before

英[bi'fɔ:]美[bi'fɔ:]

prep.
1.(表示位置)在…前面
2.(表示时间)先于，在…以前
3.(表示比较)优于，先于
4.(表示顺序)在…之前，（次序或排列）在前面
5.(表示目的)供…研究，由…审判
6.表示面临或临近
7.当面
8.表示面对某人、某事时的反应
conj.
1.在…之前
2.到…为止，到…之前
3.以免；不然
4.（宁可…而）不愿
ad.
1.先前；从前；以前；过去；已经

同反义词

同：	[r.] ahead, earlier, in front

词义辨析

ago，before

这两个副词均含“……以前”之意。
ago指从现在起往前推算一段时间，始终置于所修饰的词之后，与一般过去时连用。
before或指从过去某一时间起向前推算的若干时间的以前，通常与过去完成时连用；或泛指以前，并不具体指若干时间以前，可使用现在完成的或过去时；还可指从将来某一时间起的若干时间以前。

常用短语

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英英解释

副词解释：

earlier in time; previously
- 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
[同] earlier, before
at or in the front
- 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
[同] in front, ahead, before

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开心词场背单词

before

副词解释：

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