when和while的区别是

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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。

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?Sorry,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。

Strike 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。

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。

when 与while的区别

when 与while的区别

when 与while的区别1. when指某个时间点,表示瞬间动作;while 指某个时间段,表示延续性动作。

如:用when引导的状语从句表示时间,说明一个动作发生的时候,另一个动作正在进行。

如:—What were you doing when I came into the classroom? 当我走进教室的时候你正在干什么?—I was reading. 我正在读书。

—What was he doing when I came in? 当我进来的时候他正在干什么?— He was watching TV.他正在看电视。

When I got there, she was playing the violin. 我到那里时,她正在拉小提琴。

用when引导的时间状语从句也可以表示某一个动作已发生,另一个动作已经完成,已经完成的主句的动作用过去完成时态来体现。

When they arrived at the station, the train had left.当他们到达车站的时候,火车已经离开了。

用while连接的时间状语从句一般用过去进行时,表示正在进行某一个动作时发生了另一个动作,而主句常用一般过去时。

While I was playing the violin, he came to see me.我正在拉小提琴时,他来看我了。

While he was reading, the telephone rang. 当他正在读书的时候,电话铃响了。

While we were boating on the lake, we saw a fish jump out of the water.当我们正在湖中划船时,我们看见了一条鱼跳出了水面。

注意:英语中,延续性动作是由延续性动词发出的,瞬间性动作是由非延续性动词发出的。

延续性动词和非延续性动词的区别:延续性动词是指该动作可以延续一段时间,而不是瞬间结束,如work(工作)、study(学习)、eat(吃)、watch(观看);非延续性动词是指该动作极为短暂,瞬间便会结束,如start(开始)、begin(开始)、hit(撞)、see(看见)、knock(敲)、jump(跳)。

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。

when和while的区别

when和while的区别

when和while的区别when 当什么时可表瞬间事情可同时或者先后发生例子it was snowing when we got to the airport 我们到机场时天在下雪(先后顺序)while 用于相伴发生的同时进行例子some students were reading while others were writing有些学生在读书有些在写.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。

中考英语when和while的用法和区别

中考英语when和while的用法和区别

中考英语when和while的用法和区别when和while的区别一:when 当......之时(时间点),后接短暂性瞬间动词when在.....期间(时间段),后接延续性动词while在......期间(时间段),后接延续性动词因此,when可后接短暂性或延续性动词,而while只能接延续性动词。

后接短暂性终止性瞬间动词时,常用when,不用while;后接延续性动词时,when和while 常可替换使用;I was reading when you came in.当你进来的时候,我正在看书。

came是短暂性动词,此处when不能用while代替You came in while I was reading.= You came in when I was reading.read是延续性动词,此处when可用while代替when和while的区别二:1.表示正在做某事的期间,发生了意料之外的另一个短暂的动作,要对比这两件事,常用:主句(过去进行时-持续性动词),when从句(一般过去时-短暂性动词)We were playing games happily when we heard a cry.我们正在高兴地玩游戏的时候,(突然)听见了一声大叫。

2.若主句和从句的动作都比较长,表示同时发生,更常用while,此时可用进行时态或一般时态He waited in the car while l was in the shop.当我在店里的时候,他在车里等着。

He was watching TV while I was writing.当我在写作的时候,他正在看电视。

when和while的区别三:1.when可表示表示某个动作发生结束后紧接发生另一个动作,而while则不可When the bell rang, John went out of the classroom.铃声响后,约翰走出教室。

when和while的区别

when和while的区别

when和while的区别一)、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。

例如: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。

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,我正在做家庭作注意:1) 如主句谓语动词表示的是短暂动作,从句时间状语指一段时间,when while as 三者可通用。

例如:Peter came in while /as I was watching TV.当Peter进来的时候我正在看电视。

When和while的区别

When和while的区别

When while 的区别和用法(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,二者都可用:He fell asleep when |while he was reading. 他看书时睡着了。

(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。

(3) 若从句是一个短暂性动作,主句是一个持续性动作,可用when但不用 while: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,用 when:I thought of it just when you opened your mouth. 就在你要说的时候,我也想到了。

(5) 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。

(6) 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。

(7) 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)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。

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(说明:表示时间段,从句用进行时;表示时间点时,从句用一般过去式或一般现在时。

如:1)While / When I was having supper at six last night, someone knocked at the door(敲门)2) When you leave the room, please turn off the lights.);而while从句中的动词必须是延续性动词。

②when 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;而while引导的时间状语从句用过去进行时, 主句用一般过去时;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:1) . 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.2). They were singing while we were dancing..3) Tom was waiting for a bus while he was reading a newspaper ta this time yesterdar.‘as, when, while的区别as, when, while都表示主、从句的动作或状态同时发生,但三者意义不尽相同。

when-和while的用法区别

when-和while的用法区别
when的胃口大,while的胃口小
意思是,when 既可以跟终止性动词,又可以跟延续性动词.而while只能跟延续性动词(一般是进行时)
Eg:Iwas doing my homework when Tom called me。call 是短暂性的动作,所以不能用while
I was washing the dishes while/when Lily was cooking.cook是延续性的,所以when和while都行。这就是为什么,when的胃口大,while 的胃口小
when和while的区别
①when可以和时间点,一段时间连用;
While和一段时间连用
when可以和终止性动词,或延续性动词连用
while只能和延续性动词连用
终止性动词:come ,go ,close ,open ,die ,stop,see,hear,finish,leave,borrow,lend,move fall,start,sit,call
②when主从句的动作可以是同时或先后发生;
while则强调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,从句用一般过去时;while的从句和主句的动作同时发生,两句都用过去进行时
a.Whenthe teachercamein, wewere talking dancing。
④when和while 还可作并列连词.when表示“正在那时”;
while表示“而,却”,表对照或转折。Eg:The childrenwere runningto move the bag of ricewhentheyheardthe sound of a motor bike.
Eg:He is strongwhilehis brother is weak。

when和while的区别

when和while的区别

while和when的区别一、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。

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。

while与when有区别的

while与when有区别的

while与when有区别的。

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。

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。

下面是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。

)Meimei watched TV while she ate her supper.(梅梅边吃晚饭边看电视。

)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。

while和when的区别

while和when的区别

While和when的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。

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 arrivedwhen he diedwhen,while强调动作同时发生过去进行时:在过去的某一点时间, 或者是过去某一动作同时发生的另外一个动作瞬间动词(arrive)无进行时态I am arriving 进行时态表示将要When he arrived,I was having dinner.同时发生的两个动作, 均用过去进行时When I was doing my homework,my mother was cooking.When my mother was doing the housework,my father was watching TV.同时发生的两个动作1.一个用一般过去时, 另一个用过去进行时2.分工的情况, 均用过去进行时When the plane arrived,...were waiting inside the main buildingwhile others were waiting on...While......were keeping guard at the door,two others opened the parcel.表面上是分工, 两个动作同时发生, 不是同时开始同时结束, 延续时间不一致,长一点时间的动作用进行时态, 短时间的动作用过去时.When someone knocked at the door,I was having dinner.when和while引导的时间状语从句与这一时态连用。

when 和while的用法区别

when 和while的用法区别

when 和while的用法区别when和while是英语中两个常见的连词,它们在句子中的使用有一些区别。

下面就来详细介绍一下它们的用法区别。

一、时间状语从句中的用法:1. when:表示“当……的时候”,引导的时间状语从句中的动作与主句的动作同时或几乎同时发生。

例句:I always feel sleepy when I listen to classical music.(当我听古典音乐的时候,我总是感到困倦。

)2. while:表示“在……的时候”,引导的时间状语从句中的动作与主句的动作同时发生,但强调主句的动作持续时间较长。

例句:She watched a movie while her brother was studying. (她在她哥哥学习的时候看电影。

)二、连词的不同含义:1. when:除了表示时间状语从句外,还可以表示“当……的时候”、“每当”等含义。

例句:When it rains, I always stay at home.(每当下雨,我总是待在家里。

)2. while:除了表示时间状语从句外,还可以表示对比、让步、转折等含义。

例句:While I appreciate your effort, I still think you need to improve.(虽然我赞赏你的努力,但我仍然认为你需要进步。

)三、连词引导的句子结构:1. when:可以引导的从句有主语+谓语或名词性从句。

例句:When she arrived, everyone applauded.(当她到达时,大家鼓掌。

)例句:I don't know when he will come back.(我不知道他何时会回来。

)2. while:除了可以引导主语+谓语的从句外,还可以引导状语从句和让步从句。

例句:While I was reading, the phone rang.(我在看书的时候,电话响了。

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。

when和while的区别

when和while的区别
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的区分还在于:while 引导的时间状语从句多用进展时态,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
〔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 语动词只能是连续性的,而且也只能与主句中的 谓语动词同时发生或存在。
例如: 1、While Jim was mending his bike, Lin
Tao came to see him. 正值吉姆修自行车时,林涛来看他。 2、You can’t do your homework while
room. 她走进我房间时,我正在看书。 2、Were you writing when the teacher came in?
教师进来的时候,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。
正在看电视。 I was watching TV when Peter came in. 当Peter进来时我正在看
电视。
2) as 和 when 可与非连续性动词连用,而 while 只能与连续性动 词连用。
例如:He came in when/ as I was going to bed.我刚要上床睡觉, 他进来了。
mother came back home yesterday evening. 昨天晚上妈妈回家的时候,我正在做家庭作

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与while的区别

when与while的区别

when与while的区别表示“当....的时候”的意思时,可以替换。

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;(指时间)while是during the time that,只指一段时间,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(指动词)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;(指动作)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。

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。

先看下面一道高考题:—I'm going to the post office.—________you're there, can you get me some stamps?A. AsB. WhileC. BecauseD. If对连词的用法考查在每年高考题中均有涉及。

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Period____8______ in Unit ___6_________ (Period_____20_____Week 4-6)Subject _Grammar (B)
Teaching aims
To use the Past Continuous Tense with while and when correctly
Teaching interesting points of this class:
The differences of when and while in Past Continuous Tense
Teaching steps:
I. Cooperation and intercourse
1. Check the preparation
2. Discuss in groups
II. Question and explanation
Check the exercises on page 101, and explain the differences between when and while.
when和while的区别是:
when只能用于一般时态
while可以用于进行时态
when conj. 在...的时候, 当…的时候
when 在绝大多数情况下,所引导的从句中,应该使用非延续性动词(也叫瞬间动词)
例如:I'll call you when I get there. 我一到那里就给你打电话
I was about to go out when the telephone rang.我刚要出门,电话铃就响了。

但是,when 却可以be 连用。

例如:I lived in this village when I was a boy. 当我还是个孩子的时候我住在这个村庄里。

When I was young, I was sick all the time. 在我小时候我总是生病
while 当...的时候
While he was eating, I asked him to lend me $2. 当他正在吃饭时,我请他借给我二美元。

While I read, she sang. 我看书时,她在唱歌。

while 的这种用法一般都和延续性动词连用
while 可以表示“对比‘,这样用有的语法书认为是并列连词
Some people like coffee, while others like tea. 有些人喜欢咖啡, 而有些人喜欢茶。

as 当...之时,一边......一边.......
I slipped on the ice as I ran home. 我跑回家时在冰上滑了一跤
He dropped the glass as he stood up. 他站起来时,把杯子摔了。

She sang As she worked. 她一边工作一边唱歌。

III. Rumination and evaluation
when, as, while这三个词都可以引出时间状语从句,它们的差别是:when 从句表示某时刻或一段时间as 从句表示进展过程,while 只表示一段时间
When he left the house, I was sitting in the garden.
当他离开家时,我正在院子里坐着。

When he arrived home, it was just nine o'clock.
当他到家时,正是九点钟。

As he grew older, he became more intelligent.
随着他年龄的增长,他变得更有才智了。

While he was in London,he studied music.
当他在伦敦时,他学习音乐。

While she was typing the letter,the telephone rang.
当她在用打字机打那封信时,电话响了。

IV. Consolidation and test
过去进行时巩固练习:
1. Simon _____________ (make) a model plane at 8:00 a.m.
2. Peter ______________(do) his homework at seven last night.
3. They ____________ (watch) a football match from 7:00 to 9:00 last night.
4. He _____________(try) to draw a plane on the blackboard at that time.
5. What book _______ you _______(read) when I _______ (see)you at four yesterday afternoon? 6. While she __________ (watch) TV, her son ____________ (play) outside the room.
7. It ________ (begin) to rain while we _____________(work) in the field.
8. I ________ (do) my homework last night when the light _______ (go) out. {go out 意外熄灭} 9.——I saw you in the reading room yesterday , Tom. What were you doing?
-----Oh, I ____________ (read) some books on science.
10. Girls ___________(dance) while boys ____________(sing) at the party.
11. --- Did you see Tim just now?
--- Yes. He __________ (fish) by the river.
12. When the teacher ______ (come) into the classroom, the students ____(laugh)loudly.
V. Guide to the preview
1. Revise the use of the Past Continuous Tense and make some sentences.
2. Discuss and make a project about natural disasters with your classmates.
教学反思:
When 与while的区别并不是通过一节课的讲解就能掌握的,要多练习才可以。

区别并不难,正确使用才是关键。

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