(完整版)before句型辨析与解析
before用法

before⽤法before的⽤法before的⽤法1 作介词A.指时间.在……以前. e.g. It began to rain before midnight .B. 指位置.在……⾯前. e.g. They knelt before the king .C. 指顺序或排列在前⾯. e.g. You name comes before mine on the list .2 作连词A.在……之前. e.g. Did she leave a message before she went ?B.⽤于It + be +时间段+ before :在……之后才……e.g. It willl be five years before I come back .3 常于情态动词can / could 连⽤:还没来得及……就……e.g. Before I could say a word , she had rushed out of the room掌握before热点⽤法1. prep. 在......以前,强调时间He came to see me the day before yesterday. 他前天来看我了。
2. prep. 在......前⾯,当着......的⾯,向......,强调地点She has to appear before the court. 她必须出庭受审。
3. prep. 在......之前,先于,强调次序Those with babies can get on the bus before others. 带⼩孩的⼈可以先上汽车。
4. prep. 与其......(宁愿)I'd shoot myself before I apologized to him! 我宁死也不向他道歉!5. adv. 以前,强调时间We've seen that film before. 我们以前看过那场电影。
before的用法及句型

before的用法及句型一、`before`的基本用法和意义在英语中,副词`before`是一个常见且重要的词汇。
它可以用作介词或连词,在句子中具有多种用途和含义。
下面将详细介绍‘before'的用法及句型。
**1. 表示时间的“之前”**首先,我们经常使用`before`来表示某个事件发生之前的时间。
例如:- I woke up at 7 a.m., but the sun had risen before that.(我早上7点醒来,但太阳在那之前已经升起了。
)- Please submit your assignment before Friday.(请在周五之前提交你的作业。
)这些句子中的"before"表达了某个特定时间或事件在另一个特定时间或事件之前发生。
**2. 表示顺序或优先级**其次,'before'也可以表示顺序或优先级。
这意味着某物在其他事物之前发生或完成。
例如:- Finish your meal before you go out to play with your friends.(吃完饭后再和朋友出去玩。
)- We need to clean the house before we invite guests over.(我们需要在邀请客人过来前打扫房间。
)这些例子表明完成第二件事情之前必须完成第一件事情。
**3. 表示限制条件**此外,'before'也可以表示限制条件,用于说明某个动作或情况发生的前提。
例如:- You can watch TV before you finish your homework.(在你完成家庭作业之前可以看电视。
)- They won't start the meeting before all the participants have arrived.(所有的参会人员到场之前,他们不会开始开会。
高中英语before 考法

before
• before常用于以下句型 • It will be/do +时间段 +before +句子(一般现在
时):要过多久...才... • It will be three days before they arrive. • It was +时间段+before+句子(一般过去时):
• It is/has been +一段时间+since +句子(一 般过去时)“自从...到现在有多长时间了”
• 自从我大学毕业到现在已有7年了。
• It is / has been 7 years since I graduated from college.
• I. It was a long time ______ I realized only by trusting each other can we keep a good relationship with others.
• 2. It will take several years ______ most homes use this new technology.
多久之后...就... • It was just 2 days before the book was
publiched.
翻译一下
• 1.再过一年,我们才毕业。 • It will be one year before we graduate. • 2.没过多久,我们就知道成绩了。 • It wasn’t long before we knew th
before的用法归纳总结

before的用法归纳总结“before”在英语中是一个常用的介词和连词,表示时间或顺序上的“在……之前”或“先于”。
以下是“before”的用法归纳总结:作为介词表示时间:用于表示某个事件或动作发生在另一个事件或动作之前。
复制代码She left the office before noon.(她中午之前离开了办公室。
)表示位置:用于表示某个物体或人位于另一个物体或人之前。
复制代码The car in front of me stopped suddenly.(我前面的车突然停了下来。
)与比较级连用:用于表示“在……之前”的比较关系。
复制代码She finished the race before anyone else.(她比其他任何人都先完成了比赛。
)作为连词引导时间状语从句:用于连接两个句子,表示一个事件在另一个事件之前发生。
复制代码We'll go for a walk before dinner.(我们将在晚饭前散步。
)引导条件状语从句:用于表示某个条件必须满足,之后才能发生另一个事件。
复制代码Before you leave, make sure all the lights are off.(你离开之前,确保所有的灯都关了。
)引导让步状语从句:用于表示尽管某个条件存在,但结果仍然如此。
复制代码Before I met her, I had never believed in love at first sight.(在我遇到她之前,我从不相信一见钟情。
)与其他词连用“before long”:表示不久之后,通常用于肯定句中。
复制代码Before long, she will be recovered from the illness.(不久之后,她就会从疾病中恢复过来。
)“ever before”:表示“以前从未”。
复制代码I have never seen such a beautiful sunset before.(我以前从未见过如此美丽的日落。
(完整版)before句型辨析与解析

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“或许要过多久才”。
其否认形式“It will/would not be + 时间段 + before ”表示“过不了多久就”。
二、表示“在从前就”。
主句与 before从句中的两个动作准时间先后挨次发生。
三、表示“趁”,“等到”,或“没等就”等。
四、和其余相像句型的差别“ Itbe + 时间段 + since 指引的时间状语从句”表示“自从已经有多长时间了”。
主句用一般此刻时或此刻达成时。
“ It be +时间点 +when 指引的时间状语从句”表示“某个动作发生时,是某个时间”。
主句谓语动词能够是一般过去时,也能够是一般未来时。
五、 before long和long before的差别before long 意为“不久,很快”(此中 before 是介词, long 是名词),常在句中作状语,多与动词的过去时或未来时连用。
比如:The work will be finished before long.Before long he had to move on again.long before意为“好久从前”(此中long是副词。
long before独自使用时,before 是介词; long before 后接从句时, before 是连词。
)这个词组常与过去时或过去达成时连用,随从句时也可用在一般此刻时的句子中。
比如:She said that she had heard of it long before.It will be long before he arrives.【典型考例】(1)The field research will take Joan and Paul about five months; it will be a longtime _____ we meet them again.(2007安徽卷)A.after B. before C. since D. when(2)—How long do you think it will be ______China sends a manned spaceshipto the moon?(2006福建卷)—Perhaps two or three years.A. whenB. untilC. thatD. before(3)It ________ long before we _____the result of the experiment.(上海春招2002)A. will not be...will knowB. is...will knowC. will not be...knowD. is...know(4) Scientists say it may be five or six years_________ it is possible to test thismedicine on human patients.(2004福建)A. sinceB. afterC. beforeD. when(5)It was some time ___________we realized the truth.(2005山东)A. whenB. untilC. sinceD. before(6)The American Civil War lasted four years ___the North won in the end.(2005广东) 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. beforeB. untilC. whenD. after(8) It was evening______ we reached the little town of Winchester.(2004天津)A. thatB. untilC. sinceD. 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 homA. beforeB. whenC. thatD. until(12) You can ’tborrow books from the school library_____you get your studentscard. (2009上海)(13)I ’m sorry you’ve been waiting so long, but it’ll be some time _____Brian getsback. (2008北京)。
when,since,before,that句型

It+be+……+that/since/before/when用法辨析1.it was+ (时刻,或时间点)+ when sth. happened。
当某事发生时,是几点钟或哪一年如:It was 1997 when Hongkong returned to China。
It was five o’clock when we arrived at the small mountain village。
对比强调句型:It was at five o’clock that we arrived at the small mountain village。
It+ is/ was+…+that…多用于强调。
判断方法如下:去掉it、be和that,余下的部分仍是一个完整的句子,这样的句子一定是强调句。
2.it was+一段时间+ before sth happened。
过了一段时间之后,某事才发生了.如:it was two years before Macao returned to China.it will be +一段时间before sth。
happens.要过一段时间之后,某事才会发生。
或不用过多久,某些就将发生:it won't be long before sth。
happens。
It won’t be long before you see him again。
没过多久就…It was long before they escaped from the prison。
过了很久才….3。
it is (=has been)+一段时间since sth。
happened。
自某事发生以来,(时间)已经过去.。
了。
如:It is 11 years since Hongkong returned to China.香港回归已经有11年了。
若从句中的动词是终止性动词,意为:“从开始……多久了”例如:It has been five years since she left home.(她离家已经十五年了)It was four years since he had died.(到当时为止,他已死去四年了)若从句中的动词是延续性动词,意为:“不做某事已有多久了”例如:It is two days since she was ill.(她病好了两天)It is two years since he studied English。
“before”的用法及练习

“before”的用法及练习高三课本第十五单元,INTER GATING SKILLS 和 WORKBOOK READING部分有如下的句子:⒈The shop was successful,but it was about sixty years before people started to buy jeans for fashion as well as for work.⒉However,it probably will not be long before the other mountainous areas of China such as Sichuan,Xinjiang and Yunnan are developed,and as more facilities become available,prices will almost certainly fall.其中涉及到before的用法,下面就其用法进行总结。
一、可以用作介词⒈)指时间上早于,在……之前,如:She has lived here since before the war.她从战前就一直在这儿住。
⒉)指位置在前面,如:We knelt down before Grandma‘s grave.我们在奶奶的墓前跪下。
⒊)指顺序或排列在之前,如:Your name comes before mine on the list.名单上你的名字在我之前。
⒋)在某人面前,如:She said it before the witness.他是当着证人的面说的。
二、作为连词其基本含义是“在……之前”,又可以根据不同语境灵活翻译成“才”、“还没来得及就……”、“趁……”、“就”等。
具体用法如下:⒈)与情态动词can/could连用这时候从句虽为肯定形式,根据汉语表达习惯译成“还没来得及就”,如:Before I could get in a word,he had measured me.我还没来得及插话他就为我量好了尺寸。
初三英语中考语法详解(26)later 与 after,ago 与 before用法词义辨析

初三英语中考语法考点重难点详解(26)later 与after,ago 与before用法词义辨析因为词义相近,很多人分不清later 与 after,ago 与 before,要搞清楚他们的区别,关键得看用法。
1. later 与 after 最大的区别应该是:after 可以做连词,引导时间状语从句,而 later 只是个副词。
(1)时间段 + later:常用于过去,表示“稍后、......之后”A few minutes later, the the boss came in with my bag.几分钟之后,老板拿着我的包进来了。
later 也可以单独用,表示“从现在开始的以后”I will tell you later. 我以后会告诉你的。
表达一段时间之后表达一段时间之后,如果用在一般过去时,可以用:时间段+later,也可以用:after+时间段,例如:Two hours later, Jcak came back with an axe. 两小时之后,杰克拿着一把斧头回来了。
After two weeks later, they were both arrested. 两周之后,两个人都背逮捕了。
如果用在一般将来时,用in+时间段,例如:I will go to London in two weeks. 我两周之后去伦敦。
(2)after+时间点、时间段都可以, 多用于过去After 2 o'clock, they started to climb.两点过后,他们开始攀登。
After so many years in the US, he has changed a lot.在美国生活多年之后,他变了很多。
You mustn't come home after 10:30.你不准十点半之后才回家。
表示某时间点之后表示某时间点之后用:after+时间点after ten o'clock:十点之后after April 23rd:4月23号之后(3)after 可以引导从句,later 不能。
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before句型辨析与解析
It + will be + 时间段+ before等表示“在……之后……才”的句型总结
一、用于句型“It + will be + 时间段+ before...”句型中,表示“要过多久才…”,也可用于“It + may be + 时间段+ before...”,表示“也许要过多久才……”。
Before 后的句子中用一般现在时态。
其否定形式“It will/would not be +时间段+ before…”表示“不久就……,过不了多久就……”。
(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
(2)—How long do you think it will be ______China sends a manned spaceship to the moon?
—Perhaps two or three years.
A. when
B. until
C. that
D. before
(3)It ________ long before we _______ the result of the experiment.
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.
A. since
B. after
C. before
D. when
解析:答案为BDCC。
考题
句型中,表示“要过多久…才…”。
(1)(2)before 用于肯定的“It + will be + 时间段+ before...”
(3)before在本题中用于否定句,意为“过不了多久就会……”, 状语从句要用一般现在时代替一般将来时,
可知C项为正确答案,句意是:要不了多久我们就会知道试验的结果了。
,表示“也许要过多久才……”,故选择答案C。
(4)宾语从句中含有句型“It + may be + 时间段+ before...”
二、用于句型“it was +时间段+ before …” 表示“过了(多长时间)才……”。
其否定形式“ it was not +
没过(多长时间)就……”。
时间段+ before …” 意为“不久就……”, “
It was some time ___________we realized the truth.
A. when
B. until
C. since
D. before
表示“过了(多长时间)才……”。
该题题解析:答案为D。
before用于句型“it was +时间段+ before …”
意是“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。
表示“在……之后……才”。
副词“才”在汉语中强调某事发生得晚或慢。
如果在含有before从句的复合句中,强调从句动作发生得晚或慢时,就可以应用这种译法。
The American Civil War lasted four years _______ the North won in the end.
A. after
B. before
C. when
D. then
解析:答案为B。
本题考查连词before表示“在……之后才……”之的用法,根据本句含义“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。
三、表示“……还没来得及……就……”。
目的在于强调从句动作发生之前,主句动作已发生。
—Why didn't you tell him about the meeting?
— He rushed out of the room _________ I could say a word.
A. before
B. until
C. when
D. after
解析:答案为A。
本题考查连词before表示“……还没来得及……就……”的用法。
句意是“我还没来得及说
一句话,他就冲出了房间”。
四、表示“在……之前就……”。
这时主句与before从句中的两个动作按时间先后依次发生。
It was evening______ we reached the little town of Winchester.
A. that
B. until
C. since
D. before
解析:答案为D。
本题考查连词before表示“在……之前就……”的用法。
句意是“我们到达小镇Winchester 之前就已经是傍晚时分了”。
五、表示“趁……”,“等到……”,或“没等……就……”等。
He made a mistake, but then he corrected the situation _____ it got worse.
A. until
B. when
C. before
D. as
解析:答案为C。
由made a mistake和转折词but可知本题句意是“他出了差错, 但没等其进一步恶化,他就调整了局势”。
故正确答案为C项。
六、和hardly,scarcely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,例如:
I had hardly sat down before the telephone rang.=Hardly had I sat down before the telephone rang.
我刚一坐下电话就响了。
We had scarcely reached the school before it began to rain.= Scarcely had we reached the school before it began to rain我们刚到学校天就下雨了。
七、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。
“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。
(1)It is almost five years ________we saw each other last time.
A. before
B. since
C. after
D. when
(2)— Did Jack come back early last night?
— Yes. It was not yet eigh t o’ clock________ he arrived home.
A. before
B. when
C. that
D. until
解析:答案为BB。
考题(1)考查的是“It be +时间段+ since引导的时间状语从句”结构,句意是“自从上次我们见面以来已经近五年没有见了”,故选择答案B。
考题(2)考查的是句型“It be +时间点+when引导的时间状语从句”,句意是“他昨晚回家时还不到8点”,故选择答案B。
八、before long和long 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. 工作不久就会完成。
Before long he had to move on again. 不久,他被迫再次迁移。
long before意为“很久以前”(其中long是副词。
long before单独使用时,before是介词;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. 她说她早就听说过此事。
It will be long before he arrives. 还要等很久他才能到达。