but, however, although, while用法练习

一、单项填空。

1. Though he is at the bottom of the class, ________ he doesn't lose heart.

A. but

B. however

C. although

D. yet

2. The report shows that we are making progress ________ we need to make greater efforts.

A. still

B. however

C. while

D. but

3. I have never spoken ill of her, ________ I don't like her.

A. if

B. because

C. so that

D. though

4. I do every single bit of housework ________ my husband Bob just does the dishes now and then.

A. that

B. while

C. when

D. as

5. —I don't like chicken ________ fish.

—I don't like chicken, ________ I like fish very much.

A. and; and

B. and; but

C. or; but

D. or; and

6. —Would you like to come to dinner tonight?

—I'd like to, ________ I'm too busy.

A. and

B. so

C. as

D. but

7. Our country has plenty of oil, ________ their country has none.

A. when

B. while

C. as

D. though

8. Tom, I hate noisy parties. I'll go to this one, ________.

A. too

B. also

C. however

D. but

9. ________ he said he was our friend, ________ he would not help us.

A. Since; and

B. As; because

C. Though; yet

D. Though; but

10. Between the two generations, it is often not their age, ________ their education that causes misunderstanding.

A. like

B. as

C. or

D. but

二、单句改错。

1. He knows so many difficulties are in front of him. He will not, although, give up.

2. I didn't know the way to the airport, however my brother knew.

3. Competition in sports should be fair; but, there are sportsmen every year who are reported to use dope.

4. He wants to study abroad, but his brother wants to stay and earn some money in their hometown.

5. Although he is in poor health, but he works hard.

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BUT用法

甘肃王曰福 but 一词既可作连词、介词、副词用，又有一些习惯搭配和固定用法，现对其用法作以下归纳。一、用作连词 1. 用作等立连词，使其前后的词、短语、分句相互对照，作“但是，然而，可是”解。例如： She is young but very experienced. 她虽然年轻但经验丰富。 2. 用于表示歉意的话语之后，表示谢绝或不赞成。例如： I'm sorry, but I disagree with you. 对不起，我不同意你的意见。 3. 用于两个并列的分句之间，与前面的否定词形成对比，作“无……而不……”解。例如： It never rains but it pours. 不雨则已，一雨倾盆。 I never go past that house but I think of my miserable life in the old society. 我走过那所房子时，没有一次不想起我在旧社会所过的悲惨生活。二、用作介词 1. 与 no ， nobody ， nothing ， none ， who 等词连用，作“除……之外”解，用来排除同类中的一分子，或从整体中除去一部分。例如： Nobody knew her but me. 除我以外，没有人认识她。 Nothing but disaster would come from such a plan. 这个计划只能带来灾难，别无益处。 2. but 前面有 do 的某种形式时， but 后面的动词不定式要省略 to ；其前没有 do 的某种形式时， but 后面的不定式要带 to 。例如： We had no choice but to wait. 除了等待，我们别无选择。 He did nothing all day long but watch TV. 一整天，他除了看电视，别无他事可做。

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/de15841737.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

But 用法小结

But 用法小结 but一词在英语教材中复现率极高，用法也颇为复杂，现总结如下：一、conj. “但是”，“可是”，“而且” English may be hard,but it is the most important of all. 英语虽然很难，但却是最重要的。注意：but 不能与although或though 连用,因为它们是连词,故不能同时出现在句子中，如：虽然他是个孩子，但是却懂得很多。 Although he is only a child,but he knows a lot. (×) Although he is only a child,he knows a lot.(√) He is only a child,but he knows a lot.(√) 二、adv. (=only) “仅仅” “只是” I can’t tell you but one thing—my age. 我只有一件事不能告诉你，即我的年龄。 You have but choices—follow me or refuse me. 你只有两个选择，要么听我的，要么拒绝我。三、prep.“除了”（多和不定代词连用） 1、接人称代词 They are all wrong but her/she.除了她以外，他们都错了。 * 用she时，but为连词。 2、接介词短语 You can put it anywhere but on the floor. 你就是不能把它放在地上。 You can find that kind of thing nowhere but in England. 这种东西只能在英国找到。 3、接形容词 Shelooks anything but well.(She looks ill.) 她看来是病了。 The park is all/anything but beautiful.这公园一点也不美。 4、接数词 I know them all but two. 他们当中我只有两个不认识的。 He lives in the next house but one.他住在隔壁的隔壁。 She lives in last house in the street but two.她住在这条街的倒数第三家。 * next but one/two 隔一/两个；第三/第四 Last but one/two 倒数第二/第三 5、接不定式 He wanted nothing but to stay here for another day.他只是想在这再呆一天。 I have no choice but to tell you the truth. 我只有告诉你实话。 There was nothing to do but (to) wait till help came. 只有等待救援了。 * 如果谓语动词为实意动词do的某种形式时，but 后的不定式要省略符号to. 如： I can do nothing but let him know. 我只能通知她。 They did nothing but complain. 他们只是抱怨。 6、接从句 Nothing would contend him but (that) I must come. 必须我来了他才能满意。

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？

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

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:");

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。

but 的用法

but 的用法甘肃王曰福 but 一词既可作连词、介词、副词用，又有一些习惯搭配和固定用法，现对其用法作以下归纳。一、用作连词 1. 用作等立连词，使其前后的词、短语、分句相互对照，作“但是，然而，可是”解。例如： She is young but very experienced. 她虽然年轻但经验丰富。 2. 用于表示歉意的话语之后，表示谢绝或不赞成。例如： I'm sorry, but I disagree with you. 对不起，我不同意你的意见。 3. 用于两个并列的分句之间，与前面的否定词形成对比，作“无……而不……”解。例如： It never rains but it pours. 不雨则已，一雨倾盆。 I never go past that house but I think of my miserable life in the old society. 我走过那所房子时，没有一次不想起我在旧社会所过的悲惨生活。二、用作介词 1. 与 no ， nobody ， nothing ， none ， who 等词连用，作“除……之外”解，用来排除同类中的一分子，或从整体中除去一部分。例如： Nobody knew her but me. 除我以外，没有人认识她。 Nothing but disaster would come from such a plan. 这个计划只能带来灾难，别无益处。 2. but 前面有 do 的某种形式时， but 后面的动词不定式要省略 to ；其前没有 do 的某种形式时， but 后面的不定式要带 to 。例如： We had no choice but to wait. 除了等待，我们别无选择。 He did nothing all day long but watch TV.

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。

but的用法

二、用作介词 1. 与no ，nobody ，nothing ，none ，who 等词连用，作“除……之外” Nothing but disaster would come from such a plan. 这个计划只能带来灾难，别无益处。 2. We had no choice but to wait. 除了等待，我们别无选择。 He did nothing all day long but watch TV。。三、用作副词 1. 意思上相当于only ，后面跟名词或动词。 We can but try now. 我们现在只有尝试一遍。 2. but 出现在too …to …结构前面时，表肯定 I'm but too glad to go there with you. 我非常高兴和你一起去那里。四、含but 的习惯用语 1. but for ＝without ，意为“要不是；如果没有”，意思上相当于一个虚拟条件句。 But for the rain (If it hadn't rained), we would have had a pleasant journey. 要不是天下雨，我们这次旅行就惬意了。 But for your help, we couldn't have carried out the plan. 如果没有你的帮助，我们不可能实现那个计划。 2. but that = except that ，意为“若非；要不是”，引导虚拟条件状语从句。 He would have helped me but that he was short of money at that time. 要不是他那时候没钱，他会帮助我的。 3. but then = on the other hand ，“不过；在另一方面”。 London is a noisy place, but then it's also a place where you get the best entertainment. 伦敦是个闹市，不过它也是能够给你最好娱乐的地方。 4. nothing but = only ，意为“只；不过是”。 We could see nothing but water. 我们只能看见水。 6) anything but 绝不,远非 He is anything but an honest man. 他绝不是个诚实的人. 5. not …but …意为“不是……而是……”，连接两个并列的名词、形容词、副词、短语或分句 My bag is not black but red. 我的书包不是黑色的而是红色的。。 6. no …but意为“没有……不……”;虽然，尽管。 No child but likes Old Li in our village. 没有孩子不喜欢我们村里的老李。 I can’t marry her, no bu t we love each other very much. 我不能娶她，尽管我们彼此非常相爱 8. not that …but that …意为“不是因为…而是因为

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

第七--when-while-as-区别及练习.

When while as区别一、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伤了。 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。 I always listen to the radio while I’m driving. 我总是一边开车一边听收音机。 He didn’t 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。但是，若主句和从句所表示的两个同时进行的动作含有“一边……一边”之意时，则习惯上要用as。如： He swung his arms as he walked. 他走路时摆动着手臂。 3、“主长从短”型：即主句是一个持续性动作，而从句是一个短暂性动作，此时可以用as 或when，但不能用while。如： It was raining hard when [as] we arrived. 我们到达时正下着大雨。二、根据主句与从句动作是否同时发生来区分 1、若主句与从句表示的是两个同时发生的短暂性动作，含有类似汉语“一……就”的意思，英语一般要用as (也可用when)。如： The ice cracked as [when] I stepped onto it. 我一踩冰就裂了。 2、若主句与从句表示的是两个几乎同时发生的短暂性动作，含有类似汉语“刚要……就”“正要……却”的意思，英语一般要用as(也可用when)，且此时通常连用副词just。如： I caught him just when [as] he was leaving the building. 他正要离开大楼的时候，我把他截住了。三、根据是否具有伴随变化来区分若要表示主句动作伴随从句动作同时发展变化，有类似汉语“随着”的意思，英语习惯上要用as，而不用when或while。如： The room grew colder as the fire burnt down. 随着炉火逐渐减弱，房间越来越冷。注：若不是引导从句，而是引出一个短语，则用with，不用as。如： With winter coming on, it’s time to buy warm clothes. 随着冬天到来，该买暖和衣裳了。四、根据从句动作的规律性来区分若暗示一种规律性，表示“每当……的时候”，英语一般要用when。如： It’s cold when it snows. 下雪时天冷。五、根据主从句动作的先后顺序来区分若主句与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。

and,_but_or用法归纳[1]

◇“和”，连接两个名词，代词或两个形容词等语法作用相同的词语。但否定句中用or。但如果前后名词都用no修饰，则可以用and。 The air was so warm and bright. It has no feet or legs. It has no eyes and no ears. I have no sister or brother. ◇“然后”。用于连接两句有时间上先后的句子。 She washed the dishes and dried them. ◇表示目的，意图。用于go, come, stop, run, stay等动词后。 Come and have a drink. Go and buy one. ◇“只要……就会……”“如果……那么……”，用于祈使句后，表示条件与结果的关系。Knock on the door, and it will be opened. Come late again, and you’ll be fired. but ◇但是，可是，而，却。 He is in poor health, but he still kept working. ◇用在表示歉意的话后，引起一个分句，这个but通常不译成汉语。 Excuse me, but can you tell me how to get to the railway station? ◇不与although/though (“虽然，尽管”)连用。 Though he is old, he works hard. He is old, but he works hard. ◇作介词，表示“除了……之外”。 She did nothing but watch TV. or ◇“一般疑问句+ or+被选择的部分”构成选择疑问句。 Do you like apples or pears? Would you like tea or coffee? ◇“祈使句+or +陈述句”，表示“……，否则，……” Hurry up, or you will be late. Work hard, or you cannot pass this exam.

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

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第七--when-while-as-区别及练习.

and,_but_or用法归纳[1]

While的用法