before 句型

When, before, since 句型1. when 的句型(1) be doing sth….when…正在做某事时…突然…We were swimming in the pool when it began to rain.We were studying English when he came in.(2) be about to do sth…. when …正要做…突然…We were about to leave when he came in.(3) had hardly/scarcely/just done sth…. when…刚…就…We had hardly finished the work when he came in.(4) when=now=since 表示“既然”It was foolish of you to take a taxi when you could get there in 5 mins. Now you are here, you’d better stay.2. before 句型(1) it will be + 时间段+ before sb. do sth. 再过多久…才…It was +时间段+before sb. did sth. 过了多久…才…It won’t be long before sb. do sth. 过不了多久某人就会…Eg. It will be 1 year before we go to college.It was 4 years before we graduated.(2) 主语+had done/did sth.+时间段+ before +did sth. 过了…才e.g. We had sailed for 4 days before we found the island.We waited a long time before the train arrived．我们等了很长时间火车才到。

1. 表示“在„..之前就„..”。 Mary had finished her homework before her mother returned. 2. 表示“过了多久后才„„.. ，动作进行到什么程度才„„” The man almost knocked me down before he saw me . They walked about 30 miles to the west before they saw a village . They worked day and night about three days before everything returned to normal . 3. 表示“来不及； 尚未„..就„” (与情态动词can\could连用) Before I could get in a word , he had measured me . He ran off before I could stop him . She left the company before I could have a word with her . 4. 表示“刚„就„” I had hardly sat down before the bell rang. 5. 表示“不知不觉就„..； 还没弄清就„„” Time passed quickly and three months went by before he knew it. 6. 表示“宁愿„，决不„，与其„，毋宁„.”常与will 或would 连用。 I would die before I would tell I’d shoot myself before I apologized to him. I would / will die befoo it now before you forget . I will write it down before I forget it . 8. 用于句型“it was +时间段+ before …” 表示 “过了多久才…” It was three days before he came back. . 9. 用于句型 “ it was not long +时间段+ before …” 意为“不久就….” It was not long before he sensed the danger of the position . 10. 用于句型“it will be (not )+时间段+ before….”表示“要过多久/ 不 久…才…” It will be half a year before you graduate from this school . It will be not long before you find you are wrong .

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。

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。

时间状语从句before 和since的用法before 和since的用法1.连词before表示“还未...就...；不到...就...；...才...；趁...还没...”Before they reached the station, the train had gone.他们(还没)到达火车站前，火车已经开走了。

We hadn’t run a mile before he felt tired.我们跑了还不到一英里他就累了。

Please write it down before you forget it.趁你现在没忘把它记下来。

2.before的句型：It will be +时间段+before从句，表示“多久之后才”。

It won't be long +before从句，表示“不久之后将...”It will be half a year before I come back.半年后我才回来。

(一般现在时表将来)It won’t be long before we meet again.不久后我们将再见面。

3.since的句型：It is/has been+时间段+since从句。

若从句的谓语为非延续性动词，表示“自从动作开始以来有多久了”；若从句的谓语为延续性动词，表示“自从动作结束/完成...有多久了”，常译为“自从不...有多久了”。

It is three years since the war broke out.战争爆发以来，有三年了。

It is twenty years since I've seen her. 我已经二十年没见她了。

五、every time, each time, next time, the first time, any time, all the time 的用法这些短语用来引导时间状语从句，表示“每当..；每次...；下次...”等。

掌握before 的用法一、 before用作连词1. before用作连词时，意思是“在……之前;还没来得及…… 就”。

例如：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。

2. 用于It + be + 时间段 + before...句型中，意思是“过多久---才……”。

如果主句中用否定式，则表示“不久……就”。

例如：It will be five years before I come back.我五年后才能回来。

It was not long before the enemy was driven out of their country.不久之后，敌人就被赶走了。

It won’t be long before they understand e ach other.他们不久就会互相了解的。

3 用于肯定句中，强调主句所表达的时间，距离长，或花费的精力大，表“才”We had sailed four days and four nights before we saw lands.4用于否定句中，强调主句所表达的时间，距离短，或花费的精力小，表“不到---就”We hadn’t run a mile before he felt tired.5. 还有“趁……(还没有)”之意。

例如：They are thinking of buying the house before the prices go up.他们正在考虑趁房价未涨时把房子买下来。

Do it before you forget it. 趁早动手，以免忘了。

5. 有时还有“宁愿”的意思Eg: I would rather die before I apologized to him.二、before用作介词before用作介词时, 可以指时间“earlier than在……之前”，也可以指位置“in front of在……之前”。

before句式考法
before
• before常用于以下句型 • It will be/do +时间段 +before +句子（一般现在
时）：要过多久...才... • It will be three days before they arrive. • It was +时间段+before+句子（一般过去时）：
• It is/has been +一段时间+since +句子（一 般过去时）“自从...到现在有多长时间了”
• 自从我大学毕业到现在已有7年了。
• It is / has been 7 years since I graduated from college.
• I. It was a long time ______ I realized only by trusting each other can we keep a good relationship with others.
• 2. It will take several years ______ most homes use this new technology.
多久之后...就... • It was just 2 days before the book was
publiched.
翻译一下
• 1.再过一年，我们才毕业。 • It will be one year before we graduate. • 2.没过多久，我们就知道成绩了。 • It wasn’t long before we knew th

8. Before 还有 “趁着…没”的意思.
I must write it down before I forget it. We want to buy something now before prices go up. Study before it is too late.
区别：
It + be + 一段时间 + before-clause 这个句型中的时间一般为表示一段时间 It + be +一段时间 + since-clause 表示从since 从句谓语动作发生以后到现在或过去 所经过的一段时间，意为“自从......以来已多久了” It will be one month before we become the students of Grade three. It was just a week before he came back It is three years since his father passed away . It was years since I had seen her.
3.The America Civil War lasted four years ______ the North won in the end. A.after B.before C.when D. then
(2005广东)
4.It was some time _______ we realized the truth. (2005山东) A. when B. until C. since D. before
before 与 高考
1.表示”在…之前”
We must find a hotel before dark. (表时间) He walks.强调从句的动作发生的很慢或 晚. It will be years before we meet again. He almost knocked me down before he saw me.

句型意义备注It will/won’t be+ 时间段+before…要等多长时间才……/过不了多长时间就……It was/ wasn’t + 时间段+before…过了多长时间才……/没过多长时间就……It is/has been + 时间段+since 自从……以来已经有多长时间了1.从句中用短暂性动词表示动作持续了多久2.从句中用延续性动词表示动作结束了多久3.从句要用一般过去时It will be two years before he comes back from abroad. 要等两年他才回国。

It won’t be two years before he comes back from abroad. 过不了两年他就回国。

It was two years before he came back from abroad. 过了两年他才回国。

It wasn’t two years before he came back from abroad. 没到两年他就回国了。

It is/has been two years since he came back from abroad. 他回国已经两年了。

It is/has been two years since he lived abroad. 他不在国外已两年了。

How long do you think it is _________ he arrived here?-- No more than half a year, I believe.It was two years later _______ he came back from abroad.It is two hours ______ he spends on English every day.It was at 6 o’clock _______I got up today.It was 6 o’clock _______ I got up today.1. It is / was (high / about) time +(that)… “是做……的时候了”，从句的谓语动词用：①过去式（be用were）② should+ 动词原形，should 不可省,表示虚拟语气。

答：一、掌握before热点用法1. prep. 在......以前，强调时间He came to see me the day before yesterday. 他前天来看我了。

2. prep. 在......前面，当着......的面，向......，强调地点She has to appear before the court. 她必须出庭受审。

3. prep. 在......之前，先于，强调次序Those with babies can get on the bus before others. 带小孩的人可以先上汽车。

4. prep. 与其......（宁愿）I'd shoot myself before I apologized to him! 我宁死也不向他道歉!5. adv. 以前，强调时间We've seen that film before. 我们以前看过那场电影。

6. adv. 在前面，向前，强调位置Don't run before and after. 别跑前跑后。

7. conj. 在......前，强调时间before的含义比较灵活，实际翻译时应结合具体情况机动处理。

1. 趁......You should do it before it is too late. 趁现在还不算太晚，你应该赶快做它。

2. 尚未来得及Before she could move, she heard a loud noise, which grew to a terrible roar. 她还没有来得及动弹，就听见有很响的声音，接着就成了可怕的隆隆轰鸣声。

Before they reached the house, a new great wave came, sweeping down trees, and sweeping them down too. 他们还没到屋子，又一个巨浪打来，冲倒了树，也冲倒了他们。

before时间状语从句用法
before引导的时间状语从句的用法主要包括以下几点：
1.before引导的时间状语从句可以表示主句动作发生在从句动
作之前，意为“先于…”或“…之后才”。当主句是将来时时，从句
谓语动词须用现在时；当主句是一般过去时或过去完成时时，从句常
用过去时。
2.before引导的从句常用省略句型，同样表示主句动作发生在
从句动作之前。
以上是before引导时间状语从句的基本用法，供您参考。在实
际应用中，还有其他的用法和搭配，建议您查阅语法书籍获取更全面
而准确的信息。

•
• • • •
--- why didn’t you tell him about
the meeting? --- He rushed out of the room ___ I could say a word. (我还没来得及说他就冲出了房间)
• A. before B. until C. when D. after
• 不久我们就会再见。
• • • • •
扩展 We waited long before he turned up. 我们等了很久他才出现 It took many years before they got married. 很多年后他们才结婚了。
2. 表示从句中的动作还未发生，“不等…就”
“还没来得及…” ,常有can, could. • Before I could get in a word, he had left.
•
•
It will + 一段时间 + before 从t was four years before we met again.
• 过了四年我们才再次见面。
• It will be 4 years before we meet again.
• 四年之后我们才会再见面。
• It wasn’t +not long + before 从句过去时 • It won’t + not long + before 从句现在时 • (不久就） • It was not long before he turned up. • 不久他就出现了。 • It won’t be long before we see you again.
写作好句

名校版高考英语语法考点解析before与完成时态连用解析1.与现在完成时态连用，表示“从现在开始追溯到过去的一段时间”，如：I think we've met before.我觉得我们以前见过面。

My brother has never been abroad before.我的哥哥以前没有去过国外。

I've been here before.我以前来过这儿。

Have you ever used this software before?你以前用过这种软件吗？Have you heard about it before?你过去听说过这件事吗？I have never met him before.我以前从未见过他。

I’ve never heard that word before.我以前从没有听过那个词。

2.与过去完成时连用，表示“从过去的一个时间点算起的以前”，如：The war had ended only a month or so before.战争大约一个月前才刚刚结束。

It had been fine the week before (= the previous week) .前一个星期天气很好。

That had happened long before (= a long time earlier) .那是很早以前的事了。

He said that he had met the man somewhere before.他说他以前在什么地方见过这个人。

Several weeks had gone by before I realized the painting was missing.几周之后，我才意识到那幅画丢了。

We went to that movie a few nights ago. We hadn’t gone to that before.几天前的晚上我们去了那家电影院。

举一反三 能力提升
（2011·四川卷，6）As it reported, it is 100 years ____Qinghua University was founded． A. when B. before C. after D. since
It is/It has been+一段时间+since从句
It was not long before we met again.
探究例句 归纳句型
整理笔记
*it引导，it指时间。
It will be/take +一段时间+before从句
*it后加一段时间（含long）。
It will not be/take +一段时间+before从句
*谓语动词为系动词be(或实 义动词take)，用一般将来时
学法点津---高中英语特殊句型难点突破
♫ 用喜爱和熟悉的旋律（包括汉语歌曲）演唱含某一特殊句型的 经典例句，激发学习英语句型的兴趣； ♫ 通过探究经典例句归纳句型结构，梳理句型特点，整理笔记； ♫ 通过例句汉语翻译领会句型的含义，完善笔记；
♫ 能学以致用，在高考真题的语境中真正理解该句型的用法； ♫ 能举一反三，拓展延伸，进一步领会和灵活运用该句型； ♫ 理解并掌握该句型的特殊用法之后，再次唱响含该句型的例句， 在享受音乐的同时牢记特殊句型。
It was/took +一段时间+before从句
或一般过去时。
It was not/did not take +一段时间+before从句
翻译例句 领会含义
It will be long before we meet again. 要过很久我们才会见面。 It will not be long before we meet again. 不久我们就会见面。

1.表示在“… 之后… 才”,用于肯定句中，强调主句表达的时间 /距离之长或花的精力之多。

We had sailed for a month before we saw the land. 我们航行了一个月才看到陆地。

It was long before we met again. 过了很久我们才见面。

2. “不到…就”，用于否定句中，强调主句表达的时间 /距离之短或花的精力之少。

It will not be long before we meet again. 我们不用多久就能见面了。

3. 表示…“ 还没来得及… 就… ”从句动作发生前，主句动作已发生—Why didn't you tell him about the meeting? — He rushed out before I could say a word. 我还没来得及说一句话，他就冲了出去。

4. 表示趁“… ”，以“免… ”，或“没等…就”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。

Take the address down before you forget.5. 表示“宁可，宁愿”，相当于 rather thanHe was such a proud man that he would die before he would admit he was wrong.6. It + will be + 时间段 + before sb.do... 要过多久才…(注意前后时态)e.g. It will be many years before the situation improves.否定: It will not be +时间段+ before sb.do …不久就…，过不了多久就…e.g. It will not be long before we meet again. 我们不用多久就能见面了。

before前后的时态用法以《Before前后的时态用法》为标题，写一篇3000字的中文文章Before是英语中常见的词语，它在各种场合里使用频繁，因此了解它的用法和意义非常重要。

本文将讨论“before”前后的时态用法，以加深对它的理解和使用。

首先，就before的基本用法而言，它的主要作用是表示时间长短，经常会与后面的动词搭配，以表示前者发生在后者之前。

例如“I`ll call you before I leave.”（我离开前会跟你联系）。

在实际使用过程中，before可以与后面的动词形成不同的时态组合。

比如在现在完成时中，可以用“had+done”搭配使用，如“I had finished the work before you came.”（你来之前我已经做完了这项工作）；如果用在一般过去时中，可以用“did+do”搭配，如“I finished the work before he did.”（我比他做完了这项工作）。

另外，在动词后面使用before还有另外一个用法，那就是表示某事即将发生，或者发生在某个时间点之前，例如“I leaving tomorrow, so I need to finish this project before then.”（我明天就要走了，所以我得在明天之前完成这个项目）。

这种用法的重点在于表达在以后的某个特定时间之前要完成某件事情。

此外，有时候，before也可以被用在will和shall之前，表示某事即将发生，例如“Before will/shall be too late, I will do my best.”（在准备太晚之前，我会尽力去做），这样的句型表达的是某件事情要在某个特定的时间点之前发生，所以用before更加流畅，更加地道。

在现在完成进行时中，before也可以被当作连接词，表示两个活动发生在同一个时间段内，如“I have been studying all morning, before I have lunch.”（一整个上午我都在学习，然后我吃午饭）。

before的用法总结(1) “before”作为连词的用法：其基本含义是“在…之前”，也可以根据语境的不同灵活翻译成“才”、“还没来得及就…”、“就”等等含义。

1）与情态动词can / could 连用，这时从句虽为肯定形式，根据汉语习惯译成“还没来得及就”，强调从句动作发生之前主句的动作已经发生。

Before I could get in a word, he had measured me.Before she cold move, she heard a loud noise, which grew to a terrible roar.2)用于肯定句中强调主句所表达的时间、距离长，或花费的精力多，译成“才”；We had sailed four days and four nights before we saw lands.We waited a long time before the train arrived.3)用于否定句中，强调主句所表达的时间、距离短，或花费的精力少，译成“不到…就”；We hadn’t run a mile before he felt tired.4) 主句含有hardly、scarcely等半否定词时，可以译成“刚…就”，这时主句过去完成时，从句过去时，且可以用when 替代before;We had hardly / scarcely reached the school before / when the bell rang.5) 有时before还有“宁愿”的意思；I’d shoot myself before I apologized to him.6) 用于It be / take some time before + 句子，这时要根据主句的时态分两种情况：(1)若主句为一般将来时，从句是一般现在时。

主句是肯定句译成“要过很多时间才…”；主句是否定句译成“用不了多久就…”。