conj. 在 … 以前
pref. 在 … 以前；在..前面
before 义务阶段1500 全国卷频次:219
在…以前；在…前面 & 以前 & 在…之前
Before I knew it an hour had passed and it was time to move on to lunch.
It was only after he had read the papers that Mr. Gross realized the task before him was extremely difficult to complete.
Some time passed before my stepfather and I got used to each other.
We had guests last night who had not stayed in a B&B hotel before.
before and after 前后，之前之后
than before 比以前
as before 如以前
before long 不久以后
ever before 以前；从前
than ever before 比以往任何时候更…
from before 从…以前
go before 居先；走在前面
on or before 截至；在或在…以前
before all 尤其，特别
(指時間)在…以前,在..前面,在..之前They’ve seen that long before.他們早就看過那個了.
1. earlier than sb / sth
the day before yesterday
The year before last he won a gold medal, and the year before that he won a silver.
She’s lived there since before the war.
He arrived before me.
She became a lawyer as her father had before her.
Leave your keys at reception before departure.
Something ought to have been done before now.
We’ll know before long (= soon).
Turn left just before (= before you reach) the bank.
2. (rather formal) used to say that sb / sth is in a position in front of sb / sth
They knelt before the throne.
Before you is a list of the points we have to discuss.
⇨ compare behind prep. (1)
3. used to say that sb / sth is ahead of sb / sth in an order or arrangement
Your name is before mine on the list.
He puts his work before everything (= regards it as more important than anything else).
4. used to say that sth is facing sb in the future
The task before us is a daunting one.
The whole summer lay before me.
5. in the presence of sb who is listening, watching, etc.
He was brought before the judge.
She said it before witnesses.
They had the advantage of playing before their home crowd.
6. (formal) used to say how sb reacts when they have to face sb / sth
They retreated before the enemy.
1. earlier than the time when
Do it before you forget.
Did she leave a message before she went?
It may be many years before the situation improves.
It was some time before I realized the truth.
3. used to warn or threaten sb that sth bad could happen
Put that away before it gets broken.
4. (formal) rather than
I’d die before I apologized!
at an earlier time; in the past; already
You should have told me so before.
It had been fine the week before (= the previous week).
That had happened long before (= a long time earlier).
I think we’ve met before.
1 earlier than a particular event or action 在…以前 OPP after
Say goodbye before you go.
I saw her a few days before she died.
2 so that something does not or cannot happen 在…发生之前，以防
Put that money somewhere safe before it gets stolen.
That dog ought to be destroyed before it attacks any more children.
Before I could say anything more, Holmes had rushed off towards the station.
3 used to say that something happens after a period of time …之后才
It was several minutes before we realised what was happening.
It will be a while before we know the results.
4 used to say that something must happen in order for something else to be possible 在…之前〔必须做某事〕，…之后才能
You have to pass a test before you can get a licence.
5 spoken used to warn someone that something bad will happen to them if they do not do something 要不然，否则〔表示警告〕
Get out before I call the police!
6 used to emphasize that someone does not want to do something 〔宁可…〕也不愿
She would die before she would admit she was wrong.
before2 ●●● S1 W1 preposition
1 earlier than something or someone 〔时间上〕在…以前 OPP after
The new road should be completed before the end of the year.
Let’s meet at our house before the show.
Larry arrived home before me.
five minutes/two hours etc before something
Hugh arrived just five minutes before the ceremony.
before doing something
I usually take a shower before having my breakfast.
We only got back from Scotland the day before yesterday (=two days ago).
Other students joined in the protest, and before long (=soon) there was a crowd of 200 or so.
2 ahead of someone or something else in a list or order 〔名单或次序上〕较…为先，在…之前 OPP after
You were before me in the queue.
The files are in alphabetical order, so B1 comes before C1.
3 used to say that something happens where it can be watched by people 在…面前，当着…的面 SYN in front of
Italy will face Brazil this afternoon before a crowd of 100,000 spectators.
an actor who had performed before the Queen
4 used to say that someone or something comes to be judged or considered by a person or group of people 摆在…面前；供…考虑
5 used to say that one thing or person is considered more important than another 〔重要性〕在…之前，比…更重要
6 formal in front of something or someone 在…前面
7 if one place is before another place on a road or journey, the first place is nearer to you than the second, so you will reach it first 〔路上或旅途中的某个地方〕在〔另一个地方〕前面 OPP after
8 formal if there is a job or situation before you, you will have to do the job or face the situation 〔工作或局面〕摆在…面前 SYN ahead of
9 formal if a period of time is before you, it is about to start and you can do what you want during it 〔指一段时间〕临近 SYN in front of
before3 ●●● S1 W1 adverb
1 at an earlier time 先前，从前，以前
2 the day/week/month etc before the previous day, week, month etc 前一天/一个星期/一个月等 OPP after
3 old use ahead of someone or something else 在前面
Origin before2 Old English beforan, from foran “before”, from fore; → FORE-
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.PREP 介词（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. →see usage note at:ago
Annie was born a few weeks before Christmas…
Before World War II, women were not recruited as intelligence officers…
My husband rarely comes to bed before 2 or 3am.
Before is also a conjunction.
Stock prices climbed close to the peak they’d registered before the stock market crashed.
2.PREP 介词在（做某事）之前 If you do one thing before doing something else, you do it earlier than the other thing.
He spent his early life in Sri Lanka before moving to England…
Before leaving, he went into his office to fill in the daily time sheet.
Before is also a conjunction.
He took a cold shower and then towelled off before he put on fresh clothes.
3.ADV 副词在（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.
【搭配模式】：n PREP n
The war had ended only a month or so before.
Before is also a preposition.
It’s interesting that he sent me the book twenty days before the deadline for my book.
Before is also a conjunction.
Kelman had a book published in the US more than a decade before a British publisher would touch him.
4.CONJ-SUBORD 连词在（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.
Before Gallacher could catch up with the ball, Nadlovu had beaten him to it.
5.ADV 副词以前；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.
【搭配模式】：ADV after v
I’ve been here before…
I had met Professor Lown before…
She had never been to Italy before.
6.CONJ-SUBORD 连词（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.
It was some time before the door opened in response to his ring.
7.CONJ-SUBORD 连词（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.
There was additional work to be done before all the troops would be ready.
8.PREP 介词（方位）在…前面，在…面前 If someone is before something, they are in front of it.
They drove through a tall iron gate and stopped before a large white villa.
9.PREP 介词（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.
The turn is about two kilometres before the roundabout.
10.PREP 介词面对…（回答质询） If you appear or come before an official person or group, you go there and answer questions.
The Governor will appear before the committee next Tuesday.
11.PREP 介词当着…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.
The game followed a colourful opening ceremony before a crowd of seventy-four thousand.
12.PREP 介词摆在…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.
Everyone in the room knew it was the single hardest task before them…
I saw before me an idyllic life.
13.PREP 介词（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.
【搭配模式】：v PREP n
Her husband, her children, and the Church came before her needs.
14. before long→see: long;
: at an earlier time以前；过去
Haven’t we met before?
the night/day before
I’ve never seen her so happy before. [=I’ve never seen her as happy as she is now] 我之前从未见过她如此高兴。
We haven’t had these problems before.
Everything is just as (it was) before.
formal + old-fashioned : to or toward the place where someone is going : in advance向前；在前边
marching on before [=ahead] 向前行进
2 before /bɪˈfoɚ/ preposition
a : at a time preceding (something or someone) : earlier than (something or someone)（时间）在…之前，早于
We arrived shortly before six o’clock.
He left just before sunrise.
I’ve never seen her so happy before now.
Call me before your arrival.
She arrived the day before yesterday.
Why haven’t you ever helped me before now/this?
I finished the exam before him. [=before he finished the exam] 我比他先考完试。
You can go before me. [=before I go] 你可以比我早走。
He’s an electrician, like his father before him. [=his father was also an electrician] 他是电工，他父亲以前也是电工。
They earned 50,000 dollars before (paying) taxes.
b US — used to describe a time earlier than a specified hour在（某个钟点）之前
It’s 20 (minutes) before 12. [=it’s 20 of/to 12; it’s 11:40] 差20分12点。
: preceding (something or someone) in order or in a series（次序）在…之前，先于
Your name is listed before mine.
You’ll see my house just before the bank and after the school.
The number 2 comes before 3 and after 1. [=2 comes between 1 and 3] 数字2在3和1之间。
a : in front of (someone or something)（位置）在…前面，在…面前
The Great Plains stretched endlessly before them.
The championship fight took place before a crowd of thousands.
: in the presence of (someone)当着（某人）的面
The defendant stood up before the judge.
— see also (right) before/in front of your (very) eyes at 1eye
b : being considered by (someone or something)由…考虑中
The case before the court involves a robbery.
the candidates before the voters
I have a proposal to put before [=to] the board.
The question before us is this: did he fall or was he pushed?
c : in the future for (someone) : ahead of (someone)等待着…；面临着…
They had no idea of the ordeal that lay before them.
a : in a higher or more important position than (something)（重要性）优于，在…之前
They put quantity before [=above] quality. [=they cared more about quantity than about quality] 他们重数量轻质量。
b : rather or sooner than（宁可…而）不愿…
He vowed that he would choose death before dishonor. [=he would rather die than be dishonored] 他发誓说宁愿死也不肯蒙羞。
formal : under the force of (something)在…影响下；在…威慑下
The tree fell before the force of the wind. [=the force of the wind caused the tree to fall] 树被大风刮倒了。
3 before /bɪˈfoɚ/ conjunction
a : earlier than the time that : earlier than when（时间）在…之前，早于
He left long before morning came.
The judge stood up before the defendant did. [=the defendant stood up after the judge did] 法官先于被告站了起来。
Say goodbye before you go.
Call me before you arrive.
Before [=until] she met him she had never been so happy.
I finished the exam before he did.
It was/happened not long before he arrived.
He left before I could thank him. [=I wasn’t able to thank him because he left too soon] 我还没来得及谢他，他就走了。
I’ll resign before I give in! [=I would rather resign than give in] 我宁可辞职也不愿屈从。
— see also before you know it at 1know
b : until the time that到…之前；到…为止
It did not take long before he had earned their trust. [=he earned their trust quickly] 他很快就赢得了他们的信任。
“I have promises to keep and miles to go before I sleep…”
Robert Frost, “Stopping by Woods on a Snowy Evening” (1923)罗伯特·弗罗斯特，《雪夜林畔小驻》(1923)
a — used to refer to something that might happen以免；不然
Get out of there before you get dirty! [=get out of there because you will/might get dirty if you don’t] 离开那里，以免弄一身脏！
Before I forget, will you give me your telephone number? [=I’m asking for your telephone number now because I might forget to do it later] 趁我还记得，把你的电话号码给我可以吗？
b — used to say that one thing must happen for another thing to happen or be possible（先…）才…
He must be convicted before he can be removed from office.
You must have completed an introductory class before you can take an advanced class.