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However, but, yet , while

However, but, yet , while

连词while考点知识归纳

连词while考点知识归纳 while是大家比较熟悉的一个词,但是许多人对它的了解是不全面的,你可能只知道它表示“当……的时候”,甚至可能还知道它与when, as的用法区别。但是,非常遗憾,你所知道的这些东西都是有关while用法的“基础知识”,却不是一般英语考试的“考点知识”。请看下面两道考题: 1. _________ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it. A. If B. While C. Because D. As 2. In some places women are expected to earn money _________ men work at home and raise their children. A. but B. while C. because D. though 这两道题的答案均为B,即均选while。你知道这是为什么吗?下面我们就来归纳一下连词while的“考点知识”。 考点知识一:表示让步,意为“尽管”“虽然”。如: While the work was difficult, it was interesting. 虽然工作有难度,但很有趣。 While we don’t agree we continue to be friends.尽管我们意见不同,我们还是朋友。 While he admitted that he had received the stolen jewellery, he denied having taken part in the robbery. 尽管他承认他收受了盗窃的珠宝,但他否认参与了抢劫案。 While I did well in class, I was a poor performer at games. 虽说我学习不错,我运动却不行。While a few became richer, many did not. 虽然一些人变得更富有了,但多数人并非如此。 考点知识二:表示对比或转折,意为“而”“但是”。如: I went swimming while the others played tennis. 我去游泳,而其余的人则去打网球了。 Air is a fluid but not a liquid, while water is both a fluid and a liquid. 空气是流体不是液体,水是流体也是液体。 Some people waste food while others haven’t enough.一些人糟踏食物而另一些人却食不果腹。注:这样用时,while引出的句子通常位于末,但有时也可位于句首。如: While most children learn to read easily, some need extra help. 大多数儿童学会阅读很容易,有一些儿童却需要特别帮助。 While some languages have 30 or more different vowel sounds, others have five or less. 有些语言有30个或更多的元音,而其他语言只有5个或更少的元音。 现在我们回过头来分析一下上面的两道题:第1题中的while表示让步,全句意为:虽然因特网很有帮助,但我还是认为在其上花太多的时间不是个好主意。第2题中的while表示对比,全句意为:有些地方妇女挣钱,而男子则在家里持家和带孩子。

when和while区别及专项练习---含答案

when和while用法区别专项练习 讲解三例句: 1. The girls are dancing while the boys are singing. 2. Kangkang’s mother is cooking when he gets home. 3. When/While Kangkang’s mother is cooking, he gets home. 一、用when或者while填空 Margo was talking on the phone, her sister walked in. we visited the school, the children were playing games. · Sarah was at the barber’s, I was going to class. I saw Carlos, he was wearing a green shirt. Allen was cleaning his room, the phone rang. Rita bought her new dog; it was wearing a little coat. 7. He was driving along ________ suddenly a woman appeared. 8. _____ Jake was waiting at the door, an old woman called to him. 9. He was reading a book ______suddenly the telephone rang. 10. ______ it began to rain, they were playing chess. [ 二、用所给动词适当形式填空 11. While Jake __________ (look) for customers, he _______ (see) a woman. 12. They __________ (play) football on the playground when it _____ (begin) to rain. 13. A strange box ________ (arrive) while we _________ (talk). 14. John ____________ (sleep) when someone __________ (steal) his car. 15. Father still (sleep) when I (get) up yesterday morning. 16. Grandma (cook) breakfast while I (wash) my face this morning. 17. Mother (sweep) the floor when I (leave) home. ~ 18. I (read) a history book when someone (knock ) at the door. 19. Mary and Alice are busy (do) their homework. 20. The teacher asked us (keep) the windows closed. 21. I followed it (see) where it was going. 22. The students (play) basketball on the playground from 3 to 4 yesterday afternoon. / 三、完成下面句子,词数不限 1.飞机在伦敦起飞时正在下雨。 It when the plane in London. 2.你记得汶川大地震时你在做什么吗 Do you remember what you when Wenchuan Earthquake . 3.当铃声想起的时候,我们正在操场上玩得很开心。 We on the playground when the bell . 4.当妈妈下班回家时,你在做什么 % when Mum from work 5.当我在做作业时,有人敲门。 I was doing my homework, someone

while的用法

While用法小结 一、while作名词用,表示"一会儿""一段时间" 1.She likes to lie down for a while after lunch. 她喜欢午饭后躺一会儿。 2.Coming to another country to study requires a big adjustment and it takes a while to fit in. 来到另一个国家求学,需要花一段时间来适应。 二、While作连词 (1)引导时间状语 1.We must strike while the iron is hot. 趁热打铁。 2.While she was listening to the radio,she fell asleep. 她听着收音机睡着了。 (2) 引起让步状语从句,意思是"虽然…但是…."、"尽管…但是…"(多放于句首) 1.While he loves his students,he is very strict with them.. 虽然他爱他的学生,可是他对他们很严格。 2.While these experiments are interesting and useful,it is important to remember that they may not always tell us much. 虽然这些实验很有趣也有用,但是很重要的是要记住,这些实验也可能不会告诉你很多。 (3)引起条件状语,意思是"只要" 1.While there is life there is hope.只要生命存在,就有希望。 2.While there is a way there is away. 有志者事竟成。 三、While作并列连词用,意思为"而,然而",表对比。而but表转折。注意用心比较体会while与but的句中用意 1.Some people waste food while others haven't enough. 有些人很费粮食,然而有些人却吃不饱。 2.The son was having a good meal at home,while the parents were working in the fields. 儿子在家吃好饭而父母却在田里辛勤劳作。 3.I ought to have helped her,but I never could. 我本该帮她但没能。 4.Honey is sweet,but the bee stings. 蜂蜜很甜,但蜜蜂有刺蜇人。 四.while,when,as的用法区别

循环结构(While_Do循环)

四. While循环 1.While循环的格式: While <条件表达式> 循环体 Wend 说明:<条件表达式>为关系或逻辑表达式。 2.执行过程:判断条件;条件满足,执行循环体语句;再继续判断条件,继续执行循环; 直到条件不满足,结束循环。 结合下面我们熟悉的For程序,来说明: For I = 1 To 10 S = S + I Next I Print I 改用While循环表示: I = 1 ‘初值 While I<=10 ‘循环条件 S=S+I I=I+1 ‘变量自增,加步长 Wend Print S 3.While循环的说明 For循环语句必须给出初值、终值、步长值;循环条件也就给出了。 While循环语句中只给出循环条件和终值,所以一定要注意给出初值和增量。如上面程序段中的3处颜色部分语句。 例如:以下程序段循环几次,y值结果如何。 y = 2 While y < = 8 y = y + y Wend Print y 分析: 循环条件:y<=8 执行过程如下: Y=2,y<=8 满足,执行语句:y = y + y,y=4;遇到Wend返回继续判断条件。 Y=4,y<=8 满足,执行语句:y = y + y,y=8;遇到Wend返回继续判断条件。 Y=8,y<=8 满足,执行语句:y = y + y ,y=16;遇到Wend返回继续判断条件。 Y=16,y<=8 不满足,结束循环。 循环执行了3次。

五.Do循环 Do循环是在While循环基础上做了一点修改。整个格式结构和执行过程基本一样。 但增加了一种格式:条件不满足就循环,满足就结束循环。 格式1:Do While (条件) 循环体 Loop I=1 Do While I<4 S=S+1 I=I+1 Loop Print S I=1 Do Until I>=40 S=S+1 I=I+1 Loop 格式2:Do 循环体 Loop While (条件) 说明:格式1、格式2和While基本一样,格式2不同在于先执行一次循环,再判断条件是否满足。 格式3:Do Until(条件) 循环体 Loop 格式4:Do 循环体 Loop Until(条件) 说明:Until和While的不同在于条件不满足才循环。 注意:为了避免循环条件的混淆,我们一般是将Until 循环转换为While 循环做题。即将Until改为While,后面的条件改取相反值条件。

when和while的区别是

Period____8______ in Unit ___6_________ (Period_____20_____Week 4-6)Subject _Grammar (B) Teaching aims To use the Past Continuous Tense with while and when correctly Teaching interesting points of this class: The differences of when and while in Past Continuous Tense Teaching steps: I. Cooperation and intercourse 1. Check the preparation 2. Discuss in groups II. Question and explanation Check the exercises on page 101, and explain the differences between when and while. when和while的区别是: when只能用于一般时态 while可以用于进行时态 when conj. 在...的时候, 当…的时候 when 在绝大多数情况下,所引导的从句中,应该使用非延续性动词(也叫瞬间动词) 例如:I'll call you when I get there. 我一到那里就给你打电话 I was about to go out when the telephone rang.我刚要出门,电话铃就响了。 但是,when 却可以be 连用。 例如:I lived in this village when I was a boy. 当我还是个孩子的时候我住在这个村庄里。 When I was young, I was sick all the time. 在我小时候我总是生病 while 当...的时候 While he was eating, I asked him to lend me $2. 当他正在吃饭时,我请他借给我二美元。While I read, she sang. 我看书时,她在唱歌。 while 的这种用法一般都和延续性动词连用 while 可以表示“对比‘,这样用有的语法书认为是并列连词 Some people like coffee, while others like tea. 有些人喜欢咖啡, 而有些人喜欢茶。 as 当...之时,一边......一边....... I slipped on the ice as I ran home. 我跑回家时在冰上滑了一跤 He dropped the glass as he stood up. 他站起来时,把杯子摔了。 She sang As she worked. 她一边工作一边唱歌。 III. Rumination and evaluation when, as, while这三个词都可以引出时间状语从句,它们的差别是:when 从句表示某时刻或一段时间as 从句表示进展过程,while 只表示一段时间 When he left the house, I was sitting in the garden. 当他离开家时,我正在院子里坐着。 When he arrived home, it was just nine o'clock.

WHEN与WHILE用法区别

WHEN与WHILE用法区别 when, while这三个词都有"当……时候"之意,但用法有所不同,使用时要特别注意。 ①when意为"在……时刻或时期",它可兼指"时间点"与"时间段",所引导的从句的动词既可以是终止性动词,也可是持续性动词。如: When I got home, he was having supper.我到家时,他正在吃饭。 When I was young, I liked dancing.我年轻时喜欢跳舞。 ②while只指"时间段",不指"时间点",从句的动词只限于持续性动词。如:While I slept, a thief broke in.在我睡觉时,盗贼闯了进来。 辨析 ①when从句与主句动作先后发生时,不能与while互换。如: When he has finished his work, he takes a short rest.每当他做完工作后,总要稍稍休息一下。(when = after) When I got to the cinema, the film had already begun.当我到电影院时,电影已经开始了。(when=before) ②when从句动词为终止性动词时,不能由while替换。如: When he came yesterday, we were playing basketball.昨天他来时,我们正在打篮球。 ③当从句的谓语是表动作的延续性动词时,when, while才有可能互相替代。如:While / When we were still laughing, the teacher came in.正当我们仍在大声嬉笑时,老师进来了。 ④当从句的谓语动词是终止性动词,而且主句的谓语动词也是终止性动词 时,when可和as通用,而且用as比用when在时间上更为紧凑,有"正当这时"的含义。如: He came just as (or when) I reached the door.我刚到门那儿,他就来了。 ⑤从句的谓语动词如表示状态时,通常用while。如: We must strike while the iron is hot.我们应该趁热打铁。 ⑥while和when都可以用作并列连词。

however的用法

With the possible exception of the Beatles, no other band has become so successful so quickly. 可能除了披头士乐队这个例外,还没有哪个乐队如此转瞬走红的。 并列句中连接词语的功能 2006-03-01 18:54:21 ??英语中,包含两个或两个以上互不依从的主谓结构的句子称为并列句,各个相互独立的主谓结构叫作分句,多数情况下并列句中的分句由并列连接词来连接。并列句的分句之间关系密切,而并列连接词是分句之间关系的纽带,它们起着承上启下的作用,显示了分句之间逻辑关系,指示了说话人思维的走向。因此,正确理解和掌握连接词语是我们能否正确理解话语篇章意义的关键。表示并列关系的词语除了并列连词(如:and,but,or,so,for等),还有并列词组(如:in addition,as a result 等)和连接性副词(如:however,moreover,otherwise等),这里统称为连接词语。根据连接词语的语义功能,可将其分类如下: 1.表示补充、添加关系的连接词 这类连接词表示后面分句的句意是对前面分句句意的补充,说的是同类事情。常用的有:and,in addition,besides,moreover,furthermore,likewise,in the same way,what’s more 等。例如: Irene did not answer,and James,too,ceased speaking. 艾琳没有回答,詹姆斯也不再说话。(说的都是"保持沉默") Bicycling is good exercise,moreover,it doesn’t pollute the air. 骑自行车是项很好的运动,而且又不污染空气。(说的都是骑自行车的优点) A flood will break a dam;likewise, the oppressed people everywhere will overthrow their oppressors in the end. 洪水会冲毁大坝,同样,任何地方的被压迫人民也会推翻他们的压迫者。(说的是同一道理) 2.表示转折关系的连接词 这类连接词表示后面分句在意义上与前面的分句发生了转折,说的是不同情况或不同的观点。常见的有:but,however,nevertheless,instead,on the contrary,on the otherhand,yet,by contrast,whereas等。例如: The situation looked desperate,but they didn’t give up hope. 形势看来非常危急,但他们没有放弃希望。 It’s too wet to go for a walk;let’s go swimming instead. 天气潮湿,不宜去散步,我们改去游泳吧。 There was no news;nevertheless,she went on hoping. 尽管没有消息,她仍抱着希望。 3.表示因果关系的连接词

英语中连词while的用法归纳

英语中连词while的用法归纳 连词while除具有“当时”、“同时”等意义外,根据上下文还有以下不同含义及其不同译法。 一、引导时间状语从句 译作“当……时”。例如: 1. Make hay while the sun shines. 趁着有太阳晒晒草。 (乘机行事,抓紧时机。) 2. We must work hard to gain more knowledge while we are young. 趁着现在还年轻,我们必须刻苦学习,获得更多的知识。 二、引导让步状语从句 常放在句首,译作“尽管”、“虽然”,比although或though语气要轻。例如: 1. While I believe it is true, I cannot prove it. 虽然我相信那是真的,但我无法证明。 2. While any kind of athletic shoe can provide a certain amount of r ebound, energy-return sneakers are designed to maximize this effect. 虽然任何一种运动鞋都能提供一定的反弹力,但回力运动鞋能够使这种效果最大化。 三、引导条件状语从句 相当于as long as,译作“只要”。例如: 1. While there is life, there is hope. 有生命,就有希望。 2. While a spark of life remains, it is a doctor's duty to save the pat ient.

只要病人还有一息生机,医生就有责任挽救。 四、引导原因状语从句 相当于since,有“既然”的意思。例如: 1. You'll never save any money while you're so extravagant. 你这么奢侈,永远存不下钱来。 2. I'd like to get it settled today while we're at it. 既然我们着手干了,我想今天就把它干完。 五、连接并列句 表示对比,相当于whereas,译作“而”、“可是”。例如: 1. An outdoors man will soon become pale if he changes to an indo or job, while a desk clerk will take on a tan after a short vacation in the sun. 从事室外工作的人如果调到室内工作,不久肤色就会变白;而一个伏案工作的文员出去度个短假,就会被太阳变黑。 2. Motion is absolute while stagnation is relative. 运动是绝对的,而静止是相对的。 六、连接并列句 表示递进,相当于and what is more, 译作“并且”、“而且”。例如: 1. The new man-made fibres are more hardwearing than natural fibres and greatly reduce mending, while good ready-made clothes are cheap and pl entiful. 新的人造纤维比天然纤维耐磨,因此能大大减少修补工作,而且做好的衣服价廉物美,数量也多。 2. Of course, I resolutely determined not to marry, while I quite forg ot to consider at all that great rock of disaster in the working-class world-- sic kness. 当然, 我下定决心不结婚,而且把工人阶级的巨大灾难——疾病,也忘得一干二净。

while、when和as的用法区别

as when while 的区别和用法 as when while的用法 一、as的意思是“正当……时候”,它既可表示一个具体的时间点,也可以表示一段时间。as可表示主句和从句的动作同时发生或同时持续,即“点点重合”“线线重合”;又可表示一个动作发生在另一个动作的持续过程中,即“点线重合”, 但不能表示两个动作一前一后发生。如果主句和从句的谓语动词都表示持续性的动作,二者均可用进行时,也可以一个用进行时,一个用一般时或者都用一般时。 1、As I got on the bus,he got off. 我上车,他下车。(点点重合)两个动作都是非延续性的 2、He was writing as I was reading. 我看书时,他在写字。(线线重合)两个动作都是延续性的 3、The students were talking as the teacher came in. 老师进来时,学生们正在讲话。(点线重合)前一个动作是延续性的,而后一个动作时非延续性的 二、while的意思是“在……同时(at the same time that )”“在……期间(for as long as, during the time that)”。从while的本身词义来看,它只能表示一段时间,不能表示具体的时间点。在时间上可以是“线线重合”或“点线重合”,但不能表示“点点重合”。例如: 1、He was watching TV while she was cooking. 她做饭时,他在看电视。(线线重合) 2、He was waiting for me while I was working. 我工作的时候,他正等着我。(线线重合) 3、He asked me a question while I was speaking. 我在讲话时,他问了我一个问题。(点线重合)

过去进行时、when和while引导时 间状语从句的区别

过去进行时过去进行时表示过去某一时刻或者某段时间正在进行或发生的动作,常和表过去的时间状语连用,如: 1. I was doing my homework at this time yesterday. 昨天的这个时候我正在做作业。 2. They were waiting for you yesterday. 他们昨天一直在等你。 3. He was cooking in the kitchen at 12 o'clock yesterday. 昨天12点,他正在厨房烧饭。 过去进行时的构成: 肯定形式:主语+was/were+V-ing 否定形式:主语+was not (wasn't)/were not (weren't)+V-ing 疑问形式:Was/Were+主语+V-ing。 基本用法: 1. 过去进行时表示过去某一段时间或某一时刻正在进行的动作。常与之连用的时间状语有,at that time/moment, (at) this time yesterday (last night/Sunday/week…), at+点钟+yesterday (last night / Sunday…),when sb. did sth.等时间状语从句,如: 1)What were you doing at 7p.m. yesterday? 昨天晚上七点你在干什么? 2)I first met Mary three years ago. She was working at a radio shop at the time. 我第一次遇到玛丽是在三年前,当时她在一家无线电商店工作。 3)I was cooking when she knocked at the door. 她敲门时我正在做饭。 2. when后通常用表示暂短性动词,while后通常用表示持续性动词,而while所引导的状语从句中,谓语动词常用进行时态,如: When the car exploded I was walking past it. = While I was walking past the car it exploded. 3. when用作并列连词时,主句常用进行时态,从句则用一般过去时,表示主句动作发生的过程中,另一个意想不到的动作发生了。如: I was walking in the street when someone called me. 我正在街上走时突然有人喊我。 4. when作并列连词,表示“(这时)突然”之意时,第一个并列分句用过去进行时,when引导的并列分句用一般过去时。如:

While的用法

While的用法 一、while用作名词时,意为“一段时间,一会儿”。例如: I stayed there for a short while.(我在那儿呆了一小会儿。) The postman came a short while ago.(邮递员刚刚来过。) 二、while用作连词时,有以下几种含义: 1、意为“当……时候,和……同时”,引导时间状语从句。例如: While I was watching TV,the bell rang.我看电视时,铃响了。) Tom watched TV while she ate her supper.(汤姆边吃晚饭边看电视。) 2、意为“虽然,尽管”,引导让步状语从句。例如: While it was late,he went on working.(虽然很晚了,但他还在继续工作。) While he is in poor health,he works hard.(虽然他身体不好,但他还是努力工作。) 3、连接两个并列句子,表示“对比”关系。例如: He went out for a walk,while I stayed at home.(他出去散步了,而我却呆在家里。) I like singing while she likes dancing.(我喜欢唱歌,而她喜欢跳舞。) You like sports,while I prefer music.(你喜欢体育,而我更喜欢音乐。) 三、while引导状语从句时,应注意以下几点: 1、while引导的时间状语从句既可放在句首,也可放在句末;而while引导的让步状语从句一般放在句首,不放在句末。另外,也可以从意义上加以区分。例如:While he was tired,he went on working.(虽然他累了,但他还是继续工作。) (while引导让步状语从句) While he was tired,he would have a rest.(他累了就休息一会儿。) (while引导时间状语从句) 2、while引导让步状语从句时,如果从句的主语和主句的主语相同,那么从句的主语和谓语动词be都可以省略。例如: While he was ill,he went there.(=While ill,he went there.) (虽然他有病,但他还是去那里了。) 3、while和when都可以引导时间状语从句,但应注意:while引导的时间状语从句中的谓语动词必须是延续性的动词;而when引导的时间状语从句中的谓语动词既可以是延续性动词,也可以是非延续性动词。当时间状语从句中的谓语动词是延续性动

when和while区别资料讲解

w h e n和w h i l e区别

0when和while的区别 ①when是at or during the time that, 既指时间点,也可指一段时间; while是during the time that,只指一段时间,因此when引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。 ②when 说明从句的动作和主句的动作可以是同时,也可以是先后发生;while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。 ③由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时;如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,如: a. When the teacher came in, we were talking. 当此句改变主从句的位置时,则为: While we were talking, the teacher came in. b. They were singing while we were dancing. ④when和while 还可作并列连词。when表示“在那时”;while表示“而,却”,表对照关系。如: a. The children were running to move the bag of rice when they heard the sound of a motor bike.

孩子们正要跑过去搬开那袋米,这时他们听到了摩托车的声音。 b. He is strong while his brother is weak. 他长得很结实,而他弟弟却很瘦弱。 具体你可以参考这一段。 when,while,as引导时间状语从句的区别 when,while,as显然都可以引导时间状语从句,但用法区别非常大。 一、when可以和延续性动词连用,也可以和短暂性动词连用;而while和as只能和延续性动词连用。 ① Why do you want a new job when youve got such a good one already?(get为短暂性动词)你已经找到如此好的工作,为何还想再找新的? ②Sorry,I was out when you called me.(call为短暂性动词)对不起,你打电话时我刚好外出了。 ③Strike while the iron is hot.(is为延续性动词,表示一种持续的状态)趁热打铁。 ④ The students took notes as they listened.(listen为延续性动词)学生们边听课边做笔记。

it 做形式主语和however 用法

不管however以何种形式出现,它都不外乎以下两种用法。 1. 用作副词 (1) 表示让步:意为“无论如何”“不管怎样”,用来修饰形容词或副词, 其词序为:however+形容词或副词+主语+谓语。这样用的however其实具有连词的功能,用以引导让步状语从句。如: however much he eats, he never gets fat. 不管他吃多少,他永远吃不胖。 用于此用法时,请注意以下几点: ①此用法属however所有用法中最重要的考点,同学们务请引起高度重视。 ②这样用的 however 与 no matter how 大致同义。如: People always want more, however [no matter how] rich they are. 人总是富了还想再富。 however [No matter how] hard I worked, she was never satisfied. 无论我多么努力地工作,她从来没满意过。 ③有时从句谓语可用情态动词。如: Don’t laugh, however funny it may be. 无论多么有趣也不要笑。 I’ll try to finish it in time, however hard it may be. 无论多么难,我也要按时完成。 ④“however+形容词或副词+主语+谓语”有时可以有所省略。如: I refuse, however favorable the conditions. 不管条件如何有利,我都不干。(conditions 后省去了are) I’d rather have a room of my own, however small (it is), than share a room. 无论房间多么小,我宁愿一个人住一间,而不愿意与别人合住一个房间。 A grammar rule, however true (it is), is useless unless it can be understood. 一条语法规则,不管如何正确,除非能懂,否则毫无用处。 (2) 表示转折:尤其用于谈及一个既成事实时,表示转折,其意为“可是”“仍然”等。可放在句首、句中或句末,通常用逗号与句子其他成分隔开。如: My father, however, did not agree. 但是,我父亲不同意。 My room is small; however, it’s comfortable. 我的房间很小,但却很舒服。 He said that it was so; he was mistaken, however. 他说情况如此,可是他错了。注:however不能像 but(但是)那样直接连接两个句子(注意正句中的标点符号)。如: 我们都已尽了最大的努力,不过我们还是输了。. 正:We all tried our best, but we lost the game. 正:We all tried our best; however, we lost the game. 正:We all tried our best. however, we lost the game. (3) 表示惊奇或强调:相当于how ever的用法,其意为“究竟怎样,到底以什么方式”。如:however did you get here without a car? 没有汽车你究竟是怎样来的呢? No matter +疑问词或者疑问词-ever 含义为“无论……都, 不管……都”。他们引导让步状语从句,并且可以互换。

高考英语看连词-while-的用法

高考英语看连词-while-的用法 高中英语辅导:由高考题看连词while 的用法 1. -I am going to the office. -______you're there, can you get me some stamps? (NMET'99) A. As B. While C. Because D. If 2. She thought I was talking about her daughter, ______in fact, I was talking about my daughter. (NMET'95) A. whom B. where C. which D. while [析] 1题中的连词While表示"当……的时候",着重"在……期间";而2题中的连词while意为"而;然而",表示前后两种截然不同情况的对比。 连词while大致有以下四种用法: 1.引导时间状语从句,意为"当……的时候;和……同时",此时的主从句谓语动作同时发生,从句谓语通常是延续性动词。如: Mary watched TV while she ate her supper.玛丽边吃饭边看电视。 While she was listening to the radio, she fell asleep.她听着收音机睡着了。 while引导从句时,如主从句的主语一致,且从句谓语又含有be,则从句主语和be可省略。while后可直接跟现在分词、名词、形容词或介词短语。如: We are teachers while (we are) serving as students.我们边当老师边当学生。 While (he was) yet a youth, he gained many prizes.他年轻时就曾多次获奖。 He caught a cold while(he was) on vacation.他度假时患了感冒。 2.表示对比或转折,意为"而;然而"。此时,while一般位于句中。如: Some people waste food while others haven't enough.有些人浪费粮食,然而有些人却吃不饱。 You like sports, while I prefer music.你喜欢体育,而我更喜欢音乐。 1 / 2

when 和while的用法区别

when 和while的用法区别 ①when是at or during the time that, 既指时间点,也可指一段时间; while是during the time that,只指一段时间,因此when引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。 ②when 说明从句的动作和主句的动作可以是同时,也可以是先后发生;while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。 ③由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时;如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,如: a. When the teacher came in, we were talking. 当此句改变主从句的位置时,则为: While we were talking, the teacher came in. b. They were singing while we were dancing. ④when和while 还可作并列连词。when表示“在那时”;while表示“而,却”,表对照关系。如: a. The children were running to move the bag of rice when they heard the sound of a motor bike. 孩子们正要跑过去搬开那袋米,这时他们听到了摩托车的声音。 b. He is strong while his brother is weak. 他长得很结实,而他弟弟却很瘦弱。 when,while,as引导时间状语从句的区别 when,while,as显然都可以引导时间状语从句,但用法区别非常大。 一、when可以和延续性动词连用,也可以和短暂性动词连用;而while和as只能和延续性动词连用。 ①Why do you want a new job when youve got such a good one already?(get 为短暂性动词)你已经找到如此好的工作,为何还想再找新的? ②Sorry,I was out when you called me.(call为短暂性动词)对不起,你打电话时我刚好外出了。 ③Strike while the iron is hot.(is为延续性动词,表示一种持续的状态)趁热打铁。 ④The students took notes as they listened.(listen为延续性动词)学生们边听课边做笔记。 二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生;while和as从句的谓语动作必须是和主句谓语动作同时发生。 1.从句动作在主句动作前发生,只用when。 ①When he had finished his homework,he took a short rest.(finished先发生)当他完成作业后,他休息了一会儿。 ②When I got to the airport,the guests had left.(got to后发生)当我赶到飞机场时,客人们已经离开了。 2.从句动作和主句动作同时发生,且从句动作为延续性动词时,when,while,as都可使用。

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