When和While的区别(可编辑修改word版)

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before与ago、when,while,as区别

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”。

宾语从句while when

宾语从句while when

宾语从句while when在宾语从句中,"while" 和 "when" 都是引导时间状语从句的连词,但它们在用法上有一些区别。

"While" 表示“在......期间”,强调主句动作和从句动作同时进行,或者主句动作在从句动作的持续过程中发生。

例如:I was reading while my sister was watching TV.(我在读书,而我妹妹在看电视。

)这里的 "while" 表示两个动作同时进行。

"When" 表示“当......时候”,强调主句动作和从句动作的先后顺序,或者表示某个特定的时间点。

例如:I will tell her when she comes back.(她回来时,我会告诉她。

)这里的 "when" 表示从句动作发生后,主句动作才会发生。

需要注意的是,"while" 引导的从句通常使用进行时态,而 "when" 引导的从句可以使用各种时态。

另外,"while" 还可以表示对比或转折的关系,而 "when" 一般不具有这种用法。

例如:She likes music while I prefer sports.(她喜欢音乐,而我更喜欢运动。

)这里的 "while" 表示对比。

在使用宾语从句时,需要根据上下文和想要表达的意思来选择合适的连词。

同时,要注意从句的时态和语序,确保句子的逻辑和语法正确。

希望以上解释对你有所帮助!如果你还有其他关于宾语从句或者 "while" 和 "when" 的问题,欢迎继续提问。

when 与while的区别

when 与while的区别

when 与while的区别1. when指某个时间点,表示瞬间动作;while 指某个时间段,表示延续性动作。

如:用when引导的状语从句表示时间,说明一个动作发生的时候,另一个动作正在进行。

如:—What were you doing when I came into the classroom? 当我走进教室的时候你正在干什么?—I was reading. 我正在读书。

—What was he doing when I came in? 当我进来的时候他正在干什么?— He was watching TV.他正在看电视。

When I got there, she was playing the violin. 我到那里时,她正在拉小提琴。

用when引导的时间状语从句也可以表示某一个动作已发生,另一个动作已经完成,已经完成的主句的动作用过去完成时态来体现。

When they arrived at the station, the train had left.当他们到达车站的时候,火车已经离开了。

用while连接的时间状语从句一般用过去进行时,表示正在进行某一个动作时发生了另一个动作,而主句常用一般过去时。

While I was playing the violin, he came to see me.我正在拉小提琴时,他来看我了。

While he was reading, the telephone rang. 当他正在读书的时候,电话铃响了。

While we were boating on the lake, we saw a fish jump out of the water.当我们正在湖中划船时,我们看见了一条鱼跳出了水面。

注意:英语中,延续性动作是由延续性动词发出的,瞬间性动作是由非延续性动词发出的。

延续性动词和非延续性动词的区别:延续性动词是指该动作可以延续一段时间,而不是瞬间结束,如work(工作)、study(学习)、eat(吃)、watch(观看);非延续性动词是指该动作极为短暂,瞬间便会结束,如start(开始)、begin(开始)、hit(撞)、see(看见)、knock(敲)、jump(跳)。

英语人教版八年级下册when和while 的区别

英语人教版八年级下册when和while 的区别
While he was watching TV, I was reading the newspaper
Exercises
Fill with “While” or While “When ” talking on the phone, her sister 1.____ May was
walked in.
① I was walking to school when I saw a cat in a tree. ②When Sally arrived home, her mother was cleaning the house. 主句的动作是持续性的, 而从句的动作是短暂性的, 此时用when引导时间状语从句,主 句用过去进行时态,从句用一般过 去时态。
2.____ WhenRita bought her new dog, it was wearing a little coat.
When I saw Carlos, he was wearing a green 3._____ shirt. 4._____ While I was dancing, he was singing loudly.
When Linda finally saw Dave , he 5. _____ was jumping with a dog . when 6. I was cleaning my room ________ the fire broke out .
while 7.He was cleaning his car, _____ I was cooking. While Andy was waiting for the 8.____ bus, he was reading a newspaper.

【推荐下载】when, while, as区别详解-范文word版 (1页)

【推荐下载】when, while, as区别详解-范文word版 (1页)

【推荐下载】when, while, as区别详解-范文word版本文部分内容来自网络整理,本司不为其真实性负责,如有异议或侵权请及时联系,本司将立即删除!== 本文为word格式,下载后可方便编辑和修改! ==when, while, as区别详解when , while , as 区别详解一、根据从句动作的持续性来区分1. 主短从长型:即主句是一个短暂性的动作,而从句是一个持续性动作,此时三者都可用。

如:Jim hurt his arm while [ when , as ] he was playing tennis . 吉姆打网球时把手臂扭了。

As [ When , While ] she was waiting for the train , she became very impatient . 她在等火车时,变得很不耐烦。

注意: as 用于引出一个持续性动词表示在期间时,其谓语通常只能是那些含有动作和发展意味的动词,一般不能是那些不用于进行时态的动词,所以下面一句中的 while 不能换为 as :A : Im going to the post office . 我要去邮局。

B : While you are there , can you get me some stamps ? 当你在邮局时,能帮我买几张邮票吗?2. 主长从长型:即主句和从句为两个同时进行的动作或存在的状态,且强调主句动作或状态延续到从句所指的整个时间,此时通常要用 while 。

如:I always listen to the radio while Im driving . 我总是一边开车一边听收音机。

He didnt ask me in ; he kept me standing at the door while he read the message . 他没有让我进去,他只顾看那张条子,让我站在门口等着。

中考英语when和while的用法和区别

中考英语when和while的用法和区别

中考英语when和while的用法和区别when和while的区别一:when 当......之时(时间点),后接短暂性瞬间动词when在.....期间(时间段),后接延续性动词while在......期间(时间段),后接延续性动词因此,when可后接短暂性或延续性动词,而while只能接延续性动词。

后接短暂性终止性瞬间动词时,常用when,不用while;后接延续性动词时,when和while 常可替换使用;I was reading when you came in.当你进来的时候,我正在看书。

came是短暂性动词,此处when不能用while代替You came in while I was reading.= You came in when I was reading.read是延续性动词,此处when可用while代替when和while的区别二:1.表示正在做某事的期间,发生了意料之外的另一个短暂的动作,要对比这两件事,常用:主句(过去进行时-持续性动词),when从句(一般过去时-短暂性动词)We were playing games happily when we heard a cry.我们正在高兴地玩游戏的时候,(突然)听见了一声大叫。

2.若主句和从句的动作都比较长,表示同时发生,更常用while,此时可用进行时态或一般时态He waited in the car while l was in the shop.当我在店里的时候,他在车里等着。

He was watching TV while I was writing.当我在写作的时候,他正在看电视。

when和while的区别三:1.when可表示表示某个动作发生结束后紧接发生另一个动作,而while则不可When the bell rang, John went out of the classroom.铃声响后,约翰走出教室。

(完整word版)when和while用法小结

(完整word版)when和while用法小结

连词while的用法连词while的用法有好几种,使用时不可掉心轻心,它大数有以下几种用法:1、表示时间,意思是“当……的时候”,while可以位于句首,也可以位于句中。

我们在看电视时,她一个人在房间里读小说。

,the telephone rang . 他正在整理行装,电话铃响了。

,she fell asleep . 她听着收音机睡着了。

While引导从句时,如主句和从句的主语一致,从句的谓语又含有be,那么从句的主语和be可省略,While 后可直接跟现在分词、名词、形容词或介词短语。

a. We are students while ( we are ) serving as teachers. 我们一面当老师,一面当学生。

b. While (he was )yet a youth he gained many prices. 当他还是个青年时,他就多次获奖。

c. She never dreams 她睡着时从来不做梦。

d. Tom had an accident 在来这儿的途中,汤姆出了事故。

2、表示对比或转折,意思是“而”,这时,While一般位于句中,如:Kate was dressed in green while Jenny was dressed in red .凯特穿绿色衣服,而詹妮穿绿色衣服。

She likes singing and dancing while her brother would rather read novels …, 而她弟弟喜欢小说。

Young people are like the sun rising in the east while old people are like the sun setting in the west .年轻人犹如旭日东升,而老年人犹如日薄西山。

a. She though I was talking about her daughter , in fact , I was talking about my daughter .(NMET’95)A. whomB. whereC. whichD. whileb. I do every single bit of housework my husband Bob just does the dishes now and then .[04广西] A.since B.while C.when D.as3、表示让步,通常用在句首,意思是“尽管”、“虽然”,如:While he had a handsome income, h e couldn’t afford to buy a piano.他虽然收入不少,但卖不起钢琴。

when while 的区别和用法

when while 的区别和用法

when while 的区别和用法以《whenwhile区别和用法》为标题,写一篇3000字的中文文章When while英语语法中的关键词,它们可以用来表示时间的概念。

当谈论到这两个词的用法和区别时,很多人都有困惑。

它们的区别可以大致归结为两点:一是词性,另一个是时间关系。

本文将详细讨论它们的区别和用法。

首先,让我们来看看它们的词性区别。

when一个连词,用来引导时间状语从句,表示将来的动作或情况。

而 while是一个副词,意思是表示某2个动作或情况同时发生。

其次,它们有着不同的时间关系。

当表达“当…的时候”时,可以使用 when表达。

比如:When he came, we all welcomed him.他来的时候,我们都欢迎他。

而使用 while,可以表达“在…的时候”,比如:I was studying while he was playing.在学习的时候,他在玩耍。

在实际的运用中,when while时可以互换使用,但有时也不能。

当连接短语中含有主谓关系时,例如:I was reading when he came.正在读书的时候,他来了,这时候就不能用 while替换 when 了,因为连接短语中有动作发生者,使用 while 会引起语法上的问题。

此外,两个词也可以互换用在状语从句中,当从句中有时间动词 be词时比较适合使用 while,比如:I was in the classroomwhile he was in the office.在课室的时候,他在办公室。

而在从句中也可以使用 when,但当 while以表达出主句和从句之间正在同时发生的活动,那么他们就可以可以互换使用了。

比如:He was eating while I was talking. 他在吃饭的时候,我在说话,这时候可以把while成 when。

最后,当使用 when While,具体的意思取决于上下文,使用者需要根据句子的意思来选择合适的词,而不是视情况而定。

When和while的区别

When和while的区别

When while 的区别和用法(1) 若主句表示的是一个短暂性动作,从句表示的是一个持续性动作,二者都可用:He fell asleep when |while he was reading. 他看书时睡着了。

(2) 若主、从句表示两个同时进行的持续性动作,且强调主句表示的动作延续到从句所指的整个时间,通常要用 while:Don’t talk while you’re eating. 吃饭时不要说话。

I kept silent while he was writing. 在他写的时候,我默不做声。

(3) 若从句是一个短暂性动作,主句是一个持续性动作,可用when但不用 while:It was raining hard when we arrived.我们到达时正下着大雨。

(4) 若主从句表示的是两个同时(或几乎同时)发生的短暂性动作,用 when:I thought of it just when you opened your mouth. 就在你要说的时候,我也想到了。

(5) 表示“每当…的时候”(暗示一种规律性),一般要用when:It’s cold when it snows. 下雪时天冷。

He smiles when you praise him. 你夸奖他时他总是笑笑。

(6) 若主从句所表示的动作不是同时发生,而是有先后顺序时,一般要用when:I will go home when he comes back. 他回来时,我就回家去。

(7) when可用作并列连词,表示“这时(突然)”;while也可以用作并列连词,表示“而”、“却”(表示对比)We were about to start when it began to rain. 我们正要出发,这时天开始下雨了。

He likes coffee, while she likes tea. 他喜欢咖啡,而她却喜欢茶。

when-和while的用法区别

when-和while的用法区别
when的胃口大,while的胃口小
意思是,when 既可以跟终止性动词,又可以跟延续性动词.而while只能跟延续性动词(一般是进行时)
Eg:Iwas doing my homework when Tom called me。call 是短暂性的动作,所以不能用while
I was washing the dishes while/when Lily was cooking.cook是延续性的,所以when和while都行。这就是为什么,when的胃口大,while 的胃口小
when和while的区别
①when可以和时间点,一段时间连用;
While和一段时间连用
when可以和终止性动词,或延续性动词连用
while只能和延续性动词连用
终止性动词:come ,go ,close ,open ,die ,stop,see,hear,finish,leave,borrow,lend,move fall,start,sit,call
②when主从句的动作可以是同时或先后发生;
while则强调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,从句用一般过去时;while的从句和主句的动作同时发生,两句都用过去进行时
a.Whenthe teachercamein, wewere talking dancing。
④when和while 还可作并列连词.when表示“正在那时”;
while表示“而,却”,表对照或转折。Eg:The childrenwere runningto move the bag of ricewhentheyheardthe sound of a motor bike.
Eg:He is strongwhilehis brother is weak。

when 和while的用法区别

when 和while的用法区别

when 和while的用法区别when和while是英语中两个常见的连词,它们在句子中的使用有一些区别。

下面就来详细介绍一下它们的用法区别。

一、时间状语从句中的用法:1. when:表示“当……的时候”,引导的时间状语从句中的动作与主句的动作同时或几乎同时发生。

例句:I always feel sleepy when I listen to classical music.(当我听古典音乐的时候,我总是感到困倦。

)2. while:表示“在……的时候”,引导的时间状语从句中的动作与主句的动作同时发生,但强调主句的动作持续时间较长。

例句:She watched a movie while her brother was studying. (她在她哥哥学习的时候看电影。

)二、连词的不同含义:1. when:除了表示时间状语从句外,还可以表示“当……的时候”、“每当”等含义。

例句:When it rains, I always stay at home.(每当下雨,我总是待在家里。

)2. while:除了表示时间状语从句外,还可以表示对比、让步、转折等含义。

例句:While I appreciate your effort, I still think you need to improve.(虽然我赞赏你的努力,但我仍然认为你需要进步。

)三、连词引导的句子结构:1. when:可以引导的从句有主语+谓语或名词性从句。

例句:When she arrived, everyone applauded.(当她到达时,大家鼓掌。

)例句:I don't know when he will come back.(我不知道他何时会回来。

)2. while:除了可以引导主语+谓语的从句外,还可以引导状语从句和让步从句。

例句:While I was reading, the phone rang.(我在看书的时候,电话响了。

图表与口诀记忆when、as、while的区别

图表与口诀记忆when、as、while的区别

图表与口诀记忆when、as、while的区别1.图表与口诀前知识关键是比较主从句子的动词,看其动词的持续性。

瞬间的理解成点,持续的理解成线。

主从关系有:点(点点、点线),线线,线点。

点:为瞬间动词,准确地称为“终止性动词”,指动词具有某种内在界限的含义,一旦达到这个界限,该动作就完成了。

如come(来),一旦“到来”,该动作就不再继续下去了。

瞬间动词:arrive, begin, borrow, become, buy, catch, come, die, find, go,give, graduate, join, kill, lose, leave, marry, realize…线:为非瞬间动词,准确地称为叫“延续性动词”。

包括动态动词静态动词。

动态动词:live, sit, stand, study, talk, work, write…静态动词(状态动词):情感、看法、愿望等。

Be, belong, consist, exist, feel, hate, have, hope, love, want…兼有瞬时和非瞬时的动词:feel,look,move,run,work,write…,需要根据不同的语境判断。

2. when、as、while的区别一览表【表格说明】:第一个点或者线表示从句谓语动词的持续性特征,黑点表示从句所表示的动作持续短,为瞬间动词,线表示持续长,为非瞬间动词。

1~7为主句与从句所表示的动作时间有重合,第8为主句与从句所表示的动作不是同时发生,而是有先后顺序。

序号点线关系图示说明连接词例句1从句为点“点点重合”或“点线重合”,不用考虑主句是“点”还是“线”;①同时(或几乎同时) “一…….就……”;whenasI thought of it just when [as] you openedyour mouth. 就在你要说的时候,我也想到了。

It was raining hard when [as] we arrived.我们到达时正下着大雨。

whenwhile区别顺口溜

whenwhile区别顺口溜

whenwhile区别顺口溜摘要:1.了解while和when的用法区别2.while和when的句子结构分析3.实际例子解析4.总结:何时使用while,何时使用when正文:在学习编程或者英语语法中,while和when这两个词的用法区别常常让我们感到困惑。

别担心,这里有一首顺口溜帮助你牢记它们之间的差别。

While和when,用法有区分,前者引导循环,后者指时间。

一、了解while和when的用法区别首先,我们要明确while和when的基本含义。

While(当……时候)一般用于引导循环语句,表示在某个条件满足的情况下,重复执行一段代码。

而when(当……时候)则表示某个特定时刻,通常用于描述某个事件发生的时间。

二、while和when的句子结构分析1.当while引导循环语句时,其基本结构如下:```while (条件) {// 循环体}```例如:```int i = 0;while (i < 10) {i++;cout << i << endl;}```2.当when引导时间状语从句时,其基本结构如下:```主句+ when(或while)+ 从句```例如:```I will go to the park when(while)it stops raining. ```三、实际例子解析1.使用while的情况:```int j = 0;while (j <= 5) {cout << "j = " << j << endl;j++;}```在这个例子中,while循环会不断执行,直到j的值大于5。

2.使用when的情况:```void showTime() {cout << "现在是:" << currentTime << endl;}void main() {showTime();showTime();showTime();}int main() {Sleep(1000); // 等待1秒showTime();Sleep(1000); // 等待1秒后,执行以下代码cout << "1秒后:" << currentTime << endl; return 0;}```在这个例子中,我们使用when指定了显示当前时间的函数在程序运行的不同时间点被调用。

(完整版)when和while区别及专项练习-含答案(可编辑修改word版)

(完整版)when和while区别及专项练习-含答案(可编辑修改word版)

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1.______ Margo was talking on the phone, her sister walked in.2.______ we visited the school, the children were playing games.3.______ Sarah was at the barber’s, I was going to class.4.______ I saw Carlos, he was wearing a green shirt.5.______ Allen was cleaning his room, the phone rang.6.______ 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。

when和while用法比较

when和while用法比较

when和while用法比较When所引导的从句谓语动词可以是延续性动词,也可以是非延续性动词;从句的时态多用一般现在时或一般过去时。

例句:The train had left when I got to the station.例句:I met one of my old friends when I was walking in the street yesterday.而while引导的主从复合句则通常都为延续性的动词,因而常常使用进行时态。

例句:My mother was cooking while my father was watching TV.例句:One boy is rowing while the other boy in the boat is dangling around his legs in the cool water of the lake.一个男孩正在划船,而船里的另一个男孩则把腿悬垂在凉爽的湖水中。

2、when 可以用于be about to do sth. when ...的固定结构当中例句:I was just about to call you when you called me.例句:When I arrived home, my mother was cooking.当我到家进,妈妈正在做饭。

例句:I get the giggles when I'm nervous.我紧张时就不停地咯咯大笑。

While所引导的从句谓语必须是延续性动词;从句一般要用进行时态,如果主句和从句的动作时同时进行的,则主句也应为进行时态。

例句3:The telephone rang while I was watching TV.当我在天电视时,电话铃响了。

例句4:I was writing a letter while my father was reading a newspaper.我爸爸在看报纸时,我正在写信。

(完整word版)辨析when与while

(完整word版)辨析when与while

when&while用法辨析总结:1. when 的用法比while要广,一般都可用when。

2. 有两种情况通常用while:1)如果从句和主句的动作同时发生,两句都是过去进行时,通常用while。

They were singing while we were dancing.2)前后两句表示对比,这时while表示“而”、“却”。

He is strong while his brother is weak.用when, while填空:1. I was listening to the radio _________ he came in.2. ___________ the teacher came in, we were talking.3. _________ he came back, I was doing some washing.4. I was cooking dinner __________ they came home.5. He fell asleep ____________ he was reading.6. He asked me a question ____________ I was speaking.7. Jim hurt his arm ____________ he was playing tennis.8. ______________ she was waiting for the train, she became very impatient.9. He was watching TV _____________ she was cooking.翻译句子:1. 她进来时我在看电视。

2. 当我在看电视的时候,他正在看书。

3. 我们到达时正下着大雨。

4. Mary在回家的路上,这时两个男孩拦住了她。

5. Lily个子高,Lucy个子矮。

Keys:用when, while填空:1. I was listening to the radio when he came in.2. When the teacher came in, we were talking.3. When he came back, I was doing some washing.4. I was cooking dinner when they came home.5. He fell asleep when / while he was reading.6. He asked me a question while /when I was speaking.7. Jim hurt his arm while /when he was playing tennis.8. When / While she was waiting for the train, she became very impatient.9. He was watching TV while she was cooking.翻译句子:1. She entered the room while /when I was watching TV.2. While I was watching TV, he was reading.3. It was raining hard when we arrived.4. Marry was on her way home when two boys stopped her.5. Lily is tall while Lucy is short.。

while和when的区别有哪些 用法是什么

while和when的区别有哪些 用法是什么

while和when的区别有哪些用法是什么when既可表示某一点时间,也可以表示某一段时间。

while只能表示某一段时间,不能表示某一点时间。

在while引导的时间状语从句中,其谓语动词只能是延续性的,而且也只能与主句中的谓语动词同时发生或存在。

while和when的区别1、侧重点不同when所引导的从句,其谓语动词既可是持续动词,也可是短暂动词;谓语动词动作发生的时间可以与主句谓语动词的动作是同时,或之前、之后。

while句中的谓语动词应为持续动词,不用短暂动词,谓语动作发生的时间通常与主句谓语动词动作发生时间是同时。

2、用法不同when引导的从句作“当…时”或“每逢…”解,从句中的动作既可以和主句中的动作同时发生,也可以在主句的动作之前或之后发生。

while引导的从句作“当…时”或“在…期间”解,它强调从句中的动作与主句中的动作同时发生,但持续时间一般较长或主句的动作在从句的动作过程中发生。

3、词源解说不同when直接源自古英语的hwenne,意为何时。

while直接源自古英语的hwile,意为一段时间;最初源自原始日耳曼语的khwilowhile和when的用法1、whilewhile用作连词时,表示“在…(过程)中,在…期间”。

常用来引导时间状语从句,当主句的主语和while 所引导的从句的主语一致时, while从句中的主语、谓语往往可以省去。

while还可引导让步状语从句,意思是“虽然,尽管”,含有对比意味。

2、whenwhen可用作从属连词,引导状语从句,表示时间时作“当…时,在…的时候”解; 表示条件时作“如果,要是”解; 表示对比时作“既然,考虑到”解。

当when所引导的从句的主语和主句的主语一致时,常将其主语、系动词或助动词省去,只留实义动词或表语,或者改写为短语。

when和while的区别

when和while的区别
you’re watching TV. 你不能一边看电视一边做家庭作业。
三〕、另外,when和while的区分还在于:while 引导的时间状语从句多用进展时态,而when引导 的时间状语从句多用一般时态。
例如: 1、While they were talking , the bell rang. 正在他们谈话的时候,上课铃响了。 2、I was doing my homework when my
〔二〕、while只能表示某一段时间,不能表示某 一点时间。在while引导的时间状语从句中,其谓 语动词只能是连续性的,而且也只能与主句中的 谓语动词同时发生或存在。
例如: 1、While Jim was mending his bike, Lin
Tao came to see him. 正值吉姆修自行车时,林涛来看他。 2、You can’t do your homework while
room. 她走进我房间时,我正在看书。 2、Were you writing when the teacher came in?
教师进来的时候,你在写信吗? 3、When he was a child he was always trying out new
ideas. 他小时候就常常试验一些新的设想。
正在看电视。 I was watching TV when Peter came in. 当Peter进来时我正在看
电视。
2) as 和 when 可与非连续性动词连用,而 while 只能与连续性动 词连用。
例如:He came in when/ as I was going to bed.我刚要上床睡觉, 他进来了。
mother came back home yesterday evening. 昨天晚上妈妈回家的时候,我正在做家庭作

(完整word版)When,While,As引导时间状语从句的区别

(完整word版)When,While,As引导时间状语从句的区别

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 you’ve 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。

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。

①When /While /As we were dancing,a stranger came in.(dance为延续性动词)当我们跳舞时,一位陌生人走了进来。

②When /While /As she was making a phone call,I was writing a letter.(make为延续性动词)当她在打电话时,我正在写信。

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1、When 和While 的区别when,while 都有“当……时候”的意思.when 既可表示某一点时间,也可以表示某一段时间.(一)在when 引导的时间状语从句中,其谓语动词可以是延续性的,也可以是非延续性的,可与主句中的谓语动词同时发生,也可在其后发生.例如:1、I was just reading a book when she came into my room.她走进我房间时,我正在看书.(二)、while 只能表示某一段时间,不能表示某一点时间.在while 引导的时间状语从句中,其谓语动词只能是延续性的,而且也只能与主句中的谓语动词同时发生或存在.例如:1、While Jim was mending his bike, Lin Tao came to see him.正当吉姆修自行车时,林涛来看他.Remark: 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.2、倒装知识点完全倒装表示地点的副词here, there 置于句首, 且主语是名词(不是代词) 时表示时间、方向的副词或介词短语置于句首, 且主语是名词(不是代词) 时作表语的形容词、分词、介词短语、such 置于句首时部分倒装“ only+状语” 置于句首, 主句需要部分倒装具有否定意义或半否定意义的副词以及含否定词的介词短语置于句首作状语时“so 或neither + 助动词/情态动词/be 动词+主语”表示“……也/也不”so/such...that...句型以had/were/should 开头省略if 的虚拟条件句* 形式倒装感叹句the more...the more...句型whatever 或however 引导的让步状语从句as /though 引导的让步状语从句考点一倒装句一、完全倒装(Full Inversion)谓语部分完全放在主语之前的句子,便是完全倒装句。

1.副词、介词短语类:①表示地点的副词here, there 置于句首, 且主语是名词(不是代词) , 需用完全倒装, 其形式为: There/Here+谓语+主语。

常用于此句型的谓语动词为be, go, come, exist, follow, remain, lie 等, 时态要用一般现在时。

There goes the last bus.末班公共汽车开走了。

Here is the address of your hotel.这里就是你宾馆的地址。

There goes the bell for break.下课铃响了。

Here you are.给你。

(代词作主语, 不倒装)②表示时间的副词(如: now, then 等) 、运动方向的副词(如:out, in, up, down, away 等) 及表示地点的介词短语置于句首, 且主语是名词(不是代词) , 需用完全倒装, 其形式为: 副词或介词短语+谓语+主语。

常用于此句型的谓语动词为come, fall, follow,exist, lie, go, remain, run 等, 时态为一般现在时或一般过去时。

Now comes your turn! 现在该你了!Up went the arrow into the air.箭直射向空中。

Under the table sleeps a white cat.在桌子下面睡着一只白色的猫。

Behind the counter he stood. 他站在柜台后面。

(代词作主语, 不倒装)2.表语类:为了保持句子平衡或强调表语部分等, 将作表语的形容词、分词、介词短语、such 置于句首时, 需用完全倒装, 其形式为: 形容词/现在分词/过去分词/介词短语/such+be+主语。

Happy are those who are contented.知足者常乐。

Growing all over the mountain are wild flowers.漫ft遍野长满了野花。

Seated on the ground are a group of young people.席地而坐的是一群年轻人。

Inside the parcel was a letter.包裹里有封信。

Such were his words.( = Such was what he said.)这就是他说的话。

二、部分倒装(Partial Inversion)把be 动词、助动词或情态动词置于主语之前的句子叫部分倒装句。

这类句型主要有下面几种:1. Only 修饰的副词、介词短语或状语从句置句首时Only then did I begin my work.Only if you ask many different questions will you acquire all the information.Only in this way can we learn English well.只有用这种方法我们才能学好英语。

使用特点:(1) 在部分倒装句中, 如果谓语部分无助动词, 则需找助动词来“帮助” 构成倒装句。

(x) Only after the war learned he the sad news.(√) Only after the war did he learn the sad news.只是在战后他才得知那个不幸的消息。

(2) only 修饰状语从句时, 从句不可倒装, 主句倒装。

(x) Only when did he return we found out the truth.(√) Only when he ret urned did we find out the truth.只是当他回来的时候, 我们才查明了真相。

(3) only 修饰主语时, 句子不可倒装。

(x) Only can he answer the question.(√) Only he can answer the question.只有他能回答这个问题。

2.含有否定意义的词语在句首(否定词有 never,not,notonly,little,seldom,hardly,few,nowhere,scarcely,neither,nor,no longer,not until,not once,in no way,in no case,at no time,no sooner than,hardly when 等等)特别注意,in no time 的意思是马上,不含否定意思,因此它置句首句子不倒装!!!Not only was there no electricity,but also no water.Never will he forget his first time to take a plane.Hardly had I got out of the house when it began to rain.3.在 so/such...that...结构中,so/such 放句首时So proud was he that he never listened to any advice.Such a kind person is he that...4.虚拟条件从句省略 if 时(只有 if 后面跟 should,had,were 时可省略 if)Should you need more information,please let me know.Had Mark invited me I would have been glad to come现在分词做定语和过去分词做定语(1)现在分词做定表现形式:名词+ v-ing 或者v-ing + 名词特点:既可以放在被修饰名词的前面也可以放在被修饰名词的后作用:1.表示被修饰名词正在进行的动作;2.表示被修饰名词的特征例子:a promising young man 一个有前途的年轻人(特征)Falling leaves 正在飘落的叶子(正在进行)A room facing the sea 一个面朝大海的房间(特征)A girl standing at the gate 一个正站在门边的女孩(正在进行)注意:不要将现在分词和谓语动词混淆。

如:I like the girl standing at the gate。

这句话意思是我喜欢站在门边的那个女孩,其中“like”是谓语动词,而“standing”则是修饰“girl”的现在分词。

(2)过去分词作定语表现形式:名词+ v-ed 或者v-ed + 名词特点:既可以放在被修饰名词的前面也可以放在被修饰名词的后作用:1.表示被动;2.表示被修饰名词的已完成的动作例子:fallen leaves 已经飘落的叶子(表示完成)A respected general 一个被人尊敬的将军(表示被动)A girl called lily 一个被叫做lily 的女孩(表示被动)A machine invented by the scientists 一个被科学家发明的机器(表示被动)注意:过去分词放在名词后面一定表示被动。

同学们仍需要注意过去分词做定语和谓语动词的区别。

前置定语和后置定语前置相当于形容词,后置相当于定语从句。

1、前置定语单个的过去分词作定语,通常放在被修饰的名词之前,相当于形容词,表示被动和完成意义。

A 类:被动意义:an honored guest 一位受尊敬的客人The injured workers are now being taken good care of in the hospital.受伤的工人现正在医院受到良好的照料。

B 类:完成意义:a retired teacher 一位退休的教师They are cleaning the fallen leaves in the yard.他们正在打扫院子里的落叶。

2、后置定语过去分词短语作定语时,通常放在被修饰的名词之后,它的作用相当于一个定语从句。

如:his will be the best novel of its kind ever written (=that has ever been written).这将是这类小说中写得最好的.Who were the so-called guests invited (=who had been invited) to your party last night?昨晚被邀请参加你的晚会的那些所谓的客人是谁呀?。

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