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before的用法是很多的人都比较想要了解的，在众人的心中before的用法是比较难的，我们都非常想要去了解before的用法，但是又谈何容易呢?为了让大家更加快速的了解before的用法，下面我们就和教师一起去看看吧，希望对大家有所帮助。
prep.在……之前;先于，优于;当着……的面;与其……conj.在……之前;在……以前;比……早些;与其……adv.先前，从前;在前，在前方before一词含义广泛，是高考考查的热点词汇之一，但部分考生对该词的用法模糊不清。
为了帮助大家掌握，现就对before的用法归纳如下：一、before用作连词1. before用作连词时，意思是“在……之前;还没来得及…… 就”。
强调主句或从句谓语动词表示的动作发生得过早或过快｡例如：Before she could move, she heard a great noise, which grew to a terrible roar. 她还没来得及动弹，就听见有很响的声音，接着就成了可怕的隆隆轰鸣声。
Before I could say a word, she had stormed out of the room. 不等我说一句话，她就冲出了房间。
Don’t count your chickens before they are hatched. 不要高兴得过早。
I must finish my homework before I watch TV.我必须做完作业才能看电视。
It still took seven years before they finally got married. 过了七年他们才最终得以成婚。
It will be only a few minutes before she comes back. 她过几分钟就会回来。
He announced the ending of the meeting before I could get in a word. 没容得我插上一句话,他就宣布散会了｡Someone called me up in the middle of the night, but they hung up before I could answer the phone.有人半夜给我打电话,但我还未来得及接他就把电话挂断了｡They had talked only a few minutes before they found they were quite different in opinion.他们才谈了几分钟就发现他们的意见很不一致｡注意：before从句若是一个将来的动作，则用一般现在时代替一般将来时，如上句中的comes。
在语法填空和短文改错中it+be+时间+从句是一个常考的句式，可是学生常常会因为判断失误而选错从句的关联词。
其实只要细心这一句式还是有规律可循的。
1. It was / will be +时间段+before...表示“过多长时间才......".在否定句中，表示”没过多长时间就......“。
如：It will be two years before we get married. 我们要过两年才结婚。
It was not long before he left. 不久之后他就走了。
2. It is / has been +时间段+since... 表示”自从......以来有......时间了",此时从句时态常用一般过去时。
It is just a month since I moved here. 我搬到这儿刚好一个月。
It has been ten years since we lived here. 我们没住这儿已经十年了。
3. It was / will be + 时间点+ when...It was seven o'clock when I got to school this morning. 我是早上七点到学校的。
4. It is / was +时间状语+that... 这是强调句型的考查It was at six o'clock this morning that they set out. 他们是在今天早上六点动身的。
5. It is / was + not until... + that ... 这个句式考查的也是强调句型It was not until he took off his sunglasses that I recognised that he was a famous film star. 直到他摘下眼镜我才认出他是一个著名的影星。
高考It++be++时间+++从句”结构总结第一篇：高考It++be++时间+++从句”结构总结高考It +be+ 时间 + 从句”结构总结一在“ It +be+ 时间+ 从句”结构中，引导从句的从属连词有before, that, since, until（till）, when 等。
这一结构是近几年高考常考的知识点，现将它们的用法小结如下：一、It +be（not）+ 时间段 +before 从句。
其中的主句是肯定式时，意为“过多长时间才……”；主句是否定式时，意为“没过多久就……”。
例如：1.It was not long before the whole country rose and drove the Austrian soldiers from their homeland.不久，全国人民便奋起反抗，把奥地利军队从他们的国土上赶了出去。
2.It may be five or six years before the new medicine is tested on human beings.要过五六年时间这种新药才能在人身上做试验。
3.It was two months before he designed the bridge.过了两个月，他设计出了这座桥梁。
二、It +will be（was）+ 时间段 +until 从句若主句中用一般将来时，则从句中用一般现在时，意思是从现在起到从句中谓语动词表示的动作发生时还有多长时间；若主句中用一般过去时，则从句中也用一般过去时，意思是从过去某一时间起到从句中谓语动词表示的动作发生还有多长时间。
例如：1.It will be ten days until my birthday comes.到我生日还有十天。
2.It was only five minutes until her husband came back from work.当时离她丈夫下班只有五分钟了。
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)。
It will be … before…“过…才”
It is… since…“自从…已经有多久”
Sep 7, 2015
一.It will be … before…“过…才”
1.It will be fifteen minutes before class is over.
还有15分钟才下课。
2.It will be nine months before we graduate from school.
过9个月我们才能毕业。
3.It will be four years before we meet again.
过四年我们才能再见面。
4.It will be years before a child can really do something
for his family.
要过很多年一个孩子才能真正为家里做点事。
二.It is… since…“自从…已经有多久”
1.It is two years since I came to this school.
我来这所学校已经2年了。
2.It is two years since I left junior middle school.
我从初中毕业已经两年了。
3.It is 30 years since I began my career as a teacher.
我的教师生涯已经有三十年了。
4.It is three months since I last met my daughter.
我已经有三个月没和女儿见面了。
高考It +be+ 时间+ 从句”结构总结一在“It +be+ 时间+ 从句”结构中，引导从句的从属连词有before, that, since, until （till ）, when 等。
这一结构是近几年高考常考的知识点，现将它们的用法小结如下：一、It +be （not ）+ 时间段+before 从句。
其中的主句是肯定式时，意为“过多长时间才……”；主句是否定式时，意为“没过多久就……”。
例如：1. It was not long before the whole country rose and drove the Austrian soldiers from their homeland. 不久，全国人民便奋起反抗，把奥地利军队从他们的国土上赶了出去。
2. It may be five or six years before the new medicine is tested on human beings.要过五六年时间这种新药才能在人身上做试验。
3. It was two months before he designed the bridge. 过了两个月，他设计出了这座桥梁。
二、It +will be （was ）+ 时间段+until 从句若主句中用一般将来时，则从句中用一般现在时，意思是从现在起到从句中谓语动词表示的动作发生时还有多长时间；若主句中用一般过去时，则从句中也用一般过去时，意思是从过去某一时间起到从句中谓语动词表示的动作发生还有多长时间。
例如：1. It will be ten days until my birthday comes. 到我生日还有十天。
2. It was only five minutes until her husband came back from work.当时离她丈夫下班只有五分钟了。
注意：结构“一”与结构“二”在肯定句中几乎可以通用。
it will be 时间段before 从句"it will be + 一段时间+ before" 是一个句型，用于表示某事在一段时间之后才会发生或完成。
这个结构用于表达时间上的延迟或预计的持续时间。
以下是几种常见的用法：一、表示某事需要一段时间才能完成：例句：It will be hours before we arrive at our destination.（我们到达目的地还需要几个小时。
）It will be weeks before the construction project is finished.（建筑工程完成还需要几周的时间。
）二、表示预计需要一段时间才能实现某个目标或达到某个状态：例句：It will be months before I can speak fluent French.（我要花几个月的时间才能说流利的法语。
）It will be years before he becomes a professional musician.（他要过好几年才能成为一名专业音乐家。
）三、表示时间上的延迟或等待：例句：It will be a while before the food is ready.（食物还需要一会儿才能准备好。
）It will be some time before we hear back from the committee.（要过一段时间我们才会收到委员会的回复。
）请注意，这个句型中的"before" 后面可以接一段具体的时间，如"hours"、"weeks"、"months"，或者使用表示时间长度的表达，如"a while"、"some time"。
具体使用哪种形式要根据具体情况和所要表达的时间长度来确定。
before 在英语中是一个比较常用的虚词，它既可作介词或副词用，也可作附属连词用。
在近几年的高测验题中通常出现考察其附属连词用法的标题。
下面就把before 作附属连词的用法归纳如下： 1. 表现“在……之前就……”。
比方：Mary had finished her homework before her mother returned.在她妈妈返来之前玛丽就已经完成了作业。
2. 表现“过了多久后才……；举动举行到什么程度才……”。
比方：The man almost knocked me down before he saw me.那个男子差点把我撞倒才望见我。
They walked about 30 miles to the west before they saw a village.他们西行了大略30 英里才望见一个墟落。
They worked day and night about three days before everything returned to normal.他们昼夜劳动了大略三天，一概才收复平常。
3. 表现“来不足；尚未……就……”。
比方：Before I could get in a word, he had measured me.我还没来得及插话，他就已经给我量好了尺寸。
He ran off before I could stop him.我还没来得及禁止他，他就已经跑了。
She left the company before I could have a word with her.我还没来得及和她打声招呼，她就已经脱离了。
4. 表现“刚……就……”。
比方：I had hardly sat down before the bell rang.我刚坐下铃就响了。
5. 表现“无声无息就……；还没弄清就……”。
比方：Time passed quickly and three months went by before Aqiao knew it.时间过得很快，无声无息阿巧已经度过了三个月。
It + will be + 时间段 + before等表示“在……之后……才”的句型总结
一、用于句型“It + will 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……”。
Before 后的句子中用一般现在时态。
其否定形式“It will/would not be +时间段+ before…”表示“不久就……，过不了多久就……”。
【典型考例】
（1）The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.（2007安徽卷）
A. after
B.
before C. since D. when
（2）—How long do you think it will be ______China sends a manned spaceship to the moon? （2006福建卷）
—Perhaps two or three years.
A. when
B. until
C.
that D. before
（3）It ________ long before we _______ the result of the experiment.( 上海春招2002)
A. will not be...will know
B. is...will know
C. will not be...know
D. is...know
(4) Scientists say it may be five or six years_________ it is possible to test this medicine on human patients. （2004福建）
A. since
B. after
C.
before D. when
解析：答案为BDCC。
考题
（1）(2)before 用于肯定的“It + will be + 时间段 + before...”句型中，表示“要过多久…才…”。
（3）before在本题中用于否定句,意为“过不了多久就会……”, 状语从句要用一般现在时代替一般将来时，可知C项为正确答案,句意是:要不了多久我们就会知道试验的结果了。
（4）宾语从句中含有句型“It + may be + 时间段 + before...”，表示“也许要过多久才……”，故选择答案C。
二、用于句型“it was +时间段+ before …”表示“过了（多长时间）才……”。
其否定形式“ it was not +时间段+ before …”意为“不久就……”, “没过（多长时间）就……”。
【典型考例】
It was some time ___________we realized the truth. （2005山东）
A. when
B. until
C.
since D. before
解析：答案为D。
before用于句型“it was +时间段+ before …”表示“过了（多长时间）才……”。
该题题意是“过了一段时间我们才意识到事情的真相”。
故正确答案为C项。
表示“在……之后……才”。
副词“才”在汉语中强调某事发生得晚或慢。
如果在含有before从句的复合句中，强调从句动作发生得晚或慢时，就可以应用这种译法。
【典型考例】
The American Civil War lasted four years _______ the North won in the end.(2005广东)
A. after
B.
before C.
when D. then
解析：答案为B。
本题考查连词before表示“在……之后才……”之的用法，根据本句含义“美国南北战争持续了四年，北方才最终取得胜利”，可知本题应选B。
三、表示“……还没来得及……就……”。
目的在于强调从句动作发生之前，主句动作已发生。
【典型考例】
—Why didn't you tell him about the meeting? ( 2006四川卷)
— He rushed out of the room _________ I could say a word.
A. before
B.
until C. when D. after
解析：答案为A。
本题考查连词before表示“……还没来得及……就……”的用法。
句意是“我还没来得及说一句话，他就冲出了房间”。
四、表示“在……之前就……”。
这时主句与before从句中的两个动作按时间先后依次发生。
【典型考例】
It was evening______ we reached the little town of Winchester. （2004天津）A. that B. until C.
since D. before
解析：答案为D。
本题考查连词before表示“在……之前就……”的用法。
句意是“我们到达小镇Winchester之前就已经是傍晚时分了”。
五、表示“趁……”，“等到……”，或“没等……就……”等。
【典型考例】
He made a mistake, but then he corrected the situation _____ it got worse.（2003北京）
A. until
B. when
C.
before D. as
解析：答案为C。
由made a mistake和转折词but可知本题句意是“他出了差错, 但没等其进一步恶化，他就调整了局势”。
故正确答案为C项。
六、和hardly，scarcely连用，表示“刚一……就……”。
该结构主句常用过去完成时，当hardly位于句首时，要用倒装语序，例如：
I had hardly sat down before the telephone rang.=Hardly had I sat down before the telephone rang.
We had scarcely reached the school before it began to rain.= Scarcely had we reached the school before it began to rain我们刚到学校天就下雨了。
我刚一坐下电话就响了。
七、和其它相似句型的区别
有时候before引导的时间状语从句与since，when引导的时间状语从句在下列结构中较相似，容易混淆。
“It be +时间段 + since引导的时间状语从句”表示“自从……已经有多长时间了”。
主句用一般现在时或现在完成时。
“It be +时间点 +when引导的时间状语从句”表示“某个动作发生时，是某个时间”。
主句谓语动词可以是一般过去时，也可以是一般将来时。
【典型考例】
（1） It is almost five years we saw each other last time. （2005北京春）
A. before
B. since
C.
after D. when
（2）— Did Jack come back early last night? （2005福建）
— Yes. It was not yet eight o’ clock________ he arrived home.
A. before
B.
when C. that D. until
解析：答案为BB。
考题（1）考查的是“It be +时间段 + since引导的时间状语从句”结构，句意是“自从上次我们见面以来已经近五年没有见了”，故选择答案B。
考题（2）考查的是句型“It be +时间点 +when引导的时间状语从句”，句意是“他昨晚回家时还不到8点”，故选择答案B。
八、before long和long before的区别
before long意为“不久，很快”（其中before是介词，long是名词），常在句中作状语，多与动词的过去时或将来时连用。
例如：
The work will be finished before long. 工作不久就会完成。
Before long he had to move on again. 不久，他被迫再次迁移。
long before意为“很久以前”（其中long是副词。
long before单独使用时，before 是介词；long before后接从句时，before是连词。
）这个词组常与过去时或过去完成时连用，跟从句时也可用在一般现在时的句子中。
例如：
She said that she had heard of it long before. 她说她早就听说过此事。
It will be long before he arrives. 还要等很久他才能到达。
