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语法考点各个掌握
before
1.引导时间状语从句，“在……之前”，常见于“It will be...(long)before....‖句型。如：It was evening before we reached the little town of Winchester.
It will not be long before we know the result of the experiment.
2.用于祈使句中，既表时间，又表隐含条件，可译作“要不然、否则”，近似or。如：Get out before it got worse.
Put back the book where it is before it gets torn.
3.从属连词，“宁愿……与其……”用法近似于would rather...than...如：He will die before he tells the secret.
4.从属连词，有“不知不觉某事已经完成”的意思，常见于“...before I know it”。如：We had come to the store before we know it.
5.副词，“从前，以前”，常与完成时连用。如：They have known each other long before.
【考例1】The field research will take Joan and Paul about five months; it will be a long
time____we meet them again.
A. after B. before C. since D. when (B)
【考例2】He was told that it would be at least three more months_____he could recover and return to work.(07福建卷，29)
A. when B. before C. since D. that (B)
【考例3】 I’m sorry you’ve been waiting so long, but it’ll still be some time ____ Brian get back.(08北京卷，34)
A. before B. since C. till D. after (A)
2013高考英语试题分类小结篇：动词的时态和语态
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