before的意思是：conj.在 ... 以前；pref.在 ... 以前；在..前面；adv.以前；以往；之前。before的例句是用作前缀(pref.)B comes before C in the alphabet.B在字母表里排在C之前。before的词语用法是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。
一、详尽释义点此查看before的详细内容
二、双解释义
三、英英释义
"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"
"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"
四、例句
B comes before C in the alphabet.
B在字母表里排在C之前。
He made a statement before the House of Commons.
他在下议院当众发表了一个声明。
He always put the interests of others before his own.
他总把他人的利益放在第一位。
I'd met him once before.
我曾经见过他。
I have seen that film before.
那部电影我以前看过。
I was inspired to work harder than ever before.
我受激励比以往任何时候都更加努力地工作。
He used to get some shut-eye before the game.
他以往常常在比赛前睡一会儿。
He overlooked the contract before he signed it.
他在签字之前仔细阅读了合同。
I'll try to rush the book through before Saturday.
我会设法在星期六之前把这本书赶紧看完。
五、常用短语
六、词汇搭配
七、常见错误
误 The students went out before the bell didn't ring.
正 The students went out before the bell rang.
before引导的时间状语从句不能用于否定句。before的相关近义词
before的相关反义词
before的相关临近词
beforehand、befit、beforeness、beforetime、before now、before all、before tax、before day、before skip、before this、before noon、before hand