however表示转折与让步的用法

however表示转折与让步的用法

1.however用作副词，表示转折，常用于谈及一个既成事实时，意为“然而；但是”。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：

However, long before that brave merchants were the real explorers of the Western Ocean.

（Page12）

She felt ill. She went to work,however,and tried to concentrate.

but和however都含有“但是、然而”的意思，但用法上有区别：

⑴从语义上看，but表示非常明显的对比，转折的意味比however强。

⑵从语法上看，but是个并列连词，而however却是个副词。

⑶从语序上看，but总是位于它所引出的分句之首，而however可以位于分句之首、之中或之后，但在译成汉语时一定把它放在分句之首。

⑷从标点上看，but之后一般不得使用逗号，但however位于分句之首时，通常用逗号；位于分句之中时，通常在其前、后各加一个逗号；位于分句之尾时，则必须在其前加逗号。如：Mary went to the party, but her sister didn’t.

He hasn’t arrived. He may, however, come later.

He said that it was so, he was mistaken, however.

2.however用作连词，相当于no matter how，引导让步状语从句，意为“不管怎样……；无论如何……”，其结构有如下两种：

①however+形容词+主语+系动词。如：

We shall never succeed,however much we try.

②however+副词+主语+谓语。如：

However fast he runs,he can’t catch up with us.

【高考链接】

_____hungry I am, I never seem to be able to finish off this loaf bread（08辽宁）

A. Whatever

B. Whenever

C.Wherever

D. However

【名师点津】选D。本题考查状语从句。句意：无论我多么饿，我好象永远不能吃完这块面包。此处however no matter how。

C e y l o n,w i t h i t s c e n t r a l p o s i t i o l a c e where Chinese merchants met with Arab merchants and heard about the westernmost lands.

“with+复合宾语”在句中的作用

1. “with+复合宾语”结构在句子中主要充当状语，表示行为方式，伴随情况、时间、原因或条件等。

①表示伴随状况状语

She came into the room，with her nose red because of cold

②表示原因状语

The little girl was crying with her pen broken.

③表示时间状语

With my homework finished，I went fishing with my father．

④表示行为方式状语

The soldiers had him stand with his back to his father.

⑤表示条件状语

He could finish it with me to help him.

With all the things considered, her proposal is of greater value than yours.

⑥表示结果状语

He kept the money, without anybody knowing where it was.

2. “with +复合宾语”在句中作定语，相当于一个定语从句。如：

The room with the window half open is my bedroom.

The basket with flowers filled in it has been taken away.

There were rows of white houses with trees in front of them.

3.“with+复合宾语”用作伴随状语时，常可省略with 而成为独立主格结构。如：

The old man sat in his chair, with a pipe in his hand.

The old man sat in his chair, a pipe in his hand.

【高考链接】_______and no way to reduce her pain and suffering from the terrible disease, the patient sought her doctor 's help to end her life .(05江苏)

A.Having given up hope of cure

B.With no hope for cure

C.There being hope for cure

D.In the hope of cure

【真题解析】B。考查with的复合结构作状语的用法。逗号前的内容作状语，该部分是由介词with构成的短语及现在分词短语suffering from the terrible disease构成的，介词with有两个宾语，分别是no hope for cure和no way to reduce her pain。句意：这位病人由于没有治愈的希望和减轻其痛苦的方法，她饱受疾病煎熬，于是请求大夫结束她的生命。

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.

英语作文中常用过渡词和句型

1.常用于文章开始的过渡词语和句子 (1)To begin with首先 例：To begin with, smoking should be banned in public areas.”首先，公共场所禁止吸烟。” (2)Generally speaking一般地说，总体上说 例：Generally speaking, it is the best policy to spend more money on libraries.”总的说来，加大图书馆的投资是良策。” (3)First of all第一，首先 例：First of all, many people in remote areas still live in poverty.”第一，居住在边远地区的许多人仍生活在贫困之中。” (4)With (the development/progress/growth) of(economy/society)…随着(经济、社会)的(发展、进步、增长)… 例：With the development of society, women’s role has become more imp ortant than ever before in daily life.”随着社会的发展，妇女在社会生活中比以往发挥着更加重要的作用。” (5)Recently近来 例：Recently，the problem (conflict, production) of grain shortage has become the world focus.”近来粮食短缺问题已成为全球关注的焦点。” 2.常用于文章结尾的过渡词和句子 (1)In conclusion最后，在结束时 例：In conclusion, the international agreement should be made to prevent the world from war.”最后，应达成国际协定使世界避免战争。”

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.wendangku.net/doc/b211631043.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

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。

英语四级写作翻译常用过渡词

英语四级写作翻译常用过渡词 1. 文章及段落起始常用的过渡词语to begin with (首先); generally speaking (总体上讲); first of all (第一，首先); in the first place (首先) 2. 文章及段落结尾常用的过渡词语therefore, thus (因此); in conclusion (最后); in brief, in a nutshell (简言之); to sum up (总而言之); in a word (总之) 3. 常用表示先后次序的过渡词语first (第一);second (第二);next (其次，然后); eventually (最后，最终) since then (自此以后); afterward (以后，随后); meanwhile (同时) therefore (因而); immediately (立刻); finally (最后，最终) 4. 常用表示因果关系的过渡词语Accordingly (于是); for this reason (由于这个原因); as a result of (由……的结果); in this way (这样); consequently (结果，因此); due to(由于……);Therefore (因而); because of (因为); thus (这样) 5. 常用表示比较和对比的过渡词语In contrast with (和……成对照); similarly (同样); whereas (然而); on the contrary (相反); different from (与……不同); likewise (同样); equally important (同样重要); on the other hand (另一方面) 6. 常用表示举例的过渡词语 A case in point (恰当的例子); for example (举例); namely/that is (即，这就是说); for instance (举例)

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？

让步状语从句用法归纳

SDN让步状语从句 让步状语从句是状语从句中的一种，其本身也是状语从句。一般翻译为“尽管……”或“即使……”，就是我们日常生活中用的“退一步说……”的感觉。 引导让步状语从句的连词主要有以下这些：though,although,while,as; even if,even though; whether...or...; no matter+疑问词，疑问词-ever，regardless of+名词/名词短语/名词从句，despite，in spite of。切记although，though 不可与but连用，但可以与still和yet连用。 ⑴though,although表示“虽然，纵然”之意。 这两个连词意思大致相同，在一般情况下可以互换使用。在口语中，though较常使用，although比though 正式，二者都可与yet,still或never，the less连用，但不能与but连用。例如： My will remains firm though I must lower my physical sights. 尽管我得降低体育（锻炼）的目标，但我的意志是坚强的。 Though I believe it,yet I must consider. 尽管我相信这一点，但我还得考虑考虑。 Although/Though he was exhausted,(still) he kept on working. 虽然他已经精疲力竭了，但仍然继续工作。 Although/Though he is very old,(yet) he is quite strong. 他虽然年纪大了，身体还很健壮。 值得注意的是，although引导的让步状语从句位于主句之前的情况较多，though引导的让步状语从句可位于主句之前或主句之后。例如： She passed the examination though she had not studied very hard. 她虽然不用功学习，考试却及格了。 ⑵as,though表示“虽然……但是”，“纵使……”之意。 as引导的让步状语从句必须以部分倒装的形式出现，被倒装的部分可以是表语、状语或动词原形，though 也可用于这样的结构中，但although不可以这样用。例如： Object as you may,I’ll go.(=Though/Although you may object,I’ll go.) 纵使你反对，我也要去。 Hard as/ though he works,he makes little progress. (=Though he works hard,he makes little progress.） 尽管他学习很努力，但几乎没取得什么进步。 Child as/though he was,he knew what was the right thing to do.（=Though he was a child,he knew what was the right thing to do.） 虽然他是一个孩子，但他知道该做什么。 Fast as you read,you can’t finish the book so soon. 纵然你读得快，你也不能这么快读完这本书。 Lover of towns as I am ,I realize that I owe a debt to my early country life. 尽管我爱城市，但我知道，以往的乡村生活使我受益匪浅。 Small as atome are,they are made up of still samller units. 尽管原子很小，但它们由更小的单位构成。 ⑶even if,even though 表示“即使……”，“纵使……”之意，含有一种假设。 这两个复合连词的意思基本相同。它们常互换使用，但意义有细微差别。even if引导的让步从句含有强烈的假定性，可用来表示与事实相反的假设，但不能用来描述已经发生的事实。而even though引导让步状语从句时，是以从句的内容为先决条件的，即说话人肯定了从句的事实，表示已经发生了的事。例如： We’ll make a trip even if/though the weather is bad. 即使天气不好，我们也要作一次旅行。 Even if he is poor,she loves him. (=He may be poor,yet she loves him.）

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。

英语作文常见过渡词

英语作文常见过渡词 (1)表并列关系的过渡词: and, not only…but also, both …and, either …or, neither…nor (2)表递进关系的过渡词: besides, in addition(加之，除……之外), moreover(此外，而且), what’s more (3)表转折对比的过渡词: but, however, although, on the one hand …on the other hand, some…others… (4)表原因的过渡词: because, because of, thanks to, due to(由于) (5)表结果的过渡词: so, therefore, as a result, so that, so…that, such…that (6)表条件的过渡词: if, unless, as/so long as (7)表时间的过渡词: when, after, before, until, as soon as, later, from then on, at the same time, finally, at last, form now on, at present (8)表特定的顺序关系的过渡词: first, second, third, firstly, secondly, thirdly, above all,

first of all, then, next, finally, in the end, at last (9)表换一种方式表达的过渡词: in other words, that is to say (10)表进行举例说明的过渡词: for example, like, such as (11)表陈述事实的过渡词: in fact, actually, as a matter of fact, to tell you the truth (12)表强调的过渡词: above all, most important, in fact, no doubt, without any doubt, obviously (13)表目的的过渡词: for this reason, for this purpose, so that, in order to, so as to (14)表总结的过渡词: in a word(总之，简言之), in conclusion, in summary

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:");

六种常见的让步状语从句例析-最新教育文档

六种常见的让步状语从句例析 英语中的让步状语从句多种多样。本文将对其作一归纳和分析。 1.由although 或though 引导的让步状语从句。这两个词都不能同时与but连用，但可以与yet 连用。Though 引导让步状语从句时，可将从句中的表语提到though的前面。例如： Although he is young, he knows a great deal. 尽管他很年轻，但他懂得很多。 Smart though he is, he doesn’t study hard.尽管他很聪明，但他学习不下功夫。 2.由as 引导的让步状语从句。这种让步状语从句通常以以下几种形式出现： 1）名词/形容词/过去分词+as+主语+/be/其它动词。前置的表语为名词时，其前往往不带冠词。例如： Impressive as the record is, it fades next to the story of Armstrong’s struggle against diseases.尽管这项记录给人的印象深刻，但不如阿姆斯 特朗同疾病作斗争的故事令人瞩目。 Well paid as he was, he often ended up in financial trouble.尽管他工资很高，但经常入不敷出。 Teenager as he is, he knows a great deal. 尽管他是个十几岁的孩子，他知道的东西却很多。 Hero as he is, he has shortcomings. 尽管他是个英雄人物，但他也

有缺点。 2)副词+as+主语+谓语+其他成分。例如： Much as I like this book, I will let you read it first.尽管我非常喜欢这本书，但我还是想让你先读一读。 注：若从句中没有副词，可以将谓语部分中的主动词提到as前面，再在主语后面加may/might/can/could/will/would等情态动词或助动词do/did/does等。例如： Try as he might, Tom couldn't get out of the difficulty.尽管汤姆很努力，但他仍不能摆脱困境。 Search as I would everywhere , I could find no sign of him.尽管到处寻找，我也不能发现他的一点行踪。 3.由even though 或even if 引导的让步状语从句。例如： Even if we should fail ten times, we wouldn’t lose heart.即使我们失败十次，我们也不会灰心丧气。 Even though you don’t come, I will call you up at night.即使你不来，我晚上也会给你打电话。 4.由whether ….or引导的让步状语从句。例如： Whether you are boys or girls, you must obey the rules of the school. 不论你们是男生还是女生，你们都必须遵守学校的规章制度。Whether you go there by sea or by air, you will enjoy your trip. 不论乘船还是乘飞机去那儿，你的旅途都会愉快的。 5.由while 引导的让步状语从句。例如：

英语高分作文必备：过渡词和同义高级词汇短语

高分英语作文必备 过渡词 同义高级词汇表达 过渡词在写作中起着承上启下的作用，它的恰当使用让文章 内容更流畅，条理更清晰，结构更合理。同时高考英语写作满分 的评判条件就是，是否有效地使用了语句间的连接成分，使全文 结构紧凑。据此过渡词的使用在写作中起着至关重要的作用。我 们在选用过渡词的时候， 尽量做到 无痕化 ，达到启承转合的效果。 衔接要“巧”， 过渡要“妙” 类别 1：良好的启下开端 It's said that... 据说 ?? As we all know that... It's well known that... As/So far as I know... It is clear/obvious that... Nowadays , At present, Knowing /Seeing that ? 听说， With the development of ?随着什么的发展 With the Spring Festival approaching/around the corner/ ?随着什 么临近 类别 2：自然的承上拓展 first/firstly 第一 first of all 首先 to begin/start with in the first place second/secondly next 其次；然后 and then 于是；然后 类别 3：详细的并 列补充 also/too/as well 也；同样；而且 both...and... ??和 ?? either...or... 要么 ??要么 ?? neither...nor... 既不 ??也不 ?? not 我们都知道 ?? 众 所周知 ?? 据我所 知 ?? ??是显而易见 的 现在 首先 首先 第二

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）

英语作文过渡词

（1）表并列关系的过渡词: and, also， as well, as well as，or, too, not only…but also, both … and, either … or, neither…nor （2）表递进关系的过渡词: besides, in addition（加之，除……之外）, moreover(此外，而且), what’s more，what’s worse （3）表转折对比的过渡词： yet, instead, on the other hand, on the contrary, although, different from, despite, in s pite of, whereas, unlike, nevertheless, not only…but also, years ago…today, the former…the latter, the first… whereas the second, once…now, on the one hand … on the other hand, some…others （4）表原因的过渡词: because, because of, since, as, for, now that, thanks to, due to（由于）（5）表结果的过渡词: so, thus, therefore, as a result, so that, then, thereby, hence, so…that, such…that （6）表条件的过渡词: if, unless, on condition that, as/so long as （7）表时间的过渡词: when, while, after, before, until, as soon as, later, afterwards, soon, lately, recently, since, from then on, eventually, in the meantime, then, suddenly, at the same time, next, early this morning / year / century, after a while, in a few days, now, presently, finally, at last, all of a sudden, form now on, at present, immediately, the moment （8）表特定的顺序关系的过渡词: first, firstly, second, secondly, third, thirdly, above all, first of all, then, next, finally, in the end, at last, afterward(s)（后来）, meanwhile （几乎同时）, thereafter（在那以后）, last, finally, eventually（终于）（9）表换一种方式表达的过渡词: in other words, that is to say, to put it another way （10）表进行举例说明的过渡词: for instance, for example, like, such as （11）表陈述事实的过渡词: in fact, actually, as a matter of fact, to tell you the truth （12）表强调的过渡词: certainly, indeed, above all, surely, most important, in fact, no doubt, without any doubt, truly, obviously （13）表比较的过渡词： like, unlike, in the same way, similarly, similar to （14）表目的的过渡词： for this reason, for this purpose, so that, in order to, so as to （15）表总结的过渡词: in a word(总之，简言之), in general, in short(总之), above all, after all, generally speaking, to sum up, finally, in conclusion, at last, in summary

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