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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,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。
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。
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。
Before 用法小结一、作连词，引导时间状语从句1、把 before 译成“在… …之间”，这时主句与 before 从句中的两个动作按时间先后依次发生。
如：It was evening before we reached the little town of Winchester. (在他们到达小城镇之前就是晚上了。
)2、把 before 译成为“以后……才”，副词“才”在汉语中强调某事发生得晚或者慢。
如： The American Civil was lasted four years before the North won in the end. (美国南北战争持续了四年之后北方才最终取得了胜利。
)3、把 before 译成“不久……就”，目的在于强调主句动作发生在从句的动作以前。
如： ---Why didn’t you tell him about the meeting？ ---He rushed out of the room before I could say a word. (我还没来及说一句话，他就冲出了房间。
)4、把 be f o re 译成“尚未”，“还没有”，“来不及”，“不要”，“别”。
如； T a ke i t before you change your mind. (买了吧，不要三心二意。
) The hawks all had flown away before we fired a shot. (我们还没有来得及发一枪，老鹰全都飞了。
) I started my meal before Adam arrived. (亚当尚未达到，我就开始吃饭了。
) He made a mistake， but then he corrected the situation before it got worse. (他出了差错，但没等其进一步恶化，他就调整了局势。
状语从句（一）时间状语从句表示时间的状语从句可由1. when ,while, as1) when 句型：(1) Sb. was /were doing sth ---- when(suddenly) sb. did sth.---(2) Sb. was /were about to do sth. ---- when(suddenly) sb. did sth.---(3) Sb. had just done sth. ---- when(suddenly) sb. did sth.---1）She had just finished her homework her mother asked her to practice playing the piano yesterday.2）(短改）Jasmine was holidaying with her family in a wildlife park while she was bitten on the leg by a lion.2.There’s no way of knowing why one man makes an important discovery ______another man, also intelligent, fails.3) time goes by, computers are playing an increasingly important role in our daily life.2. until /tillI didn’t leave there until he came back.Not until .It was not until .It was not until midnight they reached the camp site.3. immediately ,instantly, directly /as soon as /the moment ,the minute ,theinstant /on doing Hardly /Scarcely ......when....../ No sooner ....thanHardly had sb. done sth. --- when sb. did sth. –The moment I saw him, I gave the book to him.（短改）He had no sooner finished his speech when the students started cheering.4. before 句型：(1) before sb can/ could … 某人还没来得及……例：Someone called me up in the middle of the night，but they hung up ____ I could answer the phone.(2) It will(would/may) be +时间段+ before(3) It was +时间段+ before1. I’m sorry you’ve been waiting so long，but it’ll still be some time ____Brian gets back.2.John thinks it won’t be long ______ he is ready for his new job.3. It was a busy morning, about 8:30, when an elderly gentleman in his 80s came to the hospital.I heard him saying to the nurse that he was in a hurry for appointment （约会）at 9:30.The nurse had him take a 36 in the waiting area, 37 him it would be at least 40 minutes 38 someone would be able to see him .36.A.breath B. test C. seat D. break37.A.persuading B. promising C. understanding D. telling38. A. if B. before C. since D. after5. since 句型：(1) S + 现在完成式since + S + 过去式例句：He has worked very hard since he went to senior high school.(2) It is/has been + 时间段--- + since + S + 过去式As it reported, it is 100 years ______ Qinghua University was founded.(短改）Most people can quickly get help from a doctor or go to a hospital since they are ill. (全国卷)6. time 句型：(1) the first time 例：I thought her nice and honest the first time I met her.(2) It is ／was the first／last／second ／third time ＋从句（完成时态）例：This is the first time I have been here 这是我第一次到这儿。
before的句型结构
"before"这个词的句型结构可以有多种，以下列举几个例子：
1. Before + 主语（句子）：表示某个事件或行动在另一个事件或行
动之前发生，例如：Before I go to bed, I always brush my teeth.（我睡觉之前总是刷牙。
）
2. Before + 名词 / 代词：表示在某个时间点之前发生的事情，例如：Before the concert starts, we have time to grab a coffee.（音
乐会开始之前，我们有时间去买杯咖啡。
）
3. Before + 现在分词 / 过去分词：表示在某个事件或行动之前正在
或已经发生的事情，例如：Before boarding the plane, we need to go through security.（登机之前，我们需要通过安检。
）
4. Before + 不定式：表示某个行动或事件在另一个行动或事件之前
完成，例如：Before starting a new project, I like to
brainstorm ideas.（开始一项新项目之前，我喜欢先集思广益一些想法。
）。
before 时间状语从句句型"Before" 在时间状语从句中通常表示某个动作或事件发生在另一个动作或事件之前。
以下是八个使用 "before" 的时间状语从句的例子：1.基础句型：简单陈述一个事件在另一个事件之前发生。
We will finish the project before the deadline.我们会在截止日期之前完成这个项目。
2.与现在完成时连用：表示一个动作在另一个动作之前已经完成。
I have already eaten dinner before watching TV.我在看电视之前已经吃过晚餐了。
3.与过去完成时连用：表示过去的某个动作在另一个过去的动作之前已经完成。
They had finished their homework before going out to play.他们出去玩之前已经完成了家庭作业。
4.否定句：表示某个动作没有在另一个动作之前发生。
She didn't leave the house before the phone rang.电话响之前她没有离开家。
5.使用 "before long"：表示不久之后会发生某事。
Before long, the news spread throughout the town.不久之后，这个消息传遍了整个城镇。
6.与条件状语从句连用：表示在某个条件满足之前，另一个动作不会发生。
We won't start the meeting before everyone has arrived.在每个人到达之前，我们不会开始会议。
7.使用 "before someone can do something"表示某个动作在某人有机会做某事之前就发生了。
The thief ran away before anyone could stop him.小偷在任何人能阻止他之前就逃跑了。
itwillbebefore的三个句型句型1：It will be before (时间) when (条件/情况)。
参考内容：It will be before the end of this year when we can expect the completion of the new office building. The construction project has progressed smoothly, and all major milestones have been achieved. With just a few finishing touches remaining, the building is well on track to be ready for occupancy before the anticipated deadline. The team has been working diligently, ensuring that all building codes and safety regulations are met to guarantee a secure and functional workspace.The design team has successfully integrated sustainable features into the building's architecture, making it energy-efficient and environmentally friendly. Solar panels have been installed on the roof, providing a renewable energy source for the office's energy needs. Additionally, rainwater harvesting systems have been implemented to reduce water consumption, while ample natural lighting and ventilation have been incorporated to create a pleasant and comfortable working environment.It will be before the end of this year when the new office building will be equipped with state-of-the-art technology. The IT department is working closely with vendors to ensure the seamless integration of essential systems, such as communication networks, security surveillance, and smart building automation. The aim is to provide employees with the latest tools and technologies toenhance their productivity and efficiency. Furthermore, a robust IT infrastructure will support future growth and scalability for the company.To facilitate a smooth transition, a thorough relocation plan is being developed. The logistics team is coordinating the packing, moving, and unpacking of office equipment and furniture. They are also collaborating with external service providers to handle the setup of utilities and connectivity in the new building. Staff training programs will be organized to familiarize employees with the layout and facilities of the new office, ensuring a seamless transition and minimal disruption to daily operations.In conclusion, it will be before the end of this year when the new office building will be fully operational. The project has been meticulously planned and executed, incorporating sustainable features and advanced technology. The company's commitment to providing a modern and efficient workspace for its employees is evident in the attention to detail and use of state-of-the-art infrastructure. The completion of this project marks an exciting milestone in the company's growth and is a testament to its dedication to excellence.句型2：It will be before long when (事件/结果)。
Before的详细用法总结今日给大家带来Before的用法，我们一起来学习吧，下面我就和大家共享，来观赏一下吧。
Before的用法我们最初接触的Before一般是作为介词使用的，一般表示空间上的“在…之前” 。
例如：The tea has been set before her.茶已经摆在她面前了。
Before作为介词时，需要留意的是，一般不用在表示详细时间的词之前。
比如，两年之前，我们用two years ago，而不能说.efore two years.Before作为介词时，有一个特别用法需要留意，即before long 表示“不久之后”。
例如：Before long he got married.不久之后他就结婚了。
Before作为连词时，一般意为“在…之前”，用来引导时间状语从句。
引导的从句中的动作一般发生在主句动作之后。
Before作为连词时的用法较为简单，详细要点如下：一、主句用一般现在时/一般将来时 ,从句用一般现在时。
例如：You should let me explain what I did before you criticize me.在你批判我之前，你应当让我解释一下我做过什么。
二、主句用过去完成时 ,从句用一般过去时。
一般翻译为“在…之前就… ”。
例如：1.His father had died before he was born.他父亲在他诞生之前就已经去世了。
2.She had finished her homework before her mother returned.她在妈妈返回之前就已经把作业完成了。
三、主句用一般过去时 ,从句用过去完成时。
从句用过去完成时表示一个过去没有完成或没来得及做的、时间挨次在后的动作，常译为“★还没（来得及）…就…★ ”。
例如：1.He rushed out of the office before I had realized what was happening.我还没意识到发生了什么事，他就冲出去了。
时间状语从句例子1. when，while，as 引导的时间状语从句when 既可以指某一时间点，也可以指某一段时间，when 从句的谓语动词可以在主句谓语的动作之前、之后或同时发生。
while 强调一段时间，所以从句的谓语动词通常是延续性的；as 强调主句和从句的动作相并发生，常可译为“一边……一边……”。
Tom pretended to be deaf when I spoke to him.当我和汤姆讲话的时候，他假装耳聋。
While he was doing his homework, his mother was cooking.他做作业时，他的妈妈在做饭。
They talked as they walked along the river.他们沿着河边一边走一边说话。
2. before 引导的时间状语从句(1) " It+be+时间段+before" 意为"……（之后）才”。
It was a long time before I got to sleep again.过了很久我才睡着。
(2) "It not be+时间段+before" 意为”不久就；要不了……就会“。
It won't be long before we take the final exam.不久我们就要期末考试了。
3. since 引导的时间状语从句since 引导的时间状语从句所表示的基本意思是”自……以来“。
I have been looking forward to seeing you since I saw you last.自我上次见到你以来我就一直想见到你。
He has written to me frequently since I was ill.自从我病愈后，他屡次给我写信。
（从句谓语为状态动词）He has written to me frequently since I fell ill.自从我生病以来，他屡次给我写信。
高考英语常考句式——it is +时间 + since (before, when)…请注意以下三个句式的区别和意思上的差异（其中的 is 根据情况可以有其他时态形式）：It is + 时间段 + since…的意思是“自从……以来有一段时间了”。
It is + 时间点 + when…的意思是“当……的时候时间是……”。
It is + 时间段 + before…的意思是“在……之前有一段时间”。
请看以下用例：It’s ten years since they got married. 他们结婚到现在已经十年了。
It was past one o’clock when he came in. 他回来时已经一点多了。
It won’t be long before they understand each other. 过不了多久他们就会互相了解的。
有时翻译可以比较灵活：It’s a long time since I met you last. 好久不见了。
(直译：自上次见到你以来有很长一段时间了。
)It’s about three years since I last played basketball. 我差不多有三年没有打篮球了。
(直译：自从我上次打篮球以来已差不多有三年了。
)请看有关高考题(答案为DDBCDC)：1. That was really a splendid evening. It’s years _________ I enjoyed myself so much. (安徽卷)A. whenB. thatC. beforeD. since2. It was some time _________we realized the truth. (山东卷)A. whenB. untilC. sinceD. before3.—Did Jack come back early last night?—Yes. It was not yet eight o’clock _________he arrived home. (福建卷)A. beforeB. whenC. thatD. until4. Scientists say it may be five or six years _________it is possible to test this medicine on human patients. (福建卷)A. sinceB. afterC. beforeD. when5. It was evening we reached the little town of Winchester. (天津卷)A. thatB. untilC. sinceD.before6. It _________ long before we _________ the result of the experiment. (上海春)A. will not be; will knowB. is; will knowC. will not be; knowD. is; know【全真模拟训练】1. It was about midnight _________ we found the lost child, crying under a tree.A. thatB. untilC. whenD. where2. It's some time _________ I have spoken to you about this matter.A. thatB. unlessC. sinceD. until3. It was ten _________ he stood at aunt’s door and rang the bell.A. whenB. untilC. sinceD. that4. I think it won’t be long _________ they understand each other.A. whenB. untilC. sinceD. before5. How pleased I am tonight! It’s years _________ we had so great a time together.A. whenB. thatC. beforeD. since6. It was some time _________ we realized how important the matter is.A. whenB. untilC. sinceD. before7.—Did you come home very late last night?—No. It was just half past seven _________ I appeared before my parents.A. thatB. whenC. untilD. since8. How time files! It seems like years _________ I last saw you.A. whenB. thatC. sinceD. before9. It’s more than half a century _________ the People’s Republic of China was liberated.A. whenB. thatC. sinceD. after答案：1—5 CCADD 6—9 DBCCwhen〔引导时间状语从句〕具体地说，它有以下几种含义：1．表明一个动作发生的时候，另一个动作正在进行之中。
before四种常见句型Before四种常见句型：使用技巧和例句在英语的日常使用中，我们会经常遇到before这个词汇。
而在句子中，before也可以发挥重要的作用。
为了让读者更好地掌握before在句子中的运用，本文将为大家介绍四种常见的Before句型，并提供使用技巧和详细例句。
1. Before + Subject + Verb这种句型中，Before用于表示在前一件事情完成之前，需要做另外一件事情或者完成在后面的动作。
通常，在这种句型中，Before后面加上的是一个句子。
需要注意的是，这个句子通常有自己的主语和谓语动词，并且连词before要和这个句子中的主语和谓语动词关联起来。
例句：- Before I go to bed, I need to brush my teeth. - Before we start the meeting, we need to reviewthe agenda. - Before he can apply for the job, he needs to complete the online application.2. Before + Noun Phrase这种句型中，Before用于表明在某个事情之前需要完成另外一件事情或者需要进行某个动作。
在这种句型中，before后接的是一个名词短语。
这种句型比较简洁，也比较常用。
例句：- Before the party starts, we need to clean up the house. - Before the deadline arrives, we need to finish the project. - Before the storm hits, we need to take down the patio furniture.3. Before + Gerund这种句型中，Before用来描述在完成某个动作之前需要进行另外一个动作。
