before的用法，关于BEFORE的用法

1，关于BEFORE的用法

头都晕了

表示过去某一时间或动作之前已经发生或完成的动作或存在的状态。句中常用by， before， when， until等词引导的时间状语。它是以过去某一时间为起点，所以过去完成时是一个相对的时态，表示的是“过去的过去”。只有和过去某时间或某动作相比较时才能用到它。谢谢采纳

关于BEFORE的用法

2，before的用法

1、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。2、用于句型“It+will/wouldbe+时间段+before...”句型中，表示“要过多久才…”，也可用于“It+maybe+时间段+before...”，表示“也许要过多久才……”。其否定形式“Itwill/wouldnotbe+时间段+before…”表示“不久就……，过不了多久就……”。3、before和after区别：before作连词意思是在...以前。作介词意思是在...以前；在..前面。作副词意思是以前；以往；之前。after作副词意思有以后；后来。作连词意思是在...以后。作介词意思有在...之后；在后面；关于；追赶；依照。作形容词意思是以后的。

before的用法

3，before 的用法

before作为介词，与after 相反 1.在。。。前面 He is standing before the door.他正站在门前 2.在。。。之前(时间） He left for nanjing the day before yesterday.他前天离开南京。作为连词在。。。之前 Think well before you decide.再做决定前好好想想 I will do it before I forget.

before 的用法

4，请问状语从句中before的用法有哪些

在状语从句中，1＞若表达“还未…就…；不到…就…；…才…；还没来得及…就…”时，需用连词before。如We had not run a mile before he felt tired。我们跑了还不到一英里他就累了。 2＞before从句中谓语不用否定式。如：Before they reached the station，the train had gone。他们到火车站前，火车就已经开走了。 3＞It will be+一段时间+before…，表示“还要多久才…”如 It will be half a year before I come back。半年后我才回来。纯手工打写，望采纳！

5，before的用法

before-副词前 before, ago, forward, in front, earlier on 以前 before, formerly, back 面前 before, in front of 以往 in the past, before, formerly 从前 before, previously, formerly, in the past 先前 previously, before 曾经 once, already, before, at some time in the past 曾 once, before, already, at some time in the past 在先 before, formerly, in the past 早先 previously, before 先头 ahead, before, formerly, in front, in the past, in advance before-介词之前 before 以前 before 以往 before 往时 before before-连词在 ... 以前 before, ere

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，也可作从属连词用。在近几年的高考试题中常常出现考查其从属连词用法的题目。下面就把其作为从属连词的用法归纳如下：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…” 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 Aqiao 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 Id shoot myself before I apologized to him. I would / will die before I surrender .7. 表示“否则；以免” Do 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 .

做介词时，指在…之前，后接名词、动名词。作从属连词时引导时间壮语从句，意为在…之前。意为……才时，常用于It+be+一段时间+before从句。基本就这样，望采纳。

6，before的用法

1.介词，在......以前；在......前面Dotry to get here before dinner.一定要尽量在晚饭前到这儿。2.副词，以前，过去He is as happy as before. 他同以前一样幸福。3.连词，在......之前I must finish my work before I leave.在我离开前我必须把工作做完。老师祝你学习进步！望采纳，多谢！^_^

before的用法是什么

一、before的基本用法1.We plan to finish the adjustment of the equipment before Sunday.我们计划在星期日以前完成设备的调试工作。2.These devices are usually tested before installation.这些装置通常在安装前进行试验。3.The workers were discussing the problems before the fire.（当时）工人们正在炉前讨论问题。4.The problem came before the Committee.该问题提到委员会上来了。（原文直译是：该问题摆在委员会面前了。）Ⅱ.before作连接词用，引出一时间从句，表示时间“在……以前”之意：1.The direction of an electric current was decided before electrons were discovered.电流方向是在发现电子前就确定了的。2.We shall discuss the problem fully before we make the decision.在我们作出决定以前，我们将把这个问题充分讨论。注：由before引导的时间从句不用将来时态。上句谓语真实时间取决于主句的谓语时间，即“作出决定”显然是在“讨论”之后，故是将来时间。3.We had read the operation instructions before we began to test machine.开始试验该机器以前，我们已看了操作说明书。上句中主句用过去完成时是因为它的谓语动作是在时间状语从句内过去时谓语began所表示的动作之前发生的，构成了“过去的过去”，故用过去完成时。但考虑到before本身词义已把主句和从句的谓语动词动作先后分清了，有时可以用过去时代替过去完成时。例如：4.I left before he arrived.他还没有到达，我就离开了。Ⅲ.由before引出一种特殊的“定语从句”：1.It happened in the year before the city was liberated.这是在这一城市解放前一年发生的。2.They did not reach Tianjin until May 2, the day before the meeting was to be held.他们到5月2日，也即会议召开前一天到达天津。Ⅳ.before的转用法：在本情况下主句、从句各有情态动词must，can等。翻译时将原文主句译成条件从句，前加“只有”，而从句译成主句。例如：1.We must study hard before we can effectively serve the people.只有（我们）努力学习，我们才能有效地为人民服务。2.A great effort must still be made before the ideals can be turned into reality.只有经过巨大努力，理想才能变为现实。Ⅴ.before作副词用，表示时间上的“以前”、“从前”之意，与其搭配的动词或动作的相应形式（见例句3）多半完成式：1.He has heard this before.他从前听说过这件事。2.We have never studied English before.我们过去从未学过英语。3.I remember having seen such a device before.我记得以前看到过这样一种装置。4.I never met him before.（若用现在完成时也可）我从未见过他。二、几个意义上不要混淆的问题Ⅰ.before和ago用法差异before和ago译成汉语，都是“以前”，但含义差别不大。ago用于从当前说话或写文章时刻算起的若干时间“以前”，动词用过去时。例如：They began the experiment two days ago.两天前他们开始做这个实验。（指说这句话时的两天前。）before用于从过去某时刻算起的若干时间“以前”，动词一般用过去完成式。例如：At that time he said that he had agreed to this proposal two days before.那时他说，他两天前就赞同这个建议。（以“那时”为基准，指“那时”的两天前，当然不可能是听到这句话时的两天前了。）Ⅱ.before long 和long before含义不同：before long作“不久以后”讲，切不要按字面译为“长时间以前”或“好久以前”。1.We hope to finish our experiment before long.我们希望不久（以后）就把实验做完。2.Before long, his work began to show results.不久他的工作开始见效。long before作“很久以前”讲。原意为“……以前很久”，故也可译为“早就”。long before不同，前者在其后面可以接名词或一个从句；当上下文明确时，名词或从句还可以省略。before long则没有上述搭配用法。例如：1.Maxism was widespread in China long before (the)liberation.解放前，马克思主义早就在中国广泛传播了。2.We(had)heard about this new-type machine long before we saw it.这台新型机器我们在见到它以前，早就听说了。3.We see a train approaching long before we hear its sound.在听到火车声以前，我们早就看见火车行驶过来。4.It will not be long we finish the experiment.我们不久就可以完成那个实验。（原意为：在我们完成那个实验以前，时间不会很长了。）5.It was long before he came.他过了很久以后才来。（注意本句的引申译法。）6.We began the test yesterday, but we had made preparations long before.（句末结合上文省略了that或we began the test.）我们昨天开始作实验，但我们在那以前很久就已经作准备了。

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 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。 dont 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“在……之后才……”。例如： it will be five years before i come back. 我五年后才能回来。