before的用法：before可作介詞，含義為“之前”、“在…面前”、“在前面”；before還可作連詞，含義為“到…為止”、“到…之前”、“不然”、“不愿”；before也可作副詞，含義為“過去”、“已經(jīng)”。
before的中文含義及用法介紹
before可作介詞、連詞和副詞，譯為之前;在…以前;在…面前(或前面);在…以前;到…為止;到…之前;以免;以前;過去;已經(jīng)。例句有：
1、She's lived there since before the war.
她從戰(zhàn)前起就一直住在那里。
2、Before you is a list of the points we have to discuss.
放在你面前的是一份我們要討論的要點清單。
3、Your name is before mine on the list.
名單上你的名字在我之前。
4、The task before us is a daunting one.
我們面臨的任務令人膽怯。
5、They had the advantage of playing before their home crowd.
他們有在主場觀眾面前比賽的優(yōu)勢。
6、They retreated before the enemy.
面對敵人，他們撤退了。
7、Did she leave a message before she went?
她走之前留言了嗎？
8、It was some time before I realized the truth.
過了很長一段時間我才悟出真相。
9、It had been fine the week before.
前一個星期天氣很好。
10、I think we've met before.
我覺得我們以前見過面。
