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before 句型

before 句型
before 句型

9.before 句型:

(1) It will be +时间+ before + 还有多长时间……

例:It will be 4 years before he graduates. 他还有四年时间就毕业了。

(2) It was +一段时间+ before 过了多久就……

例:It wasn’t two years before he left the country. 还没到两年他们离开了那国家。

(3) before sb can/ could … 某人还没来

得及……

例:Before I could get in a word ,he had measured me.

(4) 过了多久才……

例:We had walked a long way before we found some water.

(5)还有“趁……(还没有)”之意。例如:They are thinking of buying the house before the prices go up.

(6) before long是“很快,不久”的意思, 可以用于各种时态。Before long, he went to America.

(7) long before是“很久以前”的意思

Eg: That happened long before. 那件事发生在很久以前。

They had known each other long before they got married.

10. since 句型:

It is/ has been +时间段+ since…+一般过去时. (到目前为止)干某事有多长时间了

It was + 时间段+ since +过去完成

时(到过去某时间为止)干某事有多长时间了

Sb/ sth.+ 现在完成时+since+ 过去时。。(注意从句的谓语动词是否延续)

Eg: It is about ten days since he came back from abroad.

It was days since I had left there.

比较一下:

He has written to me frequently since I fell ill. 自从我生病以来,他就经常给我写信。

He has written to me frequently since I was ill. 自从我病愈以来,他经常给我写信。

11. when 句型:

It will be +时间+ when +一般现在时当某事发生时,时间将会是。。。

It was +时间+ when+一般过去时当某事发生时,时间是。。

Eg: It will be midnight when they get there .

It was 1949 when new China was founded.

before/ago,since用法

before和ago都能表示在一段时间以前,但是二者的内涵和具体用法有明显的区别: 1. before表示从过去或将来某一时间算起多少时间以前,由于与这一时间状语连用的行为先发生在过去或将来某一时刻之前,因此往往出现在过去完成时态或将来完成时态中。例如: ①I called him up last night,but his mother told me he had left for Wuhan two days before. ②She said that she had married him five years before. 2.如果不具体表明多少时间以前,before意为"从前;以前",表示从现在开始追溯到过去一段时间,或者主句的谓语动词表示的是经常、反复发生的行为,以副词的形式置于句末,可以用在现在完成时态中。例如: ①I have never been to Beijing before. ②Have you ever seen a tiger before? ③I often go over the lessons that I have learned a few days before. 注意:before前的时间状语如果是特定的,含义不一样。试比较: He said he had arrived here a day before. (一天前) He said he had arrived here the day before. (前一天) 3. ago指的是从现在起到过去时间的某一点的一段时间。这个时间状语常与一般过去时态或过去进行时态连用。例如: ①I graduated from the college twenty years ago. ②I was asked what I was doing a month ago. 4. 表示在某一时间点或事件以前时,只能用before,不用ago。因为这种用法是将before当作介词或连词使用。ago不具有这种功能。例如: ①He will come back before eleven o'clock.

before详细用法

after用法小议 通常用于过去时、现在时(主将从现)或完成时态的句子中。 1. 1. 用作介词,与一段时间连用表示“在…之后”时,注意它与 in的区别:after表示以过去时间为起点的一段时间以后,且通常与过去时态连用;而in则表示以现在为起点的一段时间以后:He came back after two days. 他两天后就回来了。He will come back in two days. 他过两天就回来。但 after 若是与一点时间连用,则可与过去时态也可与将来时态连用:He came back after 4 o’clock. 他是四点钟以后回来的。 He will come back after next month. 他将在下个月以后回来。 eg. 2. I played computer games after I had finished my homework. 做完功课后,我玩电脑游戏。(从句的动作发生在主句的动作前,因此,主句用一般过去式,从句用过去完成时.) Before和after引导的时间状语从句中,由于before和after 本身的词义已经能够表明动作发生的先后,所以主句可以用一般时代替完成时,也可以用完成时。 I knew/had known her long before you knew her.我认识她早在你认识他之前。 After you finish/have finished all your homework,you can watch TV this evening.你完成所有的作业后,今晚可以看电视。

2. 用作连词引导时间状语从句时注意:若主句用将来时态 (或含有将来意味),则时间状语从句要用一般现在时态 (表将来意义)表将来意义,而不能直接使用将来时态:他回来后我就走。正:I’ll leave after he comes back. 误:I’ll leave after he will come back. 3. 用作副词,表示“后来”、“ (一段时间)以后”,通常放在表示时间的副词之后:soon after 不久以后 two days after两天后 The plane was hijacked soon after it took off. Two days later he was gone. 4. 用于习语after all 终究,毕竟:I was right after all. 毕竟我是对的。After all, he’s only six years old. 毕竟,他才六岁。 before用法小结 请先看2005年广东省的一道高考题: The American Civil War lasted four years _______ the North won in the end. A. after B. before C. when D. then

it was+ 一段时间+since还是before从句

1. It is +一段时间+ since从句 在“It is +时间段+ since从句” 句型中,如果since从句的谓语动词是瞬间性动词,表示肯定意义;如果since从句的谓语动词是延续性动词,则表示否定意义。例如: 1) It is / has been ten years since he left Beijing. 译文:自从他离开北京已经十年了。分析:since从句中的left是leave的过去式,是瞬间性动词,表示肯定的意思,left译为“离开” 2) It is / has been ten years since he was a doctor. 他不当医生已经十年了。 分析:since从句中的系表结构表示一种状态,这种状态是延续性的,表示否定意义,译为“不是,不当” 注:时间的计算一律从since从句的动作完成或状态结束时算起。 2. It was / will be +一段时间+

before从句 1) 在“It was + 一段时间+ before从句” 句型中,若主句是一般过去式,从句也是一般过去式时: ①若主句是肯定句,翻译成“过了多长时间之后才……”例: It was long before they found their son. 过了很久他们才找到他们的儿子。 ②若主句是否定形式,翻译成“没过多久就……” 例:It was not long before the couple met again. 没过多久这对夫妻就见面了。 2) 在“It will be + 一段时间+ before 从句”句型中,若主句是一般将来时,从句也是一般现在时: ①若主句是肯定句,翻译成“要过多长时间之后才……” 例:It will be half a year before I come back. 半年后,我才回来。 ②若主句是否定形式,翻译成“用不了多久就……” 例:It won’t be long before we meet

before的详细用法

before的详细用法 Before 在英语中是一个比较常用的虚词,它既可作介词或副词用,也可作从属连词用。在近几年的高考试题中常常出现考查其从属连词用法的题目。其用法如下: 1.表示“在…..之前就…..”。 Mary had finished her homework before her mother returned. 2.表示“过了多久后才…….. ,动作进行到什么程度才……” They walked about 30 miles to the west before they saw a village . 3.表示“来不及;尚未…..就…” He ran off before I could stop him . 4.表示“刚…就…” I had hardly sat down before the bell rang. 5.表示“不知不觉就…..;还没弄清就……” Time passed quickly and three months went by before Aqiao knew it. 6.表示“宁愿…,决不…,与其…,毋宁….”常与will 或would 连用。 I would / will die before I surrender . 7.表示“否则;以免” I will write it down before I forget it . 8.用于句型“it was+时间段+ before …” 表示“过了多久才…” It was three days before he came back. . 9.用于句型“ it was not long +时间段+ before …” 意为“不久就….” It was not long before he sensed the danger of the position . 10. 用于句型“it will be(not )+时间段+ before….”表示“要过多久/ 不久…才…” It will be half a year before you graduate from this school .

before用法

1.表示“在……之前”.说明两个时间或两个事件之间的先后关系. 1)They had got everything ready before I arrived. 在我到达之前他们已经把一切都准备好了. 2)She didn’t understand me before I explained it to her. 在我向她解释之前,她不理解我的意思. 3)The train had left before I arrived at the station. 在我到达车站之前火车已开走了. 2.表示“……才……”,强调从句的谓语动词所表达的时间、距离很长或花费的力量比较大. 1)The workers worked long hours for two weeks before everything returned to normal.工人们长时间地工作了两周,一切才恢复正常. 2)The big fire lasted four hours before the firemen brought it under contro1.大火持续了四个小时,消防队员才把它控制住. 3) We waited a long time before the train arrived.我们等了很长时间 火车才到. 3.表示“还未来得及……就……”,强调主句谓语动词所表达的时间、距离很短或花费的精力比较小. 1)Before I could figure out what had happened, he forced me into the car.我还不知道发生了什么,他就强行把我推进了汽车. 2)He jumped into the water before I could stop him. 我还没有来得及阻止他,他就跳进了水里. 3)Her father died before she was born.她尚未出世父亲就去世了. 4.表示“趁着……”. 1)We can set off early before it gets hot. 我们可以趁着天不热早点出发. 2)You’d better write the phrases down before you forget them. 趁着你还没有忘记,赶紧把这些词组写下来. 3)Please put them away before they are missing. 趁着他们还没有丢,把它们收好吧. 5.表示“一……就”、“刚刚……就”.与hardly.scarcely连用 1)He hadhardly gone to bed before(=when)the door bell rang. 他刚刚睡下,门铃就响了. 2)She had scarcely got off the train before(=when)her daughter ran towards her.她刚一下车,女儿就跑了过来. 6.表示“不知不觉多少时间已经过去了”. 1)He was so absorbed in his work that four hours had passed before he

after,before,since用法区别

after,before,since用法区别 1.after的用法小结 1. 用作介词,与一段时间连用表示“在…之后”时,注意它与in的区别:after表示以过去时间为起点的一段时间以后,且通常与过去时态连用;而in则表示以现在为起点的一段时间以后: He came backafter two days. 他两天后就回来了。 He will come back in twodays. 他过两天就回来。 但after 若是与一点时间连用,则可与过去时态也可与将来时态连用: H e came back after 4 o’clock. 他是四点钟以后回来的。 He will come back after next month. 他将在下个月以后回来。 2. 用作连词引导时间状语从句时注意:若主句用将来时态(或含有将来意味),则时间状语从句要用一般现在时态(表将来意义),而不能直接使用将来时态:他回来后我就走。 正:I’ll leave after he comes back. 误:I’ll leave after he will come back. 3. 用作副词,表示“后来”、“ (一段时间)以后”,通常放在表示时间的副词之后:soon after 不久以后 two days after 两天后 4. 用于习语after all 终究,毕竟: I was right after all. 毕竟我是对的。 After all, he’s only six years old. 毕竟,他才六岁。 2.Before的用法小结 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:

(word完整版)It+willbe+时间段+before等表示“在……之后……才”的句型总结,推荐文档

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……”。 【典型考例】 (1)The 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 (2)—How 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 (3)It ________ 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 解析:答案为BDCC。考题 (1)(2)before 用于肯定的“It + will be + 时间段 + before...”句型中,表示“要过多久…才…”。 (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。 (4)宾语从句中含有句型“It + may be + 时间段 + before...”,表示“也许要过多久才……”,故选择答案C。 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 +时间段+ before …”意为“不久就……”, “没过(多长时间)就……”。 【典型考例】 It was some time ___________we realized the truth. (2005山东) A. when B. until C. since D. before 解析:答案为D。before用于句型“it was +时间段+ before …”表示“过了(多长时间)才……”。该题题意是“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。

Before的详细用法总结

Before的详细用法总结 今天给大家带来Before的用法,我们一起来学习吧,下面就和大家分享,来欣赏一下吧。 Before的用法 我们最初接触的Before一般是作为介词使用的,一般表示空间上的“在…之前” 。 例如:The tea has been set before her.茶已经摆在她面前了。 Before作为介词时,需要注意的是,一般不用在表示具体时间的词之前。比如,两年之前,我们用two years ago,而不能说.efore two years. Before作为介词时,有一个特殊用法需要注意,即before long 表示“不久之后”。 例如:Before long he got married.不久之后他就结婚了。 Before作为连词时,一般意为“在…之前”,用来引导时间状语从句。引导的从句中的动作一般发生在主句动作之后。 Before作为连词时的用法较为复杂,具体要点如下:

一、主句用一般现在时/一般将来时,从句用一般现在时。 例如:You should let me explain what I did before you criticize me. 在你批评我之前,你应该让我解释一下我做过什么。 二、主句用过去完成时,从句用一般过去时。一般翻译为“在…之前就… ”。 例如:1.His father had died before he was born. 他父亲在他出生之前就已经去世了。 2.She had finished her homework before her mother returned. 她在妈妈返回之前就已经把作业完成了。 三、主句用一般过去时,从句用过去完成时。从句用过去完成时表示一个过去没有完成或没来得及做的、时间顺序在后的动作,常译为“★还没(来得及)…就…★ ”。 例如:1.He rushed out of the office before I had realized what was happening. 我还没意识到发生了什么事,他就冲出去了。 2.She left before I had had a chance to speak to her. 我还没来得及跟她说话,她就离开了。

since从句和 before从句

It is +时间段+ since从句和It was / will be + 一段时间 + before从句 1.表示过去的情况 在“It is +时间段+ since从句(从句用一般过去时)”句型中, 如果since从句的谓语动词是瞬间性动词,表示肯定意义;如果since从句的谓语动词是延续性动词,则表示否定意义。 1) It is / has been ten years since he left Beijing. 自从他离开北京已经十年了。 分析:since从句中的left是leave的过去式,是瞬间性动词,表示肯定的意思,left译为“离开” 2) It is / has been ten years since he was a doctor. 他不当医生已经十年了。 分析:since从句中的系表结构表示一种状态,这种状态是延续性的,表示否定意义,译为“不是,不当” 注:时间的计算一律从since从句的动作完成或状态结束时算起。 2.表示过去的情况 “It was+ 一段时间 + since从句(从句用过去完成时had done)”,主句用一般过去时,从句用过去完成时; “It had been + 一段时间 + since从句(从句用一般过去时)”即主句用过去完成时,从句用一般过去时。 It was three years since Jack had been a teacher. 杰克不当老师已经三年了。 3. It was / will be + 一段时间 + before从句 1) 在“It was + 一段时间 + before从句”句型中,若主句是一般过去式,从句也是一般过去式时: ①若主句是肯定句,翻译成“过了多长时间之后才……” It was long before they found their son. 过了很久他们才找到他们的儿子。②若主句是否定形式,翻译成“没过多久就……” It was not long before the couple met again. 没过多久这对夫妻就见面了。 2) 在“It will be + 一段时间 + before从句”句型中,若主句是一般将来时,从句也是一般现在时: ①若主句是肯定句,翻译成“要过多长时间之后才……” 例: It will be half a year before I come back. 半年后,我才回来。②若主句是否定形式,翻译成“用不了多久就……” It won’t be long before we meet again. 我们不久就会见面。

before用法归纳

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 can’t borrow books from the school library ______ you get your student 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 didn’t you 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) 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。

before的用法

Before的用法 一、用作介词 ⒈)指时间上早于,在……之前,如: We finished the work before noon. 中午以前我们完成了工作. 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、用作连词 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。Before she could move, she heard a loud noise, which grew to a terrible roar. 她还没来得及迈步,就听见一声巨响,接着就是可怕的隆隆轰鸣。 →The roof fell before he had time to dash into the room to save his baby. 他还没有来得及冲进房间救孩子,房顶就塌了。 ⒉)用于肯定句中强调主句所表达的时间,距离长,或花费的精力大,译成“才” We had sailed four days and four nights before we saw lands. 我们航行了四天四夜才看到陆地。 We waited a long time before the train arrived. 我们等了很长时间火车才到。 ⒊)用于否定句中,强调主句所表达的时间,距离短,或花费的精力小,译成“不到……就”如: We hadn't run a mile before he felt tired. 我们跑了还不到一英里他就累了。 ⒋)主句含有scarcely等半否定副词时可以译为“刚……就”,这时候主句应用过去完成时态,从句用过去时,还可以用when替代before如: We had scarcely reached the school before/when the bell rang. 我们刚到学校铃声就响了。 ⒌)有时还有“宁愿”的意思 I'd shoot myself before I apologized to him. 我宁死也不向他道歉。 ⒍)用于It+ be/takes+时间段+before句型 在这一句型中又可以根据主从句的时态分成两种情况。 若主句是一般将来时态,从句是一般现在时。若主句是肯定句意思是“要过多长时间才”;若主句是否定形式则翻译成“用不了多久就”。 It will be two weeks before everything returns to normal. 两周之后一切才能恢复正常。 It will be many years before the situation improves. 这种状况或许要过许多年才能得以改善。It won't be long before we meet again. 用不了多久我们就会再见面的。 这时若主句是一般过去时,从句也是一般过去时。若主句是肯定句翻译成“过了多久才……”或“动作进行到什么程度才……”,若主句是否定形式翻译成“没过多久就”。如:

(完整版)before的用法归纳

before的用法是很多的人都比较想要了解的,在众人的心中before的用法是比较难的,我们都非常想要去了解before的用法,但是又谈何容易呢?为了让大家更加快速的了解before的用法,下面我们就和教师一起去看看吧,希望对大家有所帮助。 prep.在……之前;先于,优于;当着……的面;与其…… conj.在……之前;在……以前;比……早些;与其…… adv.先前,从前;在前,在前方 before一词含义广泛,是高考考查的热点词汇之一,但部分考生对该词的用法模糊不清。为了帮助大家掌握,现就对before的用法归纳如下: 一、before用作连词 1. before用作连词时,意思是“在……之前;还没来得及…… 就”。强调主句或从句谓语动词表示的动作发生得过早或过快?例如: Before she could move, she heard a great noise, which grew to a terrible roar. 她还没来得及动弹,就听见有很响的声音,接着就成了可怕的隆隆轰鸣声。 Before I could say a word, she had stormed out of the room. 不等我说一句话,她就冲出了房间。 Don’t count your chickens before they are hatched. 不要高兴得过早。 I must finish my homework before I watch TV.我必须做完作业才能看电视。 It still took seven years before they finally got married. 过了七年他们才最终得以成婚。 It will be only a few minutes before she comes back. 她过几分钟就会回来。 He announced the ending of the meeting before I could get in a word. 没容得我插上一句话,他就宣布散会了? Someone called me up in the middle of the night, but they hung up before I could answer the phone.有人半夜给我打电话,但我还未来得及接他就把电话挂断了? They had talked only a few minutes before they found they were quite different in opinion.他们才谈了几分钟就发现他们的意见很不一致? 注意:before从句若是一个将来的动作,则用一般现在时代替一般将来时,如上句中的comes。 2. 用于It + be + 时间段+ before...句型中,意思是“在……之后才……”。例

before句型辨析与解析

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 (1)(2)before 用于肯定的“It + will be + 时间段+ before...”句型中,表示“要过多久…才…”。 (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。 (4)宾语从句中含有句型“It + may be + 时间段+ before...”,表示“也许要过多久才……”,故选择答案C。 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 +时间段+ before …” 意为“不久就……”, “没过(多长时间)就……”。 It was some time ___________we realized the truth. A. when B. until C. since D. before 解析:答案为D。before用于句型“it was +时间段+ before …” 表示“过了(多长时间)才……”。该题题意是“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。

but,than引导定语从句和before,until用法辨析

but和than引导定语从句的用法 一、but可被看作关系代词,引导定语从句,在句中作主语,在意义上相当于 who not或that not,即用在否定词或具有否定意义的词后,构成双重否定。 如:①There is no mother but loves her children.没有不爱自己孩子的母亲。 ②There was no one present but knew the story already.在场的人都知道这个故事。 二、than作关系代词时,一般用在形式为比较级的复合句中,其结构为形容词比较级(more)...than+从句,than在从句中作主语,相当于that,代表它前面的先行词。(这时,它兼有连词和代词的性质,也有学者认为这种用法的than是连词,后面省略了主语what。) 如:①The indoor swimming pool seems to be a great deal more luxious than is necessary.室内游泳池过于豪华。 ②He got more money than was wanted.他得到了更多的钱。运用上述知识翻译下列句子: 1.任何人都喜欢被赞扬。(but) 2.我们大家都想去桂林。(but) 3.没有人不同情那些嗷嗷待哺的孩子。(but) 4.我们班上没有一个人不想帮你。(but) 5.无论多么荒凉,多么难以行走的地方,人们也能把它变成战畅(but)6.这件事情比想象的要复杂。(than) 7.这个广告的效果比预想的要好。(than) 8.这个问题看起来容易,实际上很难。(than) 9.他爸妈给他的零用钱总是超过他的需要。(than) 10.因为这项工程非常困难,所以需要投入更多的劳动力。(than) 答案: 1.There is no one but likes to be praised. 2.There is no one of us but wishes to visit Guilin. 3.There is no man but feels pity for those starving children.4.There is no one in our class but wants to help you. 5.There is no country so wild and difficult but will be made a theatre of war. 6.This matter is more complex than is imagined. 7.This advertisement is more affective than is expected. 8.The problem may be more difficult in nature than would appear.9.He got more pocket money from his parents than was demanded.

before的用法

before的用法 1.表示“在……之前”。说明两个时间或两个事件之间的先后关系。 1)They had got everything ready before I arrived.在我到达之前他们已经把一切都准备好了。 2)She didn’t understand me before I explained it to her.在我向她解释之前,她不理解我的意思。 3)The train had left before I arrived at the station.在我到达车站之前火车已开走了。2.表示“……才…… ”,强调从句的谓语动词所表达的时间、距离很长或花费的力量比较大。 1)The workers worked long hours for two weeks before everything returned to normal.工人们长时间地工作了两周,一切才恢复正常。 2)The big fire lasted four hours before the firemen brought it under contro1.大火持续了四个小时,消防队员才把它控制住。 3) We waited a long time before the train arrived.我们等了很长时间火车才到。 3.表示“还未来得及……就……”,强调主句谓语动词所表达的时间、距离很短或花费的精力比较小。 1)Before I could figure out what had happened,he forced me into the car.我还不知道发生了什么,他就强行把我推进了汽车。 2)He jumped into the water before I could stop him.我还没有来得及阻止他,他就跳进了水里。 3)Her father died before she was born.她尚未出世父亲就去世了。 4.表示“趁着……”。 1)We can set off early before it gets hot.我们可以趁着天不热早点出发。 2)You’d better write the phrases down before you forget them.趁着你还没有忘记,赶紧把这些词组写下来。 3)Please put them away before they are missing.趁着他们还没有丢,把它们收好吧。5.表示“一……就”、“刚刚……就”。与hardly.scarcely连用o 1)He had hardly gone to bed before(=when)the door bell rang.他刚刚睡下,门铃就响了。 2)She had scarcely got off the train before(=when)her daughter ran towards her.她刚一下车,女儿就跑了过来。 6.表示“不知不觉多少时间已经过去了”。 1)He was so absorbed in his work that four hours had passed before he knew it.他如此专注于工作,不知不觉四个小时就过去了。 2)Time passed quickly and three months went by before he knew it.时间飞快地流逝,他没感觉到三个月已过去了。 7.表示“宁可,宁愿”,相当于rather than。 1)I’d die b efore I apologized to them.我宁死也不向他们道歉。 2)1 would be poor before I got money in this way.我宁愿穷也不愿用这种方式挣钱。8.before常用于句型 “it was +段时间+before……”“过了(多长时间)才…… ”; “it will be……before…… ”“要用(多长时间)才……”; “it wasn’t……before……”“没过(多长时间)就……”; “it won’t be……before……”“用不了(多长时间)就会……”。 1)It was long before he came to help me.过了很久他才来帮我。 2)It wasn’t long before the fire was put out.不久火就给扑灭了。

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