过去进行时中“when和while讲解与练习

过去进行时中“when和while讲解与练习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+yesterda y (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：

1）I was taking a walk when I met him.

我正在散步，突然遇见了他。

2）We were playing outside when it began to rain.

我们正在外边玩，这时下起雨来了。

过去进行时和一般过去时的用法比较：

1）过去进行时表示过去正在进行的动作，而一般过去时则表示一个完整的动作。

例如：They were writing letters to their friends last night.

昨晚他们在写信给他们的朋友。（没有说明信是否写完）

They wrote letters to their friends last night.

他们昨晚写了信给他们的朋友。（表达了他们已写好的意思，整个写的

过程已完成。）

2）当动作延续较长时间时或表示厌烦、赞美等感情色彩时，常用过去进行时表示。

He was thinking more of others than of himself.

他考虑别人的比考虑自己的多。（表示说话者赞扬的口气）

The boy was always making trouble then.

那时，他总是惹麻烦。（表示说话者厌烦的口气）

3. 状语从句:

在复合句中，修饰主句的动词,形容词或副词等的从句叫做状语从句。状语从句根据它表达的意思可分为时间、原因、条件、比较、目的、结果和让步等类型。

(根据考试说明,前四个要求掌握,其它要求理解)

时间状语（常由下列从属连词引导）

when, as ,while (当……时候；一边…… 一边……；在……期间)，

before(在……之前)，after (在……之后)，as soon as（一…… 就…… )

since (自从……时起到现在)，till/until (直到……时) 等

例如：

1）When my cousin came yesterday, I was playing volleyball.

昨天我表哥来的时候，我在打排球。

2）When the air moves, it is called wind.

空气流动，就产生风。

3）As the boys walked along the lake, they sang happily.

这些男孩一边沿湖边走，一边愉快地唱歌。

4）While I was sleeping, the UFO arrived.

当我在睡觉时，UFO到达了。

when和while引导时间状语从句的区别：

when表示“当……的时候”。从句中既可用延续性动词，又可用非延续性动词，这些动词既可以表示动作，又可表示状态。从句中的动作既可和主句的动作同时发生，又可在主句的动作之前或之后发生。

例如：Mary was having dinner when I saw her.

The boy was still sleeping when his mother got home yesterday morning.

When the teacher came in, the students stopped talking.

while表示“在……的时候”、“在……期间” 、“一边……一边……”。while从句中必须是表示动作或状态的延续性动词。它强调主句的动作与从句的动作同时发生或主句的动作发生在从句的动作过程中。

例如：The weather was fine while we were in Beijing.

She called while I was out.

I was drawing while my brother was reading.

He likes reading a newspaper while he is waiting for the bus.

如果主句的动作在从句的动作过程中发生，从句常用进行时。

例如：While we were swimming, someone stole our clothes.

Don't talk so loud while others are working.

有时when 和while 可以转换使用。

例如：The girl was watching TV when the alien got in.

when和while引导的时间状语从句与这一时态连用。所以区别when和while的用法成了这一单元的难点。

（一）、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。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。

2、Were you writing when the teacher came in?

老师进来的时候，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。

（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。

2、You c an’t do your homework while 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的区别还在于：while引导的时间状语从句多用进行时态，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 mother came back home yesterday evening. 昨天晚上妈妈回家的时候，我正在做家庭作

通过观察，我们可以这样理解：when引导的从句里动作发生的时间相对主句动作发生的时间要短些；while引导的从句里的动作发生的时间相对主句而言更长些。

引申讲解：

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 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。

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。

3．当主句、从句动作同时进行，从句动作的时间概念淡化，而主要表示主句动作发生的背景或条件时，只能用as。这时，as常表示“随着……”；“一边……，一边……”之意。

①As the time went on，the weather got worse．（as表示“随着……”之意）

②The atmosphere gets thinner and thinner as the height increases．

随着高度的增加，大气越来越稀薄。

③As years go by，China is getting stronger and richer．

随着时间一年一年过去，中国变得越来越富强了。

④The little girls sang as they went．小姑娘们一边走，一边唱。

⑤The sad mother sat on the roadside，shouting as she was crying．

伤心的妈妈坐在路边，边哭边叫。

4．在将来时从句中，常用when，且从句须用一般时代替将来时。

①You shall borrow the book when I have finished reading it．在我读完这本书后，你可以借阅。

②When the manager comes here for a visit next week，Ill talk with him about this．下周，经理来这参观时，我会和他谈谈此事。

三、when用于表示“一……就……”的句型中（指过去的事情）。

sb．had hardly（＝scarcely）done sth．when．．．＝Hardly ／Scarcely had sb．done sth．when．．．

①I had hardly ／scarcely closed my eyes when someone knocked at the door．＝Hardly ／Scarcely had I closed my eyes when someone knocked at the door．我刚一闭上眼，就有人在敲门了。

②I had hardly ／scarcely entered my room when the telephone rang．＝Hardly ／Scarcely had I entered my room when the telephone rang．

我刚一走进房门，电话就响了。

When\while\as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。

翻译练习题

1．昨天这个时候你们英语老师在做什么？她在和一些家长谈话吗？

2．当我离开的时候他正在画一幅世界地图。

3．当你看见他们的时候他们在干什么？他们在打扫教室。

4．那时二班的学生没在操场上踢足球，他们在打篮球。

5．一天，母亲下班回家的时候，约翰在写给一个朋友写信。

6．上周五一下午，学生们在干什么？他们一直在往墙上贴海报。

7．昨天这个时候，一些学生在植树,一些学生在给小树浇水。

8．老师走进教室的时候，学术们正在谈论当天的新闻。

9．老虎等猴子的时候，他听到一个声音。

10.今天上午放学的时候在下雨吗？是的，天正下着大雨。

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。

初中英语过去进行时(when-while用法)

Summary 3 Past Co nti nuous Tense 过去进行时总结 I. Defin itio n 时态含义 表示过去某一时刻或过去一段时间内正在进行的动作。 II. Time words 时间标志词 1. then, at that time, this time yesterday, at 6 o ' clock yesterday ... 2. when/ while/ (just) as 引导的时间状语从句 III. Structure 动词结构 was/ were + doing ? Whe n/ while/ (just) as 引导的时间状语从句在过去进行时态中的用法区别 1. when既可以和短暂性动词连用，也可以和连续性动词连用, 句中一般翻译为“当...... 时候” / “就在那时”。 a. Some one kno cked at the door whenI was hav ing breakfast. b. I was tak ing a bath whenthe teleph one rang. 2. while只可以和连续性动词连用 句中一般翻译成“当...... 时候”(=wheri) / “然而”(强调前后两个动作同时进行) a. He cut himself while he was shaving. b. My wife was cooking the dinner while I was working in the garden. 3. (just) as 更强调“随着”，所引导的从句动作一般与主句动作伴随着发生。 a. Just as I was ope ning the front door, the teleph one rang. b. The children were singing as they went home.

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.

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。

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：

when, while与as用法辨析

when, while与as用法辨析 1. 根据从句动作的持续性来区分 若是“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： As [When, While] she was waiting for the train, she became very im patient. 她在等火车时，变得很不耐烦。 若是“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 li sten to the radio while I’m driving.我总是一边开车一边听收音机。 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。 若是“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。 2. 根据主句与从句动作是否同时发生来区分 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。 He jumped to his feet as the boss came in. 老板一进来他立刻站了起来。 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： Just as [when] the two men were leaving, a message arrived. 就在这两个人要离开的时候，突然有了消息。 3. 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：

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。

高考英语 状语从句易混连词辨析

1．时间状语从句常见的从属连词有：(注意其汉语意义) 2．when, while, as, before, after, since, until (till) once as soon as, the moment, the minute, immediately, directly, each/every time, the first time, the last time, next time, by the time, whenever等。例如： 3．Every/Each time I was in trouble, he would come to my help. 4．I thought her nice and honest the first time I met her.注意：（1）when, while, as的区别： 5．1)when引导从句时，主从句的动作有先有后，也可以同时进行,从句的动作可以是持续性的，也可以是短暂的。如： 6．When I got to the airport, the plane had already taken off. （主先从后）（短暂性） 7．When I lived there, I used to go to the seaside on Sundays. (同时) （持续性） 8．When the movie ended, the people went back. （从先主后） 9．2)while侧重主从句动作的对比，且从句的动词必须是持续性的。如：10．While we were chatting she was looking at the time table on the wall．11．3)as引导从句时侧重主从句动作同时或几乎同时进行，从句的动作可以是持续性的，也可以是短暂的。如： 12．Sometimes I watch TV as I am having breakfast． 13．4）when和while还可以是并列连词，意思分别是“就在这时”，“然而”。如： 14．I was having a rest on the sofa when the telephone rang．15．They were surprised that a child should work out the problem while they couldn’t .注：并列连词when常用与以下句型中： ①…was/were doing…when…（正在做…突然）

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

when和while的用法和区别

when和while的用法和区别 while和when都是表示同时，到底句子中是用when还是while主要看从句和主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、若主句表示的是一个短暂性的动作，而从句表示的是一个持续性动作时，两者都可用。如：He fell asleep when [while] he was reading. 他看书时睡着了。 I met him when [while] I was taking a walk in the park. 我在公园散步时遇到了他。 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。如： 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。 3、若从句是一个短暂性动作，而主句是一个持续性动作，可以when 但不用while。如：When he came in, I was listening to the radio. 他进来时，我在听收音机。 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，一般要用when。如： I thought of it just when you opened your mouth. 就在你要说的时候，我也想到了。 至于什么是短暂性动作，什么是持续性动作，其实有个很简单的规律。就是如果是进行时态，一般是持续性的。如果是过去式，一般是短暂性动作。 对于，填写when还是while的问题，通常首先看主句和从句中的时态，再根据以上4个规律来判断填写那个单词。 When和While的区别 通常when 后面接一般过去时while 后面接过去进行时 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.

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,as的区别

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(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 are there, can you get me some stamps? 当你在邮局时，能帮我买几张邮票吗? 若主句与从句表示的是两个几乎同时发生的动作，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。且此时，从句一般用进行时，主句用短暂性动词的一般时态。【注意与六区别】 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。 Just as [when] the two men were leaving, a message arrived. 就在这两个人要离开的时候，突然有了消息。 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 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 me ssage. 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。 I couldn’t remember a story to tell the children, so I made one up as I went along. 我想不出有什么故事可给孩子讲了，只好现编现讲。 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a s或when，但不能用while。如：

when和while区别及专项练习-含答案

用法区别专项练习和whilewhen三、完成下面句子，词数不限 1.飞机在伦敦起飞时正在下雨。讲解三例句： It when the plane 1. The girls are dancing while the boys are singing. in London. 2.2. Kangkang'你记得汶川大地震时你在做什么吗？s mother is cooking when he gets home. Do you remember what you 3. When/While Kangkang's mother is cooking, he gets home. when Wenchuan Earthquake . 3. 当铃声想起的时候，我们正在操场上玩得很开心。一、用when或者while填空We on the playground when the bell . 1.______ Margo was talking on the phone, her sister walked in. 4.2.______ we visited the school, the children were playing games. 当妈妈下班回家时，你在做什么？ 3.______ Sarah was at the barber's, I was going to class. when Mum from work? 5.4.______ I saw Carlos, he was wearing a green shirt. 当我在做作业时，有人敲门。 I was doing my homework, someone the door. 5.______ Allen was cleaning his room, the phone rang. 6.当外星人正在买纪念品的时候，那个女孩报了警。 6.______ Rita bought her new dog; it was wearing a little coat. 7. He was driving along ________ suddenly a woman appeared. the alien was buying the souvenirs, the girl the police. 8. _____ Jake was waiting at the door, an old woman called to him. 9. He was reading a book ______suddenly the telephone rang. 答案：10. ______ it began to rain, they were playing chess. 1.while 2.when 3.while 4.when 5.while 6.when 7.When 8.While 9.When 10.When 二、用所给动词适当形式填空 11.was looking ,saw 12.were playing,began 13.arrived, were talking 14.was sleeping, 11. While Jake __________ (look) for customers, he _______ (see) a woman. stole15..was,sleeping 12. They __________ (play) football on the playground when it _____ (begin) to rain. got 16.was cooking, was washing 17.was sweeping,left 18,was reading,knocked 13. A strange box ________ (arrive) while we _________ (talk). 19,doing 20.to keep 21. to see 22.were playing 14. John ____________ (sleep) when someone __________ (steal) his car. 1. was raining, took off (sleep) when I 15. Father still (get) up yesterday morning. 2. were doing ,took place (cook) breakfast while I (wash) my face this morning. 16. Grandma 3. were having fun, rang 17. Mother (sweep) the floor when I (leave) home. 4. what were you doing ,came back home 18. I (knock) at the door. (read) a

When while as的区别和用法(综合整理)

When while as的区别和用法 when的用法 当主句使用持续性动词时. Dave was eating,when the doorbell rang.门铃响时,大卫在吃饭. 2.一个动作紧接着另一个动作发生. When the lights went out, I lit some candles.灯灭了,我赶紧点上一些蜡烛. 3.谈论生命中的某一阶段,或过去的某段时间. His mother called him Robbie when he was a baby. 在他很小时,他妈妈叫他Robbin. 4.指"每一次" When I turn on the TV, smoke comes out the back. 每当我打开电视,就有烟从后面冒出. while/as 的用法 从句多为进行时,而且为持续性动词. I'll look after the children while you are making dinner. 你做饭,我来照顾孩子. 注意事项: (1) “主短从长”型：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。 Jim hurt his arm while［when，as］he was playing tennis. 吉姆打网球时把手臂扭伤了。 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。 (2) “主长从长”型：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。 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：

辨析while, when, as 配套练习

辨析while, when, as 配套练习 1. 用while, as或when填空。 _____spring comes round, warm and cheerful, shall we meet again? 解析： 填When。句意为：句意：当春天再来时，天气温暖令人愉快，我们再见面好吗？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。所以填When。 2.用while, as或when填空。 _____ the roses are yet in bloom, will you come with me to see them? 解析： 填While。句意为：趁玫瑰花还开着，你和我一起去看看好吗？while可以表示“趁着”，所以填While。 3. 用while, as或when填空。 _____ spring warms the good earth, all flowers begin to bloom. 解析： 填As。句意为：句意：随着春天送暖，大地复苏，各种花儿开始盛开怒放。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。所以填As。 4. 用while, as或when填空。 If you don’t work hard _____ you are young, you may regret _____ you are old. 解析： 填while; when。句意为：如果你不趁着年轻时努力，当你年老时，你会后悔的。第一个空表示“趁着”，填while；第二个空表示动作不是同时发生，而是有先后顺序时，一般要用when。 5.用while, as或when填空。 He was driving along ____ suddenly a woman appeared. 解析： 填when。句意：他正在开车，突然一个女人出现了。when可用作并列连词，表示“这时(突然)”，所以填when。

when和while的用法

when和while的用法 when, while这两个词都有"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, Miao Kiukun broke in.在我睡觉时,MIAO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。

When, while, as的区别和用法

When, while, as的区别和用法 版本一 (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，我默不做声。 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。