While的用法

While的用法
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

词时,while和when可以互相替换。例如:

While we were talking,the teacher came in.(我们正在谈话时,老师进来了。)

The bus had left when we arrived at the bus stop.(当我们到达车站时,公共汽车已经开走了。)

(arrive是非延续性动词,因此,此句中的when不能用while替换。)

When/While we were having a meeting,our teacher came in.(我们正在开会时,老师走了进来。)

(have是延续性动词,因此,句中的when可以用while替换。)

4、while引导的状语从句还可以表示“某个动作正在进行的同时,另一个动作也在进行之中”。例如:

While the teacher was speaking,the students were listening.(老师讲课时,学生们在听。)

While he was writing,I was reading.(他写字时,我在看书。)

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。

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。

when 和while的用法区别

when 和while的用法区别 两者的区别如下: 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。 一。引导时间状语从句时,WHILE连接的是时间段,而WHEN连接的多是时间点 例如What does your father do while your mother is cooking? What does your mother do when you come back? 二,WHILE可以连接两个并列的句子,而WHEN不可以 例如I was trying my best to finish my work while my sister was whtching TV 三,WHEN是特殊疑问词,对时间进行提问,WHILE不是。 例如,When were you bron? 续性动词和短暂性动词 英语中的动词,是学习中的重点,又是难点。英语中的动词有多种分类法。根据其有无含义,动词可分为实义动词和助动词;根据动词所表示的是动作还是状态,可以分为行为动词和状态动词;根据动词所表示的动作能否延缓,分为延续性动词和终止性动词。 可以表示持续的行为或状态的动词,叫做“延续性动词”,也叫“持续性动词”,如:be, keep, have, like, study, live, etc. 有的表示短暂、瞬间性的动词,叫做“终止性动词”,也可叫“短暂性动词”,或“瞬间性动词”,如die, join, leave, become, return, reach, etc.

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。 https://www.360docs.net/doc/c0421428.html,ing 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

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”。

when和while的用法解析、练习题及答案(附总结表格)

when和while的用法解析、练习题及答案(附总结表格) 一、讲解三例句: 1. The girls are dancing while the boys are singing. 2. Lucy’s mother is cooking when she gets home. 3. When/While Lucy’s mother is cooking, she gets home. 二、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. ______ it began to rain, they were playing chess. 10. She saw a taxi coming ______ the woman was waiting under the streetlight. 三、语法 while和when都是表示同时,到底句子中是用when还是while主要看主句和 从句中所使用 的动词是短暂性动作(瞬时动词)还是持续性动作。 1、若主句表示一个短暂性动作,而从句表示的是一个持续性动作时,用 When/While。如: He fell asleep when while he was reading. 他看书时睡着了。

while的用法

由高考题看while的用法 [常见错误] 误①:While I came in, he was reading a book. 误②:She took a bath while preparing a meal. 误③:She drinks black coffee when I prefer it with cream. 误④:While he understands your idea, but he doesn't agree with you. [主要用法] 1. 用作从属连词,意思是“当……时;和……同时”,引导时间状语从句。注意该状语从句的谓语动词必须是延续性动词,不能是终止性动词,如果是终止性动词,酌情用when或as。 They phoned while you were out. 你不在家时他们打来了电话。(be out为延续性动词)When I came in, he was reading a book. 我进来时,他正在看一本书。(come 为终止性动词)(参见“误①”) 2. 如果从句的主语与主句的主语为同一人且从句的谓语含有系动词be时,可省略从句的主语及系动词be;如果从句的主语与主句的主语不是同一人,则不可省略。 The child watched TV while (he was) eating. 这个男孩边吃边看电视。 She took a bath while I was preparing a meal. 我准备饭菜的时候,她在洗澡。(参见“误②”) 3. 用作并列连词,意思是“但;却;然而”,表示对比或与前面的情况相反,注意when和as不能表示这一含义。 She drinks black coffee while I prefer it with cream. 她喜欢喝清咖啡而我喜欢加奶油的。(参见“误③”) I earn only 100 dollars a month, while you earn 400 dollars. 我一个月只赚一百美元,你却赚四百美元。 4. 用作从属连词,表示让步,意思是“虽然”,其意义相当于although,主要用于书面语中。注意主句的前面不可有but等连接词。 While he understands your idea, he doesn't agree with you. 虽然他了解你的想法,但他还是不赞同你。(参见“误④”) 5. while作名词时,意思是“一点时间;一会儿”,表示泛指时常与a连用;表示特指时可与the, this, that连用。常用的短语有:after a while过了一会儿;all the while一直;in a while 不久;once in a while偶尔等。 It took her quite a while to find a hotel. 她花了很长时间才找到一家旅馆。 Where have you been all this while? 这阵子你一直在哪儿?

(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。

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。

c中while的用法

c中while的用法 c中while的用法的用法你知道吗?下面就跟你们详细介绍下c 中while的用法的用法,希望对你们有用。 c中while的用法的用法如下: while语句的一般形式为: while(表达式) 语句 其中表达式是循环条件,语句为循环体。 while语句的语义是:计算表达式的值,当值为真(非0)时,执行循环体语句。其执行过程可用下图表示。 【例6-2】用while语句计算从1加到100的值。用传统流程图和N-S结构流程图表示算法,见图: 01.#include <stdio.h> 02.int main(void){ 03.int i,sum=0; 04.i=1; 05.while(i<=100){ 06.sum=sum+i; 07.i++; 08.} 09.printf("%d\n",sum);

10.return 0; 11.} 【例6-3】统计从键盘输入一行字符的个数。 01.#include <stdio.h> 02.int main(void){ 03.int n=0; 04.printf("input a string:\n"); 05.while(getchar()!='\n') n++; 06.printf("%d",n); 07.return 0; 08.} 本例程序中的循环条件为getchar()!='\n',其意义是,,只要从键盘输入的字符不是回车就继续循环。循环体n++完成对输入字符个数计数。从而程序实现了对输入一行字符的字符个数计数。 使用while语句应注意以下两点。 1) while语句中的表达式一般是关系表达或逻辑表达式,只要表达式的值为真(非0)即可继续循环。 01.#include <stdio.h> 02.int main(void){ 03.int a=0,n; 04.printf("\n input n:");

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。

as while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,三者都可用: He fell asleep when [while, as] he was reading. 他看书时睡着了。 【注】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(action)和发展(development) 意味的动词,一般不能是那些不用于进行时态的动词(如be, seem, love, want, agree, see, know, have 等),所以下面一句中的while 不能换为as: A:I’m going to the post office. 我要去邮局。 B:While you’re there, can you get me some stamps? 当你在邮局时,能帮我买几张邮票吗? (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,我默不作声。 但是,若主从句表示的两个同时进行的动作含有“一边…一边”之意思,通常用as: She sang as she went along. 她边走边唱。 (3) 若从句是一个短暂性动作,主句是一个持续性动作,可用as / when 但不用while: It was raining hard when [as] 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as / when: I thought of it just when [as] you opened your mouth. 就在你要说的时候,我也想到了。 (5) 若要表示两个正在发展变化的情况,相当于汉语的“随着”,一般用as:Things are getting better and better as time goes on. 随着时间的推移,情况越来越好。 As it grew darker, it became colder. 天色越晚,天气越冷。 (6) 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。 (7) 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。 (8) 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);但as 则没有类似用法: 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。 (9) as 和when 后均可直接跟一个名词,构成省略句,但while 一般不这样用:As [When] a boy, he lived in Japan. 他小时候在日本。 (10) when 和while 后可接现在分词、介词短语、形容词等构成省略句,但as 一般不这样用: When [While] reading, he fell asleep. 他看书时睡着了。 When [While] in trouble, ask her for help. 遇到麻烦的时候你就去找她帮忙。

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)

when while用法区别

While和When在过去进行时中两者的区别如下: 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 当……时候 while能用when代替; 但是when却不一定能用while代替. while+从句, 动作一定会延续 when+延续性动词/瞬间动词; when he arrived

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

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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