when和while的用法和区别 when和while的用法区别。
while\u548cwhen\u7684\u533a\u522bas\u548cwhen\u3001while\u7684\u533a\u522b
as\u548cwhen\u3001while\u7684\u533a\u522b
"when"表示两个事件发生的时间是相互关联的，一个事件发生后另一个事件立即发生。例如：When I arrived at the airport, the plane had already taken off. （当我到达机场时，飞机已经起飞了。）I always drink coffee when I wake up. （我每天一起床就喝咖啡。）
"while"表示两个事件发生的时间是同时进行的，它们可能会重叠或者在同一时间段内发生。例如：While I was watching TV, my phone rang. （当我在看电视时，手机响了。）I listened to music while I was cleaning the house. （我在打扫房子的时候听音乐。）
总之，"when"和"while"都用来描述时间关系，但是"when"通常用于描述两个事件之间的先后关系，而"while"则通常用于描述两个事件之间的同时性。
when和while的区别为：意思不同、用法不同、侧重点不同
一、意思不同
1.when：什么时候；当 ... 时；然后；可是；当 ... 时；时间
2.while： 当 ... 的时候；虽然；尽管；然而；一段时间；一会儿
二、用法不同
1.when：用作疑问副词，用来询问某事曾发生或将要发生的时间，引导特殊疑问句；还可用作关系副词引导限制性定语从句、非限制性定语从句和表语从句，表示“是…时候的事”。
例句：
They stood respectfully when he entered the room
当他走进房间时，他们都恭恭敬敬地站着。
2.while：用作连词时，表示“在…(过程)中，在…期间”。常用来引导时间状语从句，当主句的主语和while所引导的从句的主语一致时， while从句中的主语、谓语往往可以省去。
例句：
I lived in a hostel while I was a student
我求学期间住在青年招待所里。
三、侧重点不同
1.when：指具体的时间点。
2.while：指某一段时间。
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。
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。
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。
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。
① As the time went on，the weather got worse．（as表示“随着……”之意）
② The 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和while的用法与区别 ：
1、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.
2、when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.
3、when,while引导时间状语从句的区别
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.
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.
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都可使用.
①When ／While 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 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.
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。
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。
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。
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。
① As the time went on，the weather got worse．（as表示“随着……”之意）
② The 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。
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绛旓細when鍜寃hile鐨勭敤娉曚笌鍖哄埆 锛1銆佺敱when寮曞鐨勬椂闂寸姸璇粠鍙,涓诲彞鐢ㄨ繃鍘昏繘琛屾椂,浠庡彞搴旂敤涓鑸繃鍘绘椂锛涘鏋滀粠鍙ュ拰涓诲彞鐨勫姩浣滃悓鏃跺彂鐢,涓ゅ彞閮界敤杩囧幓杩涜鏃剁殑鏃跺,澶氱敤while寮曞,濡傦細a. When the teacher came in, we were talking.褰撴鍙ユ敼鍙樹富浠庡彞鐨勪綅缃椂,鍒欎负锛歐hile we were talking, the teacher came...
绛旓細1銆佹椂闂寸姸璇粠鍙鐢ㄦ硶涓嶅悓 鍦when寮曞鐨勬椂闂姸璇粠鍙ヤ腑锛岃皳璇姩璇嶅彲浠ユ槸缁堟鎬у姩涓璇嶏紝涔熷彲浠ユ槸寤剁画鎬у姩璇; 鑰屽湪while寮曞鐨勬椂闂寸姸璇粠鍙ヤ腑锛岃皳璇姩璇嶅繀椤绘槸寤剁画鎬у姩璇嶃傦紙1锛塛e were talking when the teacher came in.閲婁箟锛氭垜浠鍦ㄤ氦璋堬紝杩欐椂锛岃佸笀杩涙潵浜嗐傦紙2锛塗hey arrived when/while we were ...
绛旓細when鍜寃hile鐨鍖哄埆鍦ㄤ簬渚ч噸鐐逛笉鍚屻鐢ㄦ硶銆佽瘝婧愯В璇淬佷竴璇嶅涔夈備竴銆佷晶閲嶇偣涓嶅悓 1銆亀hen鎵寮曞鐨勪粠鍙ワ紝鍏惰皳璇姩璇嶆棦鍙槸鎸佺画鍔ㄨ瘝锛屼篃鍙槸鐭殏鍔ㄨ瘝锛涜皳璇姩璇嶅姩浣滃彂鐢熺殑鏃堕棿鍙互涓庝富鍙ヨ皳璇姩璇嶇殑鍔ㄤ綔鏄悓鏃讹紝鎴栦箣鍓嶃佷箣鍚庛2銆亀hile鍙ヤ腑鐨勮皳璇姩璇嶅簲涓烘寔缁姩璇嶏紝涓嶇敤鐭殏鍔ㄨ瘝锛岃皳璇姩浣滃彂鐢熺殑鏃堕棿閫氬父涓庝富鍙...
