文档库 最新最全的文档下载
当前位置:文档库 › Look Before You Leap

Look Before You Leap

Look Before You Leap

Look Before You Leap

Have you ever make a decision that puts you in a dangerous situation? I have ever experienced this thing, which gives me a lesson on my life. So, I also want to tell you that you must look before you leap, or you would have some troubles.

It was about seven years ago, and I was a senior high school student. One day, I had a question about the mathematics after school, so I talked about it with the other three girls who sit around me. However, when the question was solved, we found the door of our teaching building was already closed. We didn’t know what we should do.

Suddenly, I came up with an idea that we can climb out from the window of the second floor. Even today, I don't know how can I find so stupid a method. While I really did it at that time. However, when I climbed out, I found I didn’t finish this dangerous action. I kept a tight grip on the window and asked for help. Fortunately, my friends fastened my arms and pulled me in. When I stand on the earth again, I felt my clothes was already wet by the sweat. Of course, I was blamed by my friends. One of them said “Never try this dangerous thing again. We explain to our teacher this afternoon, and I believe he will forgive us.”Finally, we just stayed in our classroom the whole noon.

I still felt afraid every time I think about this incident. Thanks to my friends, otherwise I don’t know what pain I will suffer from. So, friends, please remember my lesson that look before you leap.

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.

浅析before和until的区别

浅析before和until的区别 在日常的英语学习中,我们遇到before和until时,往往会将二者搞错。其实,只要我们能把握住两者在使用时本身的含义及主句动词是终止性的还是延续性的,是肯定式还是否定式两大特点,就能很容易地解决这类问题。 一、在下列情况下,两者可互换用,但含义略有不同。before表示“在……之前”的意思,强调时间先后关系;而until表示“直到……才”的意思,主句是肯定句则表示主句动作的终止时间;主句是否定句则强调主句动作的起始时间。 1.主句为否定式终止性谓语动词。常见的动词是open, start, leave, arrive, finish, stop等。例如: (1)The noise of the street didn’t stop until/before it was midnight. (2)The children won’t come back until/before it is dark. (3)I didn’t leave the lovely boy until/before his mother came home. 2.主句为肯定式、延续性谓语词,这类动词用stand, stay, talk, be, wait等。例如: (1)He lived with his parents until/before he graduated from school. (2)I will wait until/before he comes to my help. (3)I shall stay here until/before you come back. 二、下列情况下宜用before不用until.

引导时间状语的介词in on at during till与until的用法

引导时间状语的介词in/on/at/during/till与until 1、用in的时间短语有: ① 表示一天中的某段时间:in the morning;in the afternoon;in the evening ② 表示周、月份、年份:in a week;in January;in Feb;in 1992 ③ 表示季节:in summer;in spring;in autumn;in winter in+表示时间长度的短语可以表示“在某段时间之内”,这时可以与现在时、过去时或将来时连用,一般与完成某动作有关;还可译为“……时间之后”,一般与将来时连用。根据时态判别in 表示的含义in twenty minutes' time 20分钟之后 We will finish class in half an hour. 2、用on的时间短语有: ① 表示星期:on Monday;on Friday ② 表示日期:on June 1st;on 23rd March(在书写日期时没有冠词,但在口语中则分别读为:on June the first;on the 23rd of March) ③ 表示星期+日期:on Monday, June 1st ④ 表示具体时间:on Wednesday evening;on fine afternoon;on that day 3、用at的时间短语有: ① 表示确切的时间:at five to twelve;at ten o'clock ② 表示用餐时间:at lunch/dinner time;at teatime ③ 表示其他时刻:at night;at noon;at midnight;at that time

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

Until的详细用法总结

Until的详细用法总结 你们知道until用法吗?我们一起来学习学习吧,下面就和大家分享,来欣赏一下吧。 Until的用法 比较until和till 此两个连词意义相同。肯定形式表示的意思是"做某事直至某时",动词必须是延续性的。否定形式表达的意思是"直至某时才做某事"。动词为延续性或非延续性都可以。正确使用这两个连词的关键之一就在于判断句中的动词该用肯定式还是否定式。 肯定句: I slept until midnight. 我一直睡到半夜时醒了。 Wait till I call you. 等着我叫你。 (在肯定句中可用before代替Lets get in the wheat before the sun sets.) 否定句: She didnt arrive until 6 oclock.

她直到6点才到。 until 用法上的三个难点 一、 1. until用在肯定句,谓语动词通常是延续性动词,如stand, stay, talk, wait等,表示主句动作终止的时间。如: ③I waited until he cam e back.我一直等到他回来。 ④The war lasted until 1945.战争持续到1945年。 如果用在否定句,谓语动词通常是瞬间性动词,如open, start, leave, arrive, finish, stop等,强调主句动作开始的时间。如: ⑤I didnt leave the boy until his mother turned up.直到这孩子的母亲来,我才离开。 ⑥The noise of the street didnt stop until it wa s midnight.街上的噪音直到半夜才停止。 2.连词until引导的从句中谓语动词的时态 1)until后面的从句中不能用一般将来时,应该用一般现在时代替。所谓的“主将从现”。 He will stay here until his mother comes back.

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:

Till能否用于句首

龙源期刊网 https://www.wendangku.net/doc/688723946.html, Till能否用于句首 作者:刘春丽 来源:《新课程·中旬》2013年第05期 摘要:在教学中为能充分准确地给学生展示语法until和till的用法,分别从教辅资料和网上教学视频中收集资料,却意外地在一知名学校的视频中发现不妥之处。为此,通过查阅其他教辅资料和观看多个网络视频后得出,某知名学校的教学视频有误,继而反省并警示自己须审慎对待教辅,教学应准确科学。 关键词:until/till;教学;句首 一、遇到的疑惑 最近的教学中遇到一个疑惑,即until和till谁能用于句首的 用法问题。我们用的是《百年学典·高中全程学习导与练》,关于这两个词的用法如下:till和until(till不可位于句首),在肯定句中,主句的谓语动词是延续性动词,而在否定句中,主句的谓语动词是瞬间性动词。如:He waited until/till his mother came back.(他一直等到他妈妈回来。)I didn’t go to bed until I finished my homework.(直到做完作业我才上床睡觉。)为了更好地呈现这一语法点,我利用网络在某视频教育频道教育列表下的考试辅导一栏里面找了些视频材料,其中在一个PPT里发现有疑问地方,此下为该视频的文字摘录: till可用于句首,而until通常不用于句首,通常用于句中。 e.g. I had heard nothing of what happened until you told me. ***“not...until”的四种不同句式 1.正常句式 We didn’t go home unt il we finished our homework. 2.Until在句首 Until we finished our homework,we didn’t go home. 解释:因为从句的位置可以放在主句前,所以a中的句子可改换成b中的句子,但改换后我们发现,until放在了句首的位置,因为until不能用于句首,所以这个句子是错的,解决办法是把主句中的否定词not提前到until前面,所以我们有下面这个句子: Not until we finished our homework did we go home.

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。

2021届新高考英语语法讲义时间状语从句中until till用法知识点整理总结

2021届新高考语法讲义时间状语从句中until till用法知识点整理总结 今天我们继续学习时间状语从句的引导词until和till,以及具有怀旧意味的not…until结构的用法。 01 until/till用法概述 until和till都是“直到…”的意思,从字面上来看,二者都表示一个动作持续到一定时候。那么与二者连用的动词都必须是延续性的。 之前我们讲过,延续性有两种情况:一是动词本身是延续的;二是短暂性动词的否定状态。 如: He stayed in her room until/till midnight. 他在她的房间待到了深夜。 He didn't leave her room until/till midnight. 他直至深夜才从她的房间离开。 02 在肯定句中 until/till在肯定句中表示“直到…”,主句的动词必须是延续性动词,表示一个动作直到某个时间才停下来。如: You may stay here until/till the rain stops. 您可以在雨停之后在离开。

The child remained silent until/till the movie ended. 电影结束之前,那个孩子都很安静。 03 在否定句中(not…until/till结构) 我们一般将n o t…u n ti l/ti l l结构翻译成“直到…才”。句子中必须要用短暂性动词,这样用n o t进行否定后就变成了延续性动词。如: T h e ch i l d di dn't f a l l a sl e e p u n ti l h i s m o th e r ca m e b a c k. 妈妈回来后,那个小孩才睡着。 此外,当not提前时,要用倒装结构,如: Not until you mentioned it, did I have any idea of it. 直到你提到它,我才想到它。 04 until和till的小区别 until和till基本可以换用,但until可以位于句首,till则不可以。如:Until he told me the news, I had no idea of it. 直到他告诉我,我都不知道这个消息。

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。

when, if, before, until从句

when if before until引导的从句 由一个主句和一个或多个从句构成的句子叫复合句。主句是复合句的主干部分,从句是修饰主句或主句的某个成分的。从句不能单独成句,但具有主语和谓语,须由关联词引导。根据从句在主句中充当不同的成分,可分为不同的从句,例如,主语从句、宾语从句、表语从句、同位语从句、定语从句、状语从句等。 由when, if, before, until引导的从句 一、when引导的时间状语从句 (1) when引导时间状语从句时,表示“当……的时候” ① when既可以指时间段也可指时间点 Her brother was very fat when he was a child. 她哥哥小时候很胖。 They were talking when the teacher came in. 老师进来的时候,他们正在讲话。 ② when从句中既可用延续性动词又可用非延续性动词 You should keep your room clean and tidy when you live here. 在你住在这里的时候,你应该保持你房间干净、整洁。 When he arrives, he’ll tell us about the match. 他回来的时候就会告诉我们比赛的情况。 ③ when从句动作既可和主句的动作同时发生又可在主句的动作之前或之后发生Mary was doing her homework when her father was reading newspapers. 玛丽的爸爸在看报纸的时候她正在做作业。 I’ll call you when I get to the airport. 我一到机场就给你打电话。 二、if引导的条件状语从句 条件状语从句表示主句动作发生的条件,条件有真实和非真实两种。if引导条件状语从句时,意为“如果,假如”,表示在某种条件下,某事很可能发生。 if除了引导条件状语从句,还可引导宾语从句。 if引导的条件状语从句和宾语从句的区别: (1)if 在句中的含义不同 If 在宾语从句中翻译为“是否”,相当于whether I want to know if he is a teacher. If 在条件状语从句中翻译为“如果” I’ll go to see you if I am free next week.

Before和ago的区别(精华版)

before和ago的区别 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:

高中英语重点系列until引导的时间状语从句(无答案)-精

重点3 until 引导的时间状语从句 …until….“直到……时候”;not…until…“直到……才……” 例句: You are to stay until/till your mother comes back. The meeting was put off until ten o’clock. The villagers didn’t realize how serious the pollution was until all the fish died in the river. →Not until all the fish died in the river did the villagers realize how serious the pollution was. He didn’t go to bed until his mother came back. →It was not until his mother came back that he went to bed.(强调句) Not until he failed in the exam did he realize that he had wasted much time playing computer games. Not until his son came back from school did he go to bed. 练习: 句型转换(强调until 从句) 1. They didn’t stop until they succeeded at last. (强调until 从句) 2. We didn’t give up our efforts until we saved everyone injured in the accident.(强调until 从句) 3. The people there didn’t break up until the police arrived.(按照要求改写句子) Not until___________________________________________________ 4.The audience didn’t leave the theater until the rain stopped. (按照要求改写句子) Not until __________________________________________________ 选择最佳选项 1. It was not until I came here _____I realized this place was famous for not only its beauty but also its weather. A. who B. that C. where D. before (2012湖南) 2. —What was it that you had ____ last night? It was too noisy. --- Oh, sorry. It was the washer. I promise you it won’t happen any more. A work B working C to work D worked 3. It was __ was a waste land ten years ago ___ a modern city has been set up on. A which, where B where , that C what, that D that, which 4. –-How long is _____ the man-made satellite _____ is made in our country to orbit the planet a round? ---48 hours, to be exact. A. it, that it takes, which B. it , when, that C. it ,for , that it takes D. it, that , where 5. -- _____ matters to do the job well ---what you are or where you come from? -- Neither. It depends on whether you put your heart into it. A . which is it that B. what it is that C .which it is that D .what is it which 6. –Did Jack come back early last night? –Yes. It was not yet eight o’clock _____ he arrived home.(福建) A. before B. when C. that D. until 7. I won’t t ell the student the answer to the math problem until he _____ on it for more than an hour.(湖北) A. has been working B. will have worked C. will have been working D. had worked

Before和ago的区别

before ago 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。

相关文档