before

英 [bɪˈfɔ:(r)]

美 [bɪˈfɔr,-ˈfor]

基本含义：

conj.在 ... 以前

pref.在 ... 以前；在..前面

adv.以前；以往；之前

详情解释：

conj.(连词)

• 在...以前
• 与其...宁可

adv.(副词)

• 在前，向前
• 较早
• 以前，以往，已经

n.(名词)

• 以前的事情

prep.(介词)

• （指时间）在...以前
• （指位置）在...前面，面对着
• （指次序、重要性等）在...之前，先于
• （宁可...而）不愿...
• 由...考虑中
• 等待着...，有待于...去完成
• 在未扣除…之前

prep.(介词)

• (表示位置)在…前面 in front of
• (表示时间)先于,在…以前 earlier than; preceding in time
• (表示顺序)在…之前 at an earlier point in an order than; ahead of
• (表示比较)优于,先于 occupying a superior place in order of precedence or importance
• (表示选择)与其…宁可 in preference (to), rather than

conj.(连词)

• 在…之前 earlier than the time

adv.(副词)

• 先前; 从前; 以前 at an earlier time; already; formerly
• 在前，在前面 in the front
• 到前面 forward

adv

1. earlier in time
previously

e.g. I had known her before
as I said before
he called me the day before but your call had come even earlier
her parents had died four years earlier
I mentioned that problem earlier

Synonym: earlier

2. at or in the front

e.g. I see the lights of a town ahead
the road ahead is foggy
staring straight ahead
we couldn't see over the heads of the people in front
with the cross of Jesus marching on before

Synonym: aheadin front

In addition to the uses shown below, before is used in the phrasal verbs ‘go before’ and ‘lay before’.
除下列用法外，before 还可用于 go before 和 lay before 等短语动词中。

1. （时间上）在…之前，早于
If something happens before a particular date, time, or event, it happens earlier than that date, time, or event.

e.g. Annie was born a few weeks before Christmas...
安妮出生在圣诞节前几周。
e.g. Before World War II, women were not recruited as intelligence officers...
在第二次世界大战之前，女性不能当情报人员。

2. 在（做某事）之前
If you do one thing before doing something else, you do it earlier than the other thing.

before的解释

e.g. He spent his early life in Sri Lanka before moving to England...
在移居英格兰之前，他早年是在斯里兰卡度过的。
e.g. Before leaving, he went into his office to fill in the daily time sheet.
离开前，他到自己的办公室填写了日常考勤表。

3. 在（某时间或某事）以前
You use before when you are talking about time. For example, if something happened the day before a particular date or event, it happened during the previous day.

before

e.g. The war had ended only a month or so before.
战争大约一个月前才刚刚结束。

4. 在（他人做某事）之前
If you do something before someone else can do something, you do it when they have not yet done it.

e.g. Before Gallacher could catch up with the ball, Nadlovu had beaten him to it.
加拉赫还没来得及追上球，纳德洛武就已经抢先一步触到球了。

5. 以前；以往；过去
If someone has done something before, they have done it on a previous occasion. If someone has not done something before, they have never done it.

e.g. I've been here before...
我以前来过这儿。
e.g. I had met Professor Lown before...
我以前见过劳恩教授。

6. （直到…）才；（过了…）才
If there is a period of time or if several things are done before something happens, it takes that amount of time or effort for this thing to happen.

e.g. It was some time before the door opened in response to his ring.
他按完门铃后过了一会儿门才打开。

7. （必须先具备某一条件）才能；在…之前（必须具备某一条件）
If a particular situation has to happen before something else happens, this situation must happen or exist in order for the other thing to happen.

e.g. There was additional work to be done before all the troops would be ready.
在全军准备就绪之前，还有一些杂事必须处理。

8. （方位）在…前面，在…面前
If someone is before something, they are in front of it.

e.g. They drove through a tall iron gate and stopped before a large white villa.
他们开车穿过一个大铁门，在一栋白色的大别墅前面停了下来。

9. （所经位置）在…前面
If you tell someone that one place is a certain distance before another, you mean that they will come to the first place first.

e.g. The turn is about two kilometres before the roundabout.
拐弯就在环岛前面约2公里处。

10. 面对…（回答质询）
If you appear or come before an official person or group, you go there and answer questions.

before的反义词

e.g. The Governor will appear before the committee next Tuesday.
下周二，州长将接受委员会的质询。

11. 当着…的面；在…注视之下
If something happens before a particular person or group, it is seen by or happens while this person or this group is present.

e.g. The game followed a colourful opening ceremony before a crowd of seventy-four thousand.
绚丽多彩的开幕式过后，这场比赛在74,000名观众的瞩目之下开始了。

12. 摆在…面前；使面对；使面临
If you have something such as a journey, a task, or a stage of your life before you, you must do it or live through it in the future.

e.g. Everyone in the room knew it was the single hardest task before them...
房间里所有人都清楚，摆在他们面前的是最为艰巨的任务。
e.g. I saw before me an idyllic life.
展现在我眼前的是充满诗情画意的生活。

13. （重要性）超过；比…重要
When you want to say that one person or thing is more important than another, you can say that they come before the other person or thing.

e.g. Her husband, her children, and the Church came before her needs.
丈夫、孩子和教会都比她本人的需求重要。

14. before long -> see long

词语用法：

prep.(介词)

• before可用于表示时间。首先，可以表示“先于，在…以前”，其后可以跟表示具体日期、时间等的名词或数词，也可以跟表示时间或动作的名词。其次，可以表示“在做…之前”，后接 v -ing。再次，可以表示“紧接在…之前”。before用于否定句还可表示“直到…为止”。注意before之后只能接表示时间点的名词，而不能接表示时间段的名词。
• before可用于表示动态或静态的位置，意思是“在…之前”，与behind相对。
• before可用于表示顺序或排列上的“在…之前”或“居于…之前”，与after相对。引申可用于表示比较，即在等级、价值、重要性、能力等方面的“在先”“优于”“重于”。再引申则可用于表示对某事物的优先选择，即“宁可”或“与其…宁可”。
• before还可表示“面对，在…眼前，在…面前”“有待于去完成”“在审理中，由…考虑”“在…压力下”等。

conj.(连词)

• before主要引导时间状语从句，意为“先于”“…之后才”“(不多久)就…”。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。before引导的时间状语从句不能用于否定式。
• before还可用于barely〔scarcely〕...before结构，意为“刚…就…”。
• before还可引导让步状语从句，意思是“宁愿…也不…”。
• before引导的从句常用省略句型。

adv.(副词)

• before用作副词时,意思是“以前,在前面”,表示从较近的过去至较远的过去。用作时间状语泛指以前、不与具体时间连用时，谓语动词可以用一般过去时,也可用现在完成时,前者只表示“过去发生过”,后者则强调“对现在有影响”。
• before与具体时间连用时,一般置于其后，谓语动词通常用过去完成时。
• before也可表示空间或位置的“在前，在前面”，还可表示运动“到前面”。

相关例句：

He was brought before the judge.(他被带上法庭。)

You must get home before curfew.(你必须在实行宵禁以前回到家中。)

She paused significantly before she answered.(她在回答之前意味深长地停顿了一下。)

I had met Professor Lown before.(我以前见过劳恩教授。)

We should arrive before dark.(我们天黑以前应该能赶到。)

They retreated before the enemy.(面对敌人，他们撤退了。)

The animals are stunned before slaughter.(屠宰前要先把动物击昏。)

They'll be back well before dark.(他们会在天黑以前回来。)

The rain began before sunrise.(雨是在日出前开始下的。)

She said it before witnesses.(她当着证人的面讲出这事。)