before的用法归纳

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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。

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。

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

如果主句中用否定式,则表示“不多久……就”。

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

3. 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。

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”。例如:

(1)表示时间,与after相对。如:

August comes before September. 8月份在9月份之前。

There is nothing that has not been bitter before being ripe. 凡事在成熟前,都是有苦味的。

(2)表示顺序,与after 相对。如:

Ladies before gentlemen.女士优先。

(3)表示位置,与behind相对(相当于in front of)。如:

Before Lucy is Lily. 莉莉在露茜的前面。

Don’t put the cart before the horse. 不要本末倒置。

(4)表示“在……面前;与……面对面”。如:

The poor little boy was brought before the headmaster. 那个可怜的小男孩被带到校长面前。

He was brought before the judge. 他被带到法官面前。

(5)表示“宁可……而不愿……”。如:

Death before dishonour. 宁死不辱。

三、before用作副词

(1)before用作副词时,意思是“at an earlier time / in the past以前”。表示“以

前;已经”,单独在句中作状语,句子常用完成时态。如:

I have seen that film before.我以前看过那部电影。

I’ve seen the film Titanic before. 我以前看过《泰坦尼克》这部电影。

I have never seen such beautiful flowers before. 我以前从未见过如此美丽的鲜花。

注意:①区别于ago: ago用在时间段之后,表示某个时间点,句子用一般过去时。如:

I saw that film three years ago.我三年前看了那部电影。

②含有ago 时间状语的直接引语变间接引语时,ago 应变为before。如:

He said to me, “I saw that film three years ago.”

→He told me that he had seen that film three years before.

(2)指空间或位置,表示“在前面”。如:

Look at the page before.看前面一页。

四、

4. 几个需要注意的地方

(1)ever before,单独用作状语,表示“以前”;ever since, 单独用作状语,表示“自从那时以来”;ever after, 单独用作状语,表示“以后;后来”。

(2)before long,单独用作状语,表示“不久以后”,其中long 为名词,后面不接任何成分;可以用于各种时态。例如:

Before long, he went to America. 不久,他就去了美国。

I hope to see you before long. 我希望不久后再见到你。

long before:①单独用作状语,表示“很久以前”,其中before为副词,其后不接任何成分;一般用在过去时或过去完成时的句子里。②表示“在……之前很久”,其中before用作介词或连词,后可接名词、动名词、代词或从句。She said she had read the novel long before. 她说她很久以前就读过这部小说。That happened long before. 那件事发生在很久以前。

(3)when/ while/ if/ unless/ once/ even though 等引导从句时,如果从句主语

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