before句型辨析与解析

2022-08-03 12:08:12   文档大全网     [ 字体: ] [ 阅读: ]

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辨析,句型,解析,before
考点:before用法

一、句型“It + will be + 时间段 + before...”,表示要过多久才…”

“It + may be + 时间段 + before...”,表示也许要过多久才……”

其否定形式“It will/would not be +时间段+ before…”表示过不了多久就……” 二、表示……之前就……”。主句与before从句中的两个动作按时间先后依次发生。 三、表示……”等到……”,或 没等………… ”等。 四、和其它相似句型的区别

“It be +时间段 + 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 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。主句谓语动词可以是一般过去时,也可以是一般将来时。 五、before longlong before的区别

before long意为不久,很快(其中before是介词,long是名词)常在句中作状语,多与动词的过去时或将来时连用。例如: The work will be finished before long. Before long he had to move on again.

long before意为很久以前(其中long是副词。long before单独使用时,before介词;long before后接从句时,before是连词。)这个词组常与过去时或过去完成时连用,跟从句时也可用在一般现在时的句子中。例如: She said that she had heard of it long before. It will be long before he arrives. 【典型考例】

1The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.2007安徽卷) A. after B. before C. since D. when

2How long do you think it will be ______China sends a manned spaceship to the moon? 2006福建卷)


Perhaps two or three years.

A. when B. until C. that D. before

(3It ________ long before we _____the result of the experiment.( 上海春招2002) A. will not be...will know B. is...will know C. will not be...know D. is...know

(4) Scientists say it may be five or six years_________ it is possible to test this medicine on human patients. 2004福建)

A. since B. after C. before D. when

(5)It was some time ___________we realized the truth. 2005山东) A. when B. until C. since D. before

(6)The American Civil War lasted four years ___the North won in the end.(2005广) A. after B. before C. when D. then (7) Why didn't you tell him about the meeting? ( 2006四川卷) He rushed out of the room _________ I could say a word. A. before B. until C. when D. after

(8) It was evening______ we reached the little town of Winchester. 2004天津)

A. that B. until C. since D. before

(9) He made a mistake, but then he corrected the situation _____ it got worse.2003北京) A. until B. when C. before D. as

(10 It is almost five years_____we saw each other last time. 2005北京春) A. before B. since C. after D. when

(11 Did Jack come back early last night? 2005福建)

Yes. It was not yet eight o’ clock________ he arrived hom

A. before B. when C. that D. until

(12You cant borrow books from the school library_____you get your students card. (2009上海) A.before B.it C.while D.as

(13)Im sorry youve been waiting so long, but itll be some time _____Brian gets back. (2008北京) A.before B.since C.till D.after


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