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1、-before用法归纳-第 5 页 before用法知多少?在高考中,状语从句是每年高考单项填空部分必考的题目之一,考查的重点是考生容易混淆并且近似的连词在逻辑行文和语篇结构中的使用。before作连词的用法一直是高考的重点,也是学生感觉掌握起来比较头疼的地方。下面选取近几年各省市的高考试题进行归纳分析,使考生通过典型实例,把握高考对before所引导的句型的命题规律,帮助同学们更好地解答此类题目。1. before作为连词时的基本意义是“在之前”,用于表示时间或顺序。You cant borrow books from the school library _ you get your st
2、udent card. (2009上海,32)A. before B. if C. while D. as【解析】选A。考查连词,该句的意思是:在你得到你的学生卡之前你不能从学校图书馆借书。before表示先后顺序。2. 表示“过了多久才”,说明主句的持续时间比较长而从句的动作缓缓来迟。(1) The American Civil War lasted four years _ the North won in the end. (2005广东,30)A. after B. before C. when D. then【解析】选B。本题考查连词before表示“在多久之后才”的用法,根据本句含
3、义“美国南北战争持续了四年,北方才最终取得胜利”,可知本题应选B。(2) Several weeks had gone by I realized the painting was missing. (2004宁夏,39) A. as B. before C. since D. when【解析】选B。before表示“过多久才”。句意:几个星期已经过去了,我才意识到油画丢了。内含的意思是油画丢了好几个星期了,我才意识到。3. 表示从句动作还没来得及发生或完成,主句动作就已经发生或完成了,意为“尚未就”,“没来得及就”,常用于before sb. can/ could。Why didnt you
4、 tell him about the meeting? ( 2006四川,35) He rushed out of the room _ I could say a word. A. before B. until C. when D. after 【解析】选A。本题考查连词before表示“还没来得及就”的用法。句意为:我还没来得及说一句话,他就冲出了房间。4. 表示“以免,以防,趁还没有”,强调动作的必要性,以避免或防止从句动作的发生。He made a mistake, but then he corrected the situation _ it got worse.(2003北京
5、)A. until B. when C. before D. as【解析】选C。由made a mistake和转折词but可知本题句意是“他犯了一个错误,但在事情进一步恶化之前他改变了形势。”故答案正确答案为C项。5. 用于 “It will be/would be一段时间before”句型中,表示“还要过多长时间才”;用于“It was一段时间before”句型中,表示“过了多长时间才”,强调时间的“长”。(1) Im sorry youve been waiting so long, but itll still be some time _ Brian get back. (2008北
6、京,34)A. before B. since C. till D. after 【解析】选A。句意:很抱歉你一直在这儿等了很久了,但是还得过一段时间Brian才能回来。It will be +一段时间+before从句表示“还要过多久才”,符合句意。(2)The field research will take Joan and Paul about five months; it will be a long time _ we meet them again. (2007安徽,21) A. after B. before C. since D. when【解析】选B。句意:这个项目的研究
7、要花掉Joan和Paul大约五个月的时间;我们要过很长时间才能再见面。before与一段时间连用且用于肯定句中表示“要过多长时间才”,故选B。(3) He was told that it would be at least three more months _he could recover and return to work. (2007江西,29) A .when B. before C. since D. that【解析】选B。句意:他被告知他至少还需要三个多月才能康复上班。before用于“It would be+一段时间+before”句型中表示“要多多长时间才”。(4) It
8、 was some time _we realized the truth. (2005山东)A. when B. until C. since D. before 【解析】选D。before用于句型“it was +时间段+ before ”中表示 “过了多长时间才”。题意为:过了一段时 间我们才意识到事情的真相。故正确答案为C项。6. 用于句型“It wont be/was not一段时间before”中,意为“不久就”,“没过多长时间就”,强调时间的“短”。John thinks it wont be long he is ready for his new job. (2010陕西,2
9、0) A. when B. after C. before D. since【解析】选C。句意为:约翰认为,用不了多久他就会为他的新工作做好准备。It wont be long before.意思是“用不了多久就会”,符合句意,因此C为正确答案。when引导时间状语从句时意为“当的时候”或“这时”;after表示“以后”;since表示“自从”,后接一个过去的时间或过去的某件事,均不符合题意。7. when和hardly连用,表示“刚一就”。该结构主句常用过去完成时,当hardly位于句首时,要用倒装语序。The girl had hardly rung the bell _ the door
10、 was opened suddenly, and her friend rushed out to greet her. (2010福建,26)A. before B. until C. as D. since【解析】选A。句意:那个女孩刚一按门铃,门就开了,她的朋友冲出来迎接她。before和hardly连用,表示“刚一就”,与语境相符。until“直到”;as“当的时候”;since“自从以来”,均与语境不符。8. before句型和其它相似句型的区别有时候before引导的时间状语从句与since,when引导的时间状语从句在下列结构中较相似,容易混淆。(1) “It be +时间段
11、+ since引导的时间状语从句”表示“自从已经有多长时间了”。主句用一般现在时或现在完成时。It is almost five years we saw each other last time. (2005北京,春招)A. before B. since C. after D. when【解析】选B。考查since的用法。句意为:自从我们最后一次见面已经几乎五年了。It is/ has been +一段时间+since从句意为“自从已经(多久)了”,since从句中谓语动词用过去时态。(2) “It be +时间点 +when引导的时间状语从句”表示“某个动作发生时是某个时间”。主句谓语动
12、词可以是一般过去时,也可以是一般将来时。Because of the heavy traffic, it was already time for lunch break she got to her office. (2010四川,20) A. since B. that C. when D. until【解析】选C。句意:因为交通阻塞,当她到达办公室时已经是午休的时间了。when引导时间状语从句,意为“当的时候”,符合句意,为正确答案。9. before long和long before的区别(1) before long意为“不久,很快”(其中before是介词,long是名词),常在句
13、中作状语,多与动词的过去时或将来时连用。例如:Before long, the news sped to every part of the world. 不久以后,这个消息遍布到了世界上的每一个地方。I am so excited that I will enter a new school before long. 不久我就要进入一所新的学校学习,我感到非常兴奋。(2)long before有两个用法:一为“老早,早就(单独使用,表示比过去某时早得多的时间)”。二表示“在的很久以前,在还没有的很久以前”。如:She had left long before his return/he re
14、turned 在他回来的很久以前她就走了。He had worked in the factory long before he got married. 在他还没有结婚的很久以前他就在这家工厂工作了。注:此时的主句谓语通常用过去完成时,但有时也可用一般过去时(因为 before 已体现了动作的先后关系)。如:This happened long before you were born. 这事在你还没出生以前很久就发生了。趁热打铁:1. Tommy, your mum has been out without glasses ! Well, take it easy. she comes b
15、ack home for them. A. It is long before that B. It wont be long since C. It wont be long before D. It will be long before【解析】选C。考查固定句型。It wont be +时间段+before表示“过不了多久就会”;It will be +时间段+before表示“要过多久才”;由take it easy可知后句意为“过不了多久她就会回来”,故选C。2. How long do you think the computer company brings out a new
16、product ? A. it will be before B. will it be until C. will it be when D. it will be that 【解析】选A。复合疑问句中的do you think后的句子为陈述语序,排除B、C。It will bebefore表示“要过多久才”。句意为:你认为这家电脑公司要过多久才能出新产品?3. Have you any information about Julia? Pity! Its a long time I met her last.A. before B. since C. until D. when【解析】选B
17、。自从我最后一次见她到现在已很久了。由句意以及主从句时态关系可知用since。4. It s quite a timeYao Ming got injured, but it won t be longhe returns to the court. A. since; before B. after; when C. before; since D. that; when【解析】选A。考查since和before的用法。句意为:自从姚明受伤已经有相当一段时间了,但是要不了多久他就会回 归球场的。It is +一段时间+since从句意为“已经(多久)了”;It wont be long be
18、fore +从句意为“过不了(多久)就将”。5. It may take a while _ you find a hobby that truly interests yourself, so dont give up.A. that B. before C. unless D. since【解析】选B。句意:要经过一段时间,你才能找到使你感兴趣的爱好。It be +段时间+before 意为“要过多久才”。6. How long do you suppose it is _he arrived there?A. when B. before C. after D. since.【解析】选D. 你认为他到这有多久了?since “自从”,由它引导的状语从句,主句为一般现在时态时,从句用一般过去时态。