过去进行时、when和while引导时 间状语从句的区别

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when 和while的用法区别

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。

英语人教版八年级下册过去进行时中when和while的区别

英语人教版八年级下册过去进行时中when和while的区别

Section A 过去进行时中when 和while 的区别Step1过去进行时中的when和whilewhen和while都可表示“当……的时候”,引导时间状语从句。

你知道两者在过去进行时中的用法有什么不同吗?请仔细观察下面的例句,然后补全空格中的内容。

①I was walking to school when I saw a cat in a tree.主句的动作是持续性的,而从句动作是短暂性的,此时用_______引导时间状语从句,主句用_____________时态,从句用一般过去时态。

③While I was sleeping in the bedroom, someone knock ed at the door.④David fell(fall)while he was riding his bike.主句的动作是短暂性的,从句的动作是持续性的,此时用_________引导从句,主句用____________时态,从句用过去进行时态。

⑤While Andy was waiting for the bus, he was reading a newspaper.⑥He was cleaning his car while I was cooking.主句和从句的动作在过去的某时刻或某段时间同时发生,而且动作都是持续性的,此时用_________引导从句,而且主句和从句都用_____________时态。

Practice: 汉译英。

Step2 活学活用4a Look at the table and write sentences with both while and when.e.g. While John was taking photos , Mary bought a drink.John was taking photos when Mary bought a drink.Step 3 ExercisesI. 根据汉语意思完成下列英语句子,每空一词。

when和while时间状语从句

when和while时间状语从句

when和while时间状语从句一、when引导的时间状语从句1. 基本用法- when引导的时间状语从句,既可以表示在某一时刻发生的动作,也可以表示在某一时间段内发生的动作。

从句中的动词可以是短暂性动词,也可以是延续性动词。

- 例如:- When I got home, my mother was cooking.(got是短暂性动词,这里表示在我到家这个时刻,妈妈正在做饭)- When we lived in the countryside, we often went fishing.(lived是延续性动词,描述我们住在乡下这个时间段内经常去钓鱼的情况)2. 时态搭配- 当主句是一般将来时,从句常用一般现在时表将来。

- 例如:When he arrives tomorrow, we will have a party.(arrives是一般现在时,主句will have是一般将来时)- 当主句是过去进行时,从句用一般过去时,表示在过去某个动作进行时,另一个动作发生了。

- 例如:I was reading a book when he came in.(was reading是过去进行时,came是一般过去时)3. 位置特点- when引导的时间状语从句可位于主句之前或之后。

当位于主句之前时,从句后常用逗号与主句隔开。

- 例如:When it rains, the ground gets wet.(从句在前)- The birds fly south when winter comes.(从句在后)二、while引导的时间状语从句1. 基本用法- while引导的时间状语从句,从句中的动词必须是延续性动词,表示在某一时间段内,主句和从句的动作同时发生。

- 例如:While I was reading, my sister was watching TV.(reading和watching都是延续性动词,说明我读书和妹妹看电视这两个动作同时进行)2. 时态搭配- 当主句和从句都是过去进行时,表示两个动作在过去某一时间段内同时进行。

When和While的区别

When和While的区别

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. 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。

初中语法过去进行时及when和while的区别

初中语法过去进行时及when和while的区别

(一)定义过去进行时,是表示过去某个具体时刻正在进行的事情或动作。

(二)结构was/were +doing (现在分词)(三)用法1、过去进行时表示过去某段时间内持续进行的动作或者事情。

常用的时间状语this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while例如:We were watching TV from seven to nine last night.昨天晚上七点到九点的时候我们在看电视。

2. 过去进行时可以表示在过去某个时间点发生的事情。

时间点可以用介词短语、副词或从句来表示。

如:When I saw him he was decorating his room.当我看见他的时候他正在装饰房间。

(when从句表示时间点)3. 在复合句中,如果主要动作和背景动作都是延续的或同时发生的,那么主从句的动词都可用过去进行时。

例如:While he was waiting for the bus, he was reading a newspaper.他边等车边看报。

(两个动作都是延续的)He was cleaning his car while I was cooking.他擦车时我在做饭。

(两个动作同时进行)4. 通常不能用于过去进行时的动词主要有:agree, be, believe, belong, care, forget, hate, have(拥有), hear, know, like, love, mean, mind, notice, own, remember, seem, suppose, understand, want, wish等。

例如:误:I was knowing the answer.正:I knew the answer. 我知道答案。

状语从句的引导词及其区别

状语从句的引导词及其区别

状语从句的引导词及其区别状语从句在句中作状语,修饰主句中的动词、形容词和副词等。

按其作用和意义可分为时间、原因、目的、结果、条件、让步、方式、比较,地点九种。

下面对这九种从句的要点加以总结。

一、各类状语从句的引导词及易混词的区别。

1. 时间状语从句1) 引导词(1)表示“当……时候”:when, while, as, wheneverWhen I went into the room, he was at work. 当我进屋时,他在工作。

While it was raining, they went out. 正在下着雨时,他们出去了。

Whenever he comes, he brings a friend. 他每次来都带个朋友。

(2)表示“一……就……”:as soon as, the moment/minute/instant, immediately/directly/instantly , hardly/scarcely…when, no sooner…than I’ll tell you the news the moment you come.你一来我就告诉你那个消息。

The machine will start instantly you press the button. 你一按按钮机器就会开动。

Hardly/Scarcely had I got to the cinema when the film began. 我一到电影院,电影就开始了。

I had no sooner reached home than it began to rain.我一到家天就下起了雨。

(3)其它:after, before, since, until, by the time,each time, next timeThe boy went to bed after he finished my homework. 那男孩做完家庭作业之后才睡觉。

8B过去进行时when,as和while的区别.

8B过去进行时when,as和while的区别.

• 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 phonecall,I was writing a letter.(make为延续性动词)当她在打电 话时,我正在写信。
while连接的句子,后面必须用进行时(现在/ 过去进行时) 1) A car hit her while she was thinking about a question. 2) The books fell off from the shelf while they were listening to the radio. 3) While we are playing football, a noise comes from downstairs.
• 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。

when和while的用法和区别

when和while的用法和区别

when和while的用法和区别When 和 While 的用法和区别在英语学习中,when 和 while 这两个词都是用来引导时间状语从句的,但其用法和所表达的含义却有所不同。

理解它们的用法和区别对于我们正确使用英语、准确表达时间关系至关重要。

首先,我们来看看 when 的用法。

When 既可以表示“在……时候”,也可以表示“就在这时”。

当 when 表示“在……时候”时,它所引导的从句中的动作可以是瞬间性动作,也可以是持续性动作。

比如:“When I was a child, I often played in the park”(当我还是个孩子的时候,我经常在公园玩耍。

)在这个句子中,“was a child”是持续性动作。

再比如:“When the bell rang, we all stopped talking”(当铃声响起时,我们都停止了讲话。

)这里“rang”就是瞬间性动作。

而当 when 表示“就在这时”时,通常用于以下结构:“be doing sth when”(正在做某事,就在这时……)或者“be about to do sth when”(正要做某事,就在这时……)。

例如:“I was walking along the street when it began to rain”(我正在街上走着,就在这时开始下雨了。

)“I was about to leave when the phone rang”(我正要离开,就在这时电话响了。

)接下来,我们看看 while 的用法。

While 通常表示“在……期间”,强调主句和从句的动作在同一时间段内同时发生,并且从句中的动作通常是持续性的。

例如:“While I was doing my homework, my mot her was cooking dinner”(当我在做作业的时候,我妈妈正在做晚饭。

)在这个句子中,“was doing my homework”和“was cooking dinner”是同时进行的持续性动作。

when 和while的用法区别

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。

具体你可以参考这一段。

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。

when和while的区别

when和while的区别

when和while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。

具体你可以参考这一段。

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 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。

when和while的用法区别

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。

when与while引导时间状语从句的区别

when与while引导时间状语从句的区别
过去进行时 (一)含义及构成
过去进行时表示过去某一时刻或某一 段时间正在进行或发生的动作,其结构为: was / were + v. –ing。
I/He/She/It was +v-ing… (第一三人称单 数用was) We/You/They +v-ing…
(1)过去进行时的否定句结构为:was / were+ not +v. -ing ,was与not常缩写 为wasn’t,were与not常缩写为weren’t。
(2)过去进行时的一般疑问句结构为: Was / Were +主语+ v. -ing+其他?
(3)过去进行时的特殊疑问句结构为: 疑问词+ was / were+主语+v. -ing+其他?
(二)用法 1. 表示过去某一时刻或某一段时间
正在进行或发生的动作。与过去某一特 定的时间状语连用,常见的有:at 3
o’clock yesterday afternoon, in those days, at this time yesterday等。
2. 表示过去一个动作发生时,另一 个动作正在进行,持续时间长的动作用 过去进行时,用法
Ⅰ. 用所给词的适当形式填空 1. I _w_a_s__h_e_lp_i_n_g(help) my mother with housework at ten o’clock last Sunday.
3. They were having a party when I
knocked at the door. (就划线部分提
问W)hat were
doing
______ ______ they ______ when

When和While的区别

When和While的区别

When和While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。

when和while引导时间状语从句的区别及用法

when和while引导时间状语从句的区别及用法

when和while引导时间状语从句的区别及用法when和while引导时间状语从句的基本区别:(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 can’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。

when与while的在状语从句区别和用法(一)

when与while的在状语从句区别和用法(一)

when与while的在状语从句区别和用法(一)When与While的区别和用法基本区别•When和while都可以引导时间状语从句,表示一个动作或事件发生的时间。

•When表示“当……的时候”,while表示“在……的时候”。

•When引导的时间状语从句一般提供背景信息,描述一个已经发生或将要发生的事件。

•While引导的时间状语从句一般用于描述与主句同时发生的事件。

When的用法1. 表示单个动作或事件的时间•主句一般使用延续性动词。

•When引导的时间状语从句可以放在主句之前或之后。

•例如:–When I arrived at the station, the train hadalready left.–I was working on my computer when the powersuddenly went out.2. 表示经常性的动作或事件•主句一般使用一般现在时。

•例如:–When it rains, I usually stay at home.–I always feel sleepy when I study late at night.3. 表示状态的时间•主句一般使用非延续性动词。

•例如:–She was very tired when she woke up.–When he heard the news, he was overjoyed.While的用法1. 表示同时发生的动作或事件•主句和时间状语从句之间的动作或事件在时间上重叠。

•例如:–While I was cooking dinner, my friend called me.–She was reading a book while waiting for the bus.2. 表示递进关系•常用于含有递进关系的复合句中。

•常与“on the one hand…on the other hand”或“however”等连词连用。

过去进行时之when_和while的区别

过去进行时之when_和while的区别
cat in a tree. ②When Sally arrived home, her mother
was cleaning the house. 主句的动作是持续性的,而从句动作
是短暂性的,此时用 _w__h_en__ 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。
When Jim called him up, he was sleeping.
A
6
While Tom walked to school
While Tom walked to school, he was eating.
A
7
A
8
(一)
① I was walking to schooTV when my mother ___ (come) in.
3. He____ (do) his homework at 9 this morning.
4. The children_______ (play) soccer at 4 yesterday
afternoon.
A
13
when 和 while用法小结
主句和从句的动作在过去同时发 生,而且动作都是持续性的, 此时 用 while 引导从句,而且主句和从句都 用 过去进行 时态。
A
14
Homework
Fill in the blanks. 1. What ____ you ____ (do) at 9 yesterday?
A
10
(三)
⑤ While Andy was waiting for the bus, he
was reading a newspaper.
⑥ He was cleaning his car while I was

when和 while的区别

when和 while的区别

when和while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。

具体你可以参考这一段。

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。

when和while的区别

when和while的区别

when和while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。

具体你可以参考这一段。

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。

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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:
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。

例如: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.。

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