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before

before
before

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,也可作附属连词用。在近几年的高测验题中通常出现考察其附属连词用法的标题。下面就把before 作附属连词的用法归纳如下: 1. 表现“在……之前就……”。比方:

Mary had finished her homework before her mother returned.

在她妈妈返来之前玛丽就已经完成了作业。

2. 表现“过了多久后才……;举动举行到什么程度才……”。比方:

The man almost knocked me down before he saw me.

那个男子差点把我撞倒才望见我。

They walked about 30 miles to the west before they saw a village.

他们西行了大略30 英里才望见一个墟落。

They worked day and night about three days before everything returned to normal.

他们昼夜劳动了大略三天,一概才收复平常。

3. 表现“来不足;尚未……就……”。比方:

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

我还没来得及插话,他就已经给我量好了尺寸。

He ran off before I could stop him.

我还没来得及禁止他,他就已经跑了。

She left the company before I could have a word with her.

我还没来得及和她打声招呼,她就已经脱离了。

4. 表现“刚……就……”。比方:

I had hardly sat down before the bell rang.

我刚坐下铃就响了。

5. 表现“无声无息就……;还没弄清就……”。比方:

Time passed quickly and three months went by before Aqiao knew it.

时间过得很快,无声无息阿巧已经度过了三个月。

6. 表现“甘愿宁可……,决不……;与其……,毋宁……”,常与will 或would 连用。比方:

I would die before I would tell.

我宁死不说。

I'd shoot myself before I apologized to him.

我宁死也不向他致歉。

I would / will die before I surrender.

我宁死不平。

7. 表现“不然;以免”。比方:

Do it now before you forget.

如今就做,免得忘了。

I'll write it down before I forget it.

我得记下来以免忘了。

8. 用于句型“ It was + 时间段+ before ... ”,表现“过了多久才……”。比方:

It was three days before he came back.

三天后他才返来。

9. 用于句型“ It was not long before ... ”,意为“不久就……”。比方:

It was not long before he sensed the danger of the position.

不久他就认识到了处境的危急。

10. 用于句型“ It will be (not) + 时间段+ before ... ”,表现“要过多久/不久……才……”。比方:

It will be half a year before you graduate from this school.

半年后你才气从这所学校毕业。

It will be not long before you find you are wrong.

不用多久你就会觉察你是错的。

本文结合典型例题来归纳一下before的特殊用法。

before作为连词时的基本意义是“在……之前”,用于表示时间或顺序。如:Turn the light off before you sleep. (睡前先把灯熄掉。) Think before you speak. (说话之前,应先想清楚。) 但在不同的语境中before有不同的意义:

1.before表示“不等……就……”、“尚未……就……”

例1:—Why didn’t you tell him about the meeting?(2006年四川)

—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。题中before意为“不等……就”、“尚未……就……”,它表示从句的动作尚未来得及发生,主句的动作已发生或完成。全句句意为:我还没来得及说他就冲出了房间。又如:

Before I could get in a word, he had measured me.我还没有来得及插上话,他就给我量好了尺寸。

The phone stopped ringing before I answered it.我还没有来得及接,电话就挂了。

2.before表示“不知不觉,还没弄清就……”(常用于before sb. know/realize…) 例2:Several weeks had gone by_____ I realized the painting was missing. (2004全国)

A. as

B. before

C. since

D. when

解析:此题最易错选C或D项,而正确答案为B。用since则时间延续到了现在,在时间上与had gone矛盾;用when则无法强调时间流逝的不知不觉性。又如:Time passed quickly and three months went by before I knew it.时间飞快地流逝,不知不觉3个月过去了。

3.before表示“以免,不然”

例3:It’s cloudy. Take an umbrella_____ you regret it.

A. but

B. and

C. after

D. before

解析:and及but表示并列关系,不合语境;after意为“在……之后”,不合常识,应是在下雨前带伞;before在此处意为“以免你后悔”。before作此意义的用法的例子不少,又如:

Put that away before it gets broken.把它收好,以免砸了。

Do it before you forget.尽早动手,不然忘了。

4.before用于it was / will be +时间+before ... 句型中。

例4:It won’t be long_____ you regret what you have done.

A. after

B. before

C. since

D. until

解析:It was / will be +时间+before ... 表示“过了多久才…(强调时间的长)”,在否定句中则表示“没过多久就…(强调时间的短)”。例如:

It will be two years before we meet again.我们要过两年才能见面。

It wasn’t long before he married again. 不久他就又结婚了。

We didn’t wait long before he came back. 我们没等多久他就回来了。

5.before表示“与其……宁可……,比……优先”(用于表优先顺序)

例5:They would fight to death_____ they surrendered(投降).

A. before

B. after

C. since

D. because

解析:答案为A。before引导的从句在与will, would连用时,有“宁愿……也不”的含义。before即使是作介词用也有此意义。例如:

True men choose death before dishonor. 大丈夫宁可杀不可辱。

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. the [解析] 答案为B。本题考查连词before的用法。before含有“在……之后才……”之意,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 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,现就对它的用法归纳如下一、before用作连词1.before用作连词时,意思是“在……之前;还没来得及…… 就”。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。2.用于It + be + 时间段+ before...句型中,意思是“在……之后才……”。例如:It will be five years before I come back. 我五年后才能回来。It was not long before the enemy was driven out of their country. 不久之后,敌人就被赶走了。如果主句中用否定式,则表示“不多久……就”。It won’t be long before they understand each other. 他们不久就会互相了解的。3.还有“趁……(还没有)”之意。例如:They are thinking of buying the house before the prices go up. 他们正在考虑趁房价未涨时把房子买下来。Do it before you forget it. 趁早动手,以免忘了。二、before用作介词before用作介词时, 可以指时间“earlier than在……之前”,也可以指位置“in front of在……之前”。例如:There is nothing that has not been bitter before being ripe. 凡事在成熟前,都是有苦味的。Don’t put the cart before the horse. 不要本末倒置He was brought before the judge. 他被带到法官面前。三、before用作副词before用作副词时,意思是“at an earlier time / in the past以前”。例如:I’ve seen the film Titanic before. 我以前看过《泰坦尼克》这部电影。I have never seen such beautiful flowers before. 我以前从未见过如此美丽的鲜花。

四、短语before long与long before的区别before long是“很快,不久”的意思, 可以用于各种时态。例如:Before long, he went to America. 不久,他就去了美国I hope to see you before long. 我希望不久后再见到你。而long before是“很久以前”的意思,一般用在过去时或过去完成时的句子里。例如:She said she had read the novel long before. 她说她很久以前就读过这部小说That happened long before. 那件事发生在很久以前。[巩固练习]1. It _______ long before we _______ the result of the experiment.A. will not be; will know B. is; will knowC. will not be;

know D. is; know2. It was about five hours _______ the workers shipped all the goods.A. since B. when C. after D. before3. It was evening _______ we reached the little town of Winchester.A. that B. until C.

since D. before4. 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. when5. It was some time ____ we realized the truth.A. when B. until C. since D. beforeKeys:1-5: CDDCD二. It is … when …可用于下面两种场合:1. when 是连词,引导时间状语从句,意为“……的时候已是几点钟”。例如:It was eight o'clock in the morning when they went shopping.当他们去买东西的时候已经是上午8 点了。2. when 是关系副词,引导定语从句,它本身在从句中作时间状语。例如It was July 10,1992,when he graduated from Nanjing University他1992 年7 月10 日毕业于南京大学。三. It is / has been + 一段时间+since 从句。例如:It is / has been three years since we saw each other last time.我们上一次见面是在3 年前。It is four years since I became a student我上了4 年学了。(注意:状语从句中常用短暂性动词的一般过去时作谓语动词)“ It was + 一段时间+since 从句”结构。可理解为:从更远的过去某一时间点,延续了一段时间直至过去的一个时间点,从句中用过去完成时作谓语。例如:It was two years since he had left here.他离开这儿有两年了。注意:since 从句里的谓语动词是瞬间动词时,表示这段时间从该动作开始时算起;since 从句里的谓语动词是延续性/ 表状态的动词时,则表示这段时间从动作结束时算起。例如:It's five years since he lived here.他离开这儿有5 年了。(live 为延续性动词It's ten years since he joined the army.他参军已有10 年了。(join 为瞬间动词)四. It is + 一段时间+before+ 从句。在该句式中,before 引导的是时间状语从句。这样的从句中通常用一般现在时表示将来时间。例如:It will be hours before he arrives at the bus stop.他到车站得好几个小时。It was not five hours before Tom left for Shanghai.不到五个小

时汤姆就去上海了。注意:常出现在before 前面的词或短语有:long,not long,years,months,days,hours,minutes 等。其肯定式表示“过多久……就/ 才……”,否定式表示“不久……就/ 才……”。

before与ago、when,while,as区别

一、before与ago的区别 1.ago表示“从现在起的若干时间以前”,意思是“距今……以前”,需和过去时或过去进行时连用。before泛指“从过去起的若干时间以前”,意思是“距过去某时……以前”“与其……(毋宁)”,常和完成时连用,尤其在间接引语中,如:I visited him three days ago, but he had gone to Shanghai a week before.我三天前去访问他,但他已与那时的一周前到上海去了。 His parents died ten years ago.他父母十年前都去世了。 He said that his parents had died ten years before.他说他父母亲十年前都去世了。 I have never been there before.我以前从来没有去过那里。 2.如果不具体表明多少时间以前,只用before不用ago,意为“从前、以前”。before仍以副词的形式置于被修饰语后,常与完成时候过去时连用。如: Have you seen this film before? He asked me whether I had been to the Great Wall before. 3.表示在某一点时间或事件以前时,只用before不用ago,这种用法是将before当作介词或连词使用。ago不具有这一功能。如: They will come back before six o’clock. It is hoped that this will be finished before the year 1995.希望这件工作将在1995年以前完成。 另外,before在句中的含义较多。不少句子中,before虽然引导的也是一个时间状语,但是译成汉语时却不必译为“在……以前”。 a.如果before引导的从句动作发生得晚或慢,可译成“……才”。这是主句主语或是名词、代词,或用it作形式主语. He had almost knocked me down before he saw me.他几乎把我撞倒才看见我。 It will be hours before he arrives.要过几个钟头他才回到达。 You must sow before you can reap.有播种才能有收成。 b.如果强调从句动作发生之前,主句动作已发生,可译成“未……就”或“还没有……就”。

keep 的用法

Keep的用法: keep vt., vi. kept, keeping 保留;保守 I keep old letters.我保存旧信。 I'll keep the original copy of your report on file. 我会把你报告的原件归档的。 It's an interesting suggestion and we'll keep it on ice." 这是一项有趣的建议,我们将留待以后考虑采用。" 保持;继续 We will keep on trying and, if we get anything done, will notify you. 我们将继续努力,有结果将通知你。 Leaders shouldn't keep themselves aloof from the masses. 领导人决不应该脱离群众。 Keep calm!安静! You shouldn't keep chopping and changing like this; you'd better make up your mind right now! "你不能再这样变化无常了,最好现在就拿定主意!" 遵守 He keeps to his promise.他守约。 "Everyone should keep discipline, and you, officers are no exception." "每个人都应该遵守纪律,你们军官也不例外。" 保卫;保护 Keep the baby warm.别把婴儿冻着。(常与from连用)防止;抑制 Keep one's temper。抑制住不发脾气。 Keep a curb on your anger.请抑制住怒气。 扣留;留下 Please keep me a place in the queue.请在队里给我留个位置。 赡养;饲养 to keep a dog养狗 Farmers usually keep chickens in their backyard. 农民们通常在自己的后院养鸡。 经营;经销;管理 to keep a shop开商店 to keep house治家 (常与from连用)远离;不接触 Keep away from the scene of the accident.勿靠近事故现场。 Their dog looked dangerous, we decided to keep our distance from it. 他们家那条狗样子很凶恶,因此我们决定离它远一点。 But the stone walls keep the farmer's cows from joining his neighbor's cows. 但是石头墙使这家农民的母牛不会加入到邻居的牛群中去。

before的特殊用法教学文案

b e f o r e的特殊用法

before的特殊用法 before在高考的单项选择、完形填空以及短文改错中考的较多,尤其它的特殊用法。它的特殊用法主要有以下几种: 1.用于“It will /won’t be+时间段+before…”句型,表示“….之后才…. ;用不了多久就…;”另外还表示“不到…就…;刚…就…;到…之前”。 It will be two weeks before everything returns to normal . 两周之后一切才恢复正常。 It won’t be long before we meet again .用不了多久我们就会再见面的。 It may be many years before the situation improves .这次状况或许要过很多年才能得到发展。 It was some time before I realized the truth . 过了很长一段时间我才了解到真相。 I will ask you some questions before I give my answer .在我没有作答前,我要先问你几个问题。 We waited a long time before the train arrived .我们等了很久火车才到。 We hadn’t run a mile before he felt tired .我们跑了还不到一英里他就累了。 2.以免,不然, 趁着 Lock your bike before it gets stolen .锁好你的车子,以免被偷。 Put that away before it gets broken .把它收拾好,免得砸碎了。 We must take measures to protect endangered wildlife before it is too late .趁还不算太晚,我们必须采取措施保护濒临灭绝的野生动物。 3.宁可,宁愿 I’d die before I apologized to them !我宁死也不向他们道歉!

英语比较级的用法总结

☆形容词的比较级☆ 当我们需要对事物作出比较时,需要用到比较级。 比较级的句子结构通常是: 什么 + 动词be (am , is , are ) + 形容词比较级 + than(比)+ 什么 ,如: I’m taller and heavier than you. (我比你更高和更重。) An elephant is bigger than a tiger.(一只大象比一只老虎更大。)形容词的比较级是在形容词的基础上变化而来的,它的变化规则是: ①一般的直接在词尾加er ,如 tall - taller , strong - stronger , ②以e结尾的,直接加r ,如 fine – finer , ③以辅音字母加y结尾的,先改y为i再加er,如funny - funnier ④双写最后的字母再加er,如big – bigger, thin – thinner , hot – hotter 除此之外,还有几个特殊的单词,它的比较级和最高级都是不规则的,如:many / much(原形)– more(比较级)– most(最高级) little / few(原形)– less (比较级)– least(最高级) good(原形)– better(比较级)– best(最高级) bad (原形)– worse(比较级)– worst(最高级) far (原形)– further– furthest 附加:形容词的最高级变化类似于比较级,只是把词尾的er改成est,如: tall (原形)- taller (比较级)- tallest (最高级) long(原形)- longer(比较级)- longest(最高级) big (原形)- bigger(比较级)- biggest(最高级) ☆注意☆比较的两者应该是互相对应的可比较的东西。

详解ago与before的语法难点

详解ago与before的语法难点 1. before还是ago? 要说: I came to Manchester two weeks ago.I came to Manchester two weeks ago. 不要说: I came to Manchester before two weeks. Use past time + ago ago用于一般过去时,例如: 10 years ago, a long time ago, a few weeks ago, a couple of days ago Use before + action / event before用于动作或事件前,例如: before you left, before we start, before lunch 2. fall 还是reduce? These two words are the opposites of rise and raise: 它们是rise和raise的反义词: something falls (e.g. the price fell) somebody reduces something (e.g. the company reduced the price) You will probably use fall to describe numbers on a graph

or chart for IELTS Writing Task 1: 在雅思短作文中,你可以用fall来描述图表里的数字。 In 2008, the number of customers fell. (verb, past) 这里的fall是动词,过去时。 There was a sharp fall in Internet usage. (noun) 这里的fall是名词。 Reduce and reduction are probably more useful for Writing Task 2: reduce和reduction在长作文中更有用: We need to reduce the amount of pollution from exhaust fumes. (verb) reduce,动词。 Recycling leads to a reduction in waste. (noun) reduction,名词。 3. because还是because of? Compare these two sentences: 比较下列两个句子: I stayed at home because the weather was bad. I stayed at home because of the bad weather. The important difference is the use of the word was in the first sentence. After because, you need a subject and a verb (e.g. the weather was). After because of, we dont use a verb,

keep的用法

1.keep +形容词 2.keep+sth/sb +形容词 3.keep +doing 一直做某事 4.keep ... from doing ... 阻止做某事。。。 5.keep a pet 饲养一个宠物 6.How long may I keep this book ? keep指借。 keep的用法小结 keep是高考常考词汇之一,其含义丰富,与其搭配的短语也很多,其主要用法如下: A、用作及物动词 (1)保留、保存、保持、留下 e.g. We'd better keep a seat for him. 我们最好给他留个座位。 He kept all the money in the bank. 他把所有的钱都存入了银行。 (2)履行(诺言)遵守 e.g. One should keep one's promise. 一个人应当遵守自己的诺言。 Everybody must keep the law. 人人都必须守法。 (3)赡养,养活,饲养 e.g. He has a large family to keep. 他有一大家人要养活。 The old man kept many animals like dogs, pigs and cats. 这位老人养了许多动物,像狗、猪、还有猫等。 (4)经营,管理

e.g. He kept a hotel in this city. 在这座城市里,他开了一家旅店。 She is good at keeping house. 她擅长管理家务。 (5)保守(秘密),记(日记、帐) e.g. All of the people keep the Spring Festival in our country. 我国所有的人都庆祝春节。 Some of them keep birthdays. 他们中有些人庆祝生日。 (7)使……处于某种状态(情况) 在这种情况下,keep常跟复合结构(keep+宾语+补语)。用作宾语补足语常见的词有现在分词、过去分词、形容词、副词以及介词短语。 e.g. He kept me waiting for half an hour. 他让我等了半个小时。 Keep your mouth shut and your eyes open. 少说话,多观察。 The doctor kept me in for a week. 医生一周没让我出去。 He always keeps his books in good order. 他总是把书放得整整齐齐。 B、用作不及物动词 (1)保持、继续(处于某种状态)(keep为连系动词)

比较级的用法知识点总结

比较级的用法知识点总结 1.可以修饰比较级的词,much,a lot,far,…的多a little, a bit,…一点儿 even甚至,still仍然 例如,Lesson One is much easier than Lesson Two.第一课比第二课容易得多。 She drives still more carefully than her husband.她开车仍然比她丈夫还认真。 2.比较级常用的句型结构 (1)“甲+be+(倍数)+形容词比较级+than+乙”表示“甲比乙…”或“甲比乙…几倍” 例如,Tom is taller than Kate.汤姆比凯特高。 “甲+实意动词+(倍数)+副词比较级+than+乙”表示“甲比乙…”或“甲比乙…几倍” 例如,I got up earlier than my mother this morning.我今天早晨起床比我妈妈还早。 (2)“甲+be+形容词比较级+than+any other+单数名词(+介词短语)”表示“甲比同一范围的任何一个人/物都……”,含义是“甲最……”。 例如,The Yangtze River is longer than any other river in China. =The Yangtze River is longer than any of the other rivers in China.长江比中国的任何一条其他的河都长。

=The Yangtze River is longer than the other rivers in China.长江比中国的其他所有的河都长。 =The Yangtze River is the longest river in China.长江是中国最长的河流。 注意:The Yangtze River is longer than any river in Japan.长江比日本的任何一条河都长。 “甲+实意动词+副词比较级+than+anyother+单数名词(+介词短语)”表示“甲比同一范围的任何一个人/物都……”,含义是“甲最……”。 例如,Mike gets to school earlier than any other student in his class. = Mike gets to school earlier than any of the other students in his class.迈克比他们班上任何一个其他的同学到校都早。 = Mike gets to school earlier than the other students in his class.迈克比他们班上其他的同学到校都早。 = Mike gets to school earliest in his class.迈克在他们班 到校最早。 注意:Mike gets to school earlier than any student in Tom’s class.迈克比汤姆班上任何一个学生到校都早。(迈克和汤姆不是同一个班) (3)“甲+be+the+形容词比较级+of the two+……”表示“甲是两者中较……的”。

ago和before的区别及用法有哪些

ago 只作副词,必须与一段时间连用,表示以现在为起点一段时间之前。before既可以作副词也可以作连词。作副词时,可以单独使用;也可以和一段时间的词连用,表示的是已过去某个时间为起点一段时间之前。 ago 和before的区别 1、意思不同 ago 表示“从现在起若干时间以前”。 before 表示“从过去某时起若干时间以前”。 2、词性不同 ago只能作副词。 例句: She left England three days ago. 她三天前离开了英格兰。 before既可作副词又可作介词和连词。 例句: Please close the window before you leave. 离开前请关好窗户。(连词) 3、后接单词不同 ago常与动词一般过去式连用。 例句: His grandfather died two years ago. 他的外公两年前去世了。 before常与过去完成式连用。

例句: I had finished the work two days before. 两天前我就已经完成了工作。 ago的用法 1、用于一般过去时。 例句: A short while ago, my sister helped me to carry one of my old bookcases up the stairs. 片刻之前,我妹妹帮我把我的一个旧书柜抬上了楼。 2、所指的时间是从现在算起。 例句: It was stolen twenty years ago when Ted was a boy of fifteen. 那辆自行车是在20年前当泰德还是个15岁的小伙子时被偷去的。 before的用法 1、用于过去完成时 例句: A short time before, great trees had covered the countryside for miles around. 在那时不久之前,高大的树木覆盖着方圆数英里的地方。 2、它所指的时间不是从现在算起,而是从过去某一时刻算起,有时可以与previously 换用 例句: Last summer, I finally left the firm that I had joined eighteen years

keep的用法

用作动词(v.) keep about〔around〕1( v.+adv. ) 1. 继续履行职责go on with one's duties keep about〔around〕 She is very ill, but she still keeps about. 她虽然病得很重,但仍然继续工作。 2. 使手边常有have sth always present keep sth ? about〔around〕 I like to keep a few envelopes around in case I need them.我喜欢手边常有几个信封,以应不时之需。 keep about〔around〕2 ( v.+prep. ) keep abreast of( v.+adv.+prep. ) keep after( v.+prep. ) keep aloof( v.+adv. )

keep apart( v.+adv. ) keep at( v.+prep. ) keep away( v.+adv. ) keep away from( v.+adv.+prep. ) keep back( v.+adv. ) keep behind1( v.+adv. ) keep behind2 ( v.+prep. ) keep by1( v.+adv. ) keep by2( v.+prep. ) keep down( v.+adv. ) keep for( v.+prep. ) keep from( v.+prep. ) keep going( v.+adj. ) keep in1( v.+adv. ) keep in2( v.+prep. )

(完整版)英语比较级的用法

英语比较级的用法 一忌使用双重比较级 即构成比较级时不能既加词尾-er,又在其前加more。如: 他的英语比我的英语好多了。 误:His English is more better than mine. 正:His English is much better than mine. 【注】虽不能说more better, most earliest 之类的,但可用“比较级+and+比较级”这样的形式: It’s getting warmer and warmer. 天气变得越来越暖和。 I’m getting fatter and fatter. 我越来越胖了。 We’re going more and more slowly. 我们越走越慢了。 要想加强比较级的语气,可用much, far, even, still, rather等修饰。如: This is very much cheaper. 这个便宜得多。 This one is even more expensive. 这个更贵些。 The patient is much better now. 病人现在好多了。 二忌比较对象不一致 如果有人问你“一公斤苹果多还是一尺布多”时,你会怎么回答?你肯定认为无法回答。对,无法回答,因为它们“单位”不一样,或者说它们不是同一类型的两个比较对象。在使用英语的比较级时,也要特别注意不要“比”错了对象。如: Her French was no better than mine. 她的法语比我好不了多少。 My dictionary is more useful than yours. 我的词典对你的词典更有用。 All your neighbours are noisier than ours. 你们的所有邻居都比我们的吵闹。

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.

Keep_用法

Keep 用法知多少 keep 是英语中用法灵活的动词之一,用法归纳如下: 一、用作系动词,意为“保持(某种状态)”,其后常接形容词作表语。如: Please keep quiet / silent! 请保持安静! After the accident, he still kept alive. 这次事故之后,他仍然活着。 二、用作实义动词,可表示: 1. 保管;保存;保留。如: Keep the change. 零钱不用找了。 Please keep these things for me while I am away. 在我离开期间,请你替我保管这些东西。 2. 赡养;饲养。如: Does he earn enough to keep himself and his family? 他的收入够养活他自己和他的家人吗? I used to keep sheep in my childhood. 我在孩提时常常养羊。 3. 经营。如: Her father kept a grocer's shop for a number of years. 她父亲开了几年杂货店。 4. 坚持;继续。后面如接动词,要用V-ing 形式作宾语。如: If you keep (on) practising your spoken English, you'll soon make great progress. 如果你坚持练习英语口语,你很快就会取得很大的进步。 5. 阻止;阻碍。常用于keep sb/sth from doing sth 结构中,其中介词from 不能省略。如: The heavy rain didn't keep them from watching the football match. 大雨没能阻止他们观看足球赛。 6. 保持。其后常接复合宾语,表示使(某人或某物)保持某种状态或使某一动作继续。 ①keep + sb/sth + 介词。如:

(完整版)被动语态的几种特殊用法

被动语态的几种特殊用法 (1)主动形式表示被动意义 1)常见的这类动词有:“act,add up,clean,compare,count,cook,draw,fill,iron,keep,let,look,make up,milk,kill,open,photograph,prove,read,sell,smoke,spoil”等。 The window won’t open.(这扇窗户打不开。) The cow milks well.(这头牛出奶率很高。) Damp wood will not fire.(湿木不易燃烧。) She doesn’t photograph well.(她不上相。) His judgment proved wrong.(他的判断是错的。) The banana peels easily.(香蕉皮剥起来很容易。) Flies kill easily in autumn.(秋天苍蝇容易死亡。) It turned out fine that day.(结果那天天气很好。) How did his coat catch on a nail? (他的衣服怎么钩到钉子上了?) 2)实用动词“need/want/deserve/require +V-ing(动名词)”形式表示被动意义。 My hair needs cutting。. The bike wants repairing. It doesn’t deserve mentioning. Hamlet is required reading for the course.(《哈姆雷特》为本课程指定读物。) 3)一些固定句型如:"be worth doing sth.have/get sth.(sb.)done",以及to be under(in)+抽象名词等表示被动意义: Beijing is a big city in China and worth visiting.(北京是中国的一个大城市,值得浏览。) Mr..Wilson had his wallet stolen the day before yesterday.(威尔逊先生前天丢了一个钱包)。 The bike is under(in)repair.(自行车正在修理中。) This tape recorder is in use.(这种录音机正在使用中。) 4)一些不定式的主动态表示被动意义: ①There be句型: There are a lot of things to do. There is nothing to worry about. ②不定式修饰want, have等动词的宾语,而句中的主语同时又不是不定式的逻辑主语时: I want some clothes to wash.

中考英语keep用法归纳

Keep用法归纳 在人教版初中英语教材中,keep是要求学生必须掌握的四会词之一,现将其多见用法归纳小结如下,以利于大家正确地使用该词。 一、用作及物动词 1.意为“保存;保留;保持;保守“。如: Could you keep these letters for me, please?你能替我保存这些信吗? I“ll keep a seat for you.我给你留个座位。 It can help to keep vegetables, fruit and meat for a long time in hot summer.在炎夏的夏天,它有助于蔬菜、水果和肉类长时间保鲜。 Can you keep a secret?你能保守秘密吗? 2.意为“照顾;养活“等。如: She kept her sister for a week while her sister was ill.她妹妹有病时,她照看她了一个星期。 I have a family to keep.我得养活一家人。 3.意为“留下;不必还“。如: You can keep the pen if you like it.你要是喜欢就把钢笔留下吧。 Keep the change.不用找零钱了。 4.意为“遵守;维护“。如: Everyone must keep the rules.人人必须遵守规章制度。 The teacher is keeping order in class.老师正在课堂上维持秩序。 5.意为“售;卖“。如: The shop keeps everything you need.那家商店里出售的东西应有尽有。

高考英语before 的一个特殊用法

高考英语before 的一个特殊用法 邢丽芳 经过多年的高三教学,我觉得before 这个词的用法让很多学生都感到棘手,通过试题评讲,我从中收集了不少关于before的例句,在此我给同学们作个总结: 1. 之前 Tom’s father had died before he came back. 在汤姆回来之前,他父亲就已经死了。 2. 之后(才) It will be many years before the chemicals start to escape from the containers . (SEFCIIIA)要过很多年之后,这些化学物品才开始从容器中流出来。 3. 不等……就 Someone called me up in the middle of the night , but he hung before I could answer the phone. (NMET 2000) 半夜有人给我打电话,但还没等我去接,对方就挂断了。 在以上这些意思中,我着重讲讲第2个意思: 一. 在时态上 主句的时态可以是将来时,也可以是过去时,但从句的时态,要么是一般现在时,要么是一般过去时,根据具体情况而定。 It will be 2 years before we graduate from the middle school. 两年之后,我们才中学毕业。 It was long before he began to do his homework. 过了很长时间,他才开始做作业。 二. 在句式上 主句不仅有肯定式,也可有否定式。肯定结构意义为:过多久才,需要多久才;否定结构意义为:不久就…… It was long before they finished their task. 过了很长时间,他们才完成任务。 It wasn’t long before the people took up their arms. 不久,人民就开始拿起了武器。 三. 在用词上 在句型“…long before ”中,long也可换成hours , day , weeks , some time 等。 It will be hours before he arrives. 要过好几个小时他才会到。 It will be 2 weeks before we meet again. 两个星期后我们还会再次见面。 It will be some time before we know the full result. 还要过一些时间我们才能知道全部结果。 四. 在句型对比上 before 的这一用法与since等词用法很容易混淆,值得注意。 1. It has been 5 years _______ my sister returned from abroad. 2. It is 5 years ago _____ my sister returned from abroad. 3. It was the years 1990 _______ my sister returned from abroad. 4. It will be 5 years _______ my sister returns from abroad. A. before B. since C. that D. when

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:

keep用法

?keep at 1.坚持做…:继续某项工作或行为 ?keep down 1.压制,镇压:阻止…成长、完成或成功 Keep down prices; keep the revolutionaries down. 控制物价;镇压革命 ?keep off 躲开,避开 ?keep to 1.坚持,信守Keep to the original purpose.遵守原定宗旨 ?keep up 1.保持良好状态Kept up the property保存财产 2.保持;继续We asked her to stop talking, but she kept up. 我们请她别再说话了,但她依旧说下去 3.并行:按相同的水平或步伐继续下去 4.不落后,赶得上:赶上对手、同事或邻居,指在成就或生活方式上 Unsuccessfully tried to keep up with his associates.没能赶上他的同事们 ?you can't keep a good man (或woman) down (非正式)有能力的人是不会被挫折或问题吓倒 ?keep one's feet 站稳,不倒 ?keep goal (主英足)守球门 ?keep going (困难时)努力维持正常生活 ?keep open house 好客 ?keep to oneself 避开与人接触,独处 ?keep something to oneself 守口如瓶 ?keep up with the Joneses 与人攀比 ?keep wicket (板球)守板球门 ?keep someone after (美)(作为对小学生的惩罚)放学后留校

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。

the比较级…,the比较级…”的用法

“the more…,the more…”的用法 (1)“the more…,the more…”句型为“the+形容词或副词比较级,the+比较级”结构,常表示“越……,就越……”,是一个复合句,其中前面的句子是状语从句,后面的句子是主句。 The more he gets,the more he wants.他越来越贪(他得到的越多,就越想要)。 The more she learns, the more she wants to learn.她越学就越想学。 (2)“the+比较级,the+比较级”句型主从句的时态常用一般现在时或 一般过去时。 The higher the ground is, the thinner the air becomes.离地面越高,空气就越稀薄。 The harder he worked, the more he got.他工作越努力,得到的就越多。 (3)若主句的谓语动词用一般将来时,从句的谓语动词要用一般现在时表示将来。 The harder you work, the greater progress you will make.你越用功,进步就越大。 The longer the war lasts, the more the people there will suffer.战 争持续越久,那里的人们受难就越多。 (4)在这种句型中,主句在程度上随着从句变化而变化,常把被强调的部分提前。

The faster you run, the better it will be. 你跑得越快越好。 (5)这种句型的特点是前后都可以有所省略,特别是谚语、俗语,只要意义明确,越简单越好。 The more, the better. 多多益善。 The sooner, the better. 越早越好。 (6)这种句型中的比较部分通常是状语、宾语、表语,也可以是主语。The more English you practice, the better your English is. 你练习英语越多,你的英语就越好。 The busier he is, the happier he feels. 他越忙越高兴。 The more air there is inside the tyre, the greater the pressure there is in it. 轮胎里空气越多,里面的压力就越大。 (7)若表示“越……,越不……”,常用“the more…,the less…”句型。 The more she flatters me, the less Ilike her.她越逢迎我,我越不喜欢她。 (8)若表示“越不……,就越……”,常用“the less…,the more…”句型。The less he worried, the better he worked. 他越不烦恼,工作就干得越 好。

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