before
[ADV, CONJ, PREP]
1. （某时、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.
双语例句
例：The war had ended only a month or so before.
战争大约在一个月前才结束。
2. 以前（做过某事）
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.
双语例句
例：I've been here before.
我以前来过这儿。
例：I had met Professor Lown before.
我以前见过劳恩教授。
ADV. 副词
1. 在（某日、某时、某事件）以前
If something happens before a second thing happens, it happens earlier than the second event.
双语例句
例：Stock prices have climbed close to the peak they'd registered before the stock market crashed in 1987.
股票价格已经快爬升到了1987年股市崩溃前的最高纪录。
2. 在（做某事）之前
If you do one thing before doing something else, you do it earlier than the other thing.
双语例句
例：He took a cold shower and then towelled off before he put on fresh clothes.
他穿上干净衣服之前，冲了个冷水澡，再擦干身子。
3. （某时、某事）以前
You use before when talking about an earlier time.
双语例句
例：Kelman had a book published in the US more than a decade before a British publisher would touch him.
科尔曼在美国出版了一本书后的十多年，英国的出版商才愿意出版他的作品。
4. 在（某人能做某事）之前
If you do something before someone else can do something, you do it when they have not yet done it.
双语例句
例：Before Gallacher could catch up with the ball, Nadlovu had beaten him to it.
在加拉赫能接住球之前，纳德洛夫就已经比他先接到了。
5. 经过（一段时间或努力）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.
近义词
双语例句
例：It was some time before the door opened in response to his ring.
他按过门铃后好一会儿门才打开。
6. 在（某事发生）之前（另一情况必须发生）
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.
双语例句
例：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些事情要做。
CONJ. 连词
1. 在（某日、某时、某事件）以前
If something happens before a particular date, time, or event, it happens earlier than that date, time, or event.
双语例句
例：Annie was born a few weeks before Christmas.
安妮在圣诞节前几个礼拜出生。
例：Before World War II, women were not recruited as intelligence officers.
二战前，不征募女性情报官。
2. 在（做某事）之前
If you do one thing before doing something else, you do it earlier than the other thing.
双语例句
例：He spent his early life in Sri Lanka before moving to Canada.
移居加拿大前，他早年生活在斯里兰卡。
3. （某时、某事）以前
You use before when you are talking about an earlier time.
双语例句
例：It's interesting that he sent me the book twenty days before the deadline for my book.
有趣的是，他在我的书到期前20天把那本书寄给了我。
4. 在（某物）前面
If someone is before something, they are in front of it.
双语例句
例：They drove through a tall iron gate and stopped before a large white villa.
他们开车穿过一扇高高的铁门，然后停在了一幢白色大别墅前。
5. 在（某地）前方（某距离处）
If you tell someone that one place is a certain distance before another, you mean that they will come to the first place first.
双语例句
例：The station is on the right, one mile before central Romney.
车站在右侧，罗姆尼市中心前方一英里处。
6. 在（人或组织）面前（回答提问）
If you appear or come before an official person or group, you go there and answer questions.
双语例句
例：The governor will appear before the committee next Tuesday.
这名行政官员将于下周二面对该委员会回答提问。
7. （发生）在（某人、某组织）面前
If something happens before a particular person or group, it is seen by or happens while this person or this group is present.
双语例句
例：The game followed a colourful opening ceremony before a crowd of seventy-four thousand.
紧随一场精彩的开幕式，该比赛在7.4万名观众面前拉开了帷幕。
8. （必须经历的事情）在（某人）面前
If you have something such as a trip, a task, or a stage of your life before you, you must do it or live through it in the future.
近义词
ahead of
双语例句
例：Everyone in the room knew it was the single hardest task before them.
屋子里每个人都知道这是摆在他们面前的一项最艰巨的任务。
9. （重要性）以…为先
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.
双语例句
例：Her husband and her children came before her needs.
她以丈夫和孩子们的需要为先。
PREP. 介词
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