业。
）这些句子中的"before"表达了某个特定时间或事件在另一个特定时间或事件之前发生。
**2. 表示顺序或优先级**其次，'before'也可以表示顺序或优先级。
这意味着某物在其他事物之前发生或完成。
例如：- Finish your meal before you go out to play with your friends.（吃完饭后再和朋友出去玩。
）- We need to clean the house before we invite guests over.（我们需要在邀请客人过来前打扫房间。
）这些例子表明完成第二件事情之前必须完成第一件事情。
**3. 表示限制条件**此外，'before'也可以表示限制条件，用于说明某个动作或情况发生的前提。
例如：- You can watch TV before you finish your homework.（在你完成家庭作业之前可以看电视。
）- They won't start the meeting before all the participants have arrived.（所有的参会人员到场之前，他们不会开始开会。
完整版)时间状语从句
完整版)时间状语从句概述：时间状语从句是复合句中由时间连接词引导的表示时间的从句。
在使用时，要注意主句和从句的时态要保持一致。
常用连接词举例：1.when连接的时间状语从句当……时候，如：天气好时，很多家庭都出去散步。
2.before/after连接的时间状语从句在……之前/之后，如：妈妈总是在我放学回家前把晚饭准备好。
3.as soon as连接的时间状语从句一……就……，如：我一完成作业就去电影院。
需要注意的是，时间状语从句一般不用一般将来时态。
若主句为一般将来时态或是含有将来的意味时，时间状语从句常用一般现在时态来代替将来。
例如，当我毕业了，我就要去参军。
As soon as it strikes 12 o'clock。
we all start XXX.Upon our arrival。
XXX.4.时间状语从句中使用until表示一个动作一直持续到某一时刻，例如：He waited until all the people left。
我们也可以说I didn't go to bed until Mum came back。
表示直到妈妈回家后我才上床睡觉。
5.当while连接时间状语时，表示主句的行为在从句行为过程之中发生。
从句中要使用持续性动词或状态动词，并且持续性动词通常使用进行时态。
例如：While they were waitingfor the New Year。
they listened to music。
sang songs and had fun.Till and until are used to introduce time clauses in affirmative sentences。
with the main clause verb being a continuous n or state that lasts until the time XXX: XXX。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
1. be doing sth.…when …正在做某事时突然… Eg. He was still smiling when the door opened
and his wife came in. 正要做某事时突然… 2. be about to do sth. …when … Eg. We were about to start when it began to rain. 3. had not/hardly/just done sth. when … Eg. He hadn’t/hardly fallen asleep when the telephone rang. 4. had just done …when … Eg. He had gone to bed when the t型 ▲……之后……才：
It was a long time before I got to sleep . ▲不知不觉，还没弄清就---：
Several weeks had gone by before I realised it. ▲不等……就：
Before I could get in a word, he had measured me. ▲It was /wasn’t +一段时间 + before 从句 （过了多
久才/没过多久就---） It will / won’t + 一段时间 + before 从句 （还要过
多久才/用不了多久就---）
1.He didn’t arrive home _____ 7 o’clock. 2.It was at 7 o’clock ____ he arrived home. 3.It was 7 o’clock ____ he arrived home. 4.It has been 7 hours ____ he arrived home. 5.It was 7 hours ____ he arrived home. 6.It wasn’t 7 hours ____ he arrived home. 7.It will be 7 hours ____ he arrive home. 8.It won’t be 7 hours ____ he arrive home.