when和while引导的时间状语从句有什么区别，怎样区别使用它？ 时间状语从句中when和while的区别
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\u4f8b\u53e5\uff1aWhen the teacher came in,we were talking.
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2\u3001while \u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u4e2d\uff0c\u8c13\u8bed\u52a8\u8bcd\u5fc5\u987b\u662f\u6301\u7eed\u7684\u3002
\u4f8b\u53e5\uff1aWhile he walked along the river, he heard a young boy calling "help".
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\u4f8b\u53e5\uff1aWhen the movie ended, all of the people went home.
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2\u3001while\u53e5\u5b50\u4e2d\u52a8\u4f5c\u4e0e\u4e3b\u53e5\u4e2d\u8c13\u8bed\u52a8\u4f5c\u4e00\u5b9a\u662f\u540c\u65f6\u53d1\u751f\uff0c\u6709\u65f6\u5f3a\u8c03\u4e0e\u4e3b\u53e5\u8c13\u8bed\u52a8\u4f5c\u7684\u5bf9\u6bd4\u3002
\u4f8b\u53e5\uff1aI was doing my homework while my mother was cooking.
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\u4e09\u3001\u65f6\u6001\u4e0d\u540c
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\u4f8b\u53e5\uff1aI was doing my homework when my mother came back home yesterday evening.
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2\u3001while\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u591a\u7528\u8fdb\u884c\u65f6\u6001\u3002
\u4f8b\u53e5\uff1aWhile they were talking , the bell rang.
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1\u3001when\u548cwhile\u5f15\u5bfc\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u65f6\uff0c\u90fd\u53ef\u4ee5\u8868\u793a\u201c\u5f53\u2026\u2026\u7684\u65f6\u5019\u201d\uff0c\u4f46when\u540e\u9762\u80fd\u63a5\u201c\u65f6\u95f4\u70b9\u201d\u548c\u201c\u65f6\u95f4\u6bb5\u201d\uff0c\u4e5f\u5c31\u662f\u77ed\u6682\u6027\u52a8\u4f5c\u548c\u5ef6\u7eed\u6027\u52a8\u4f5c\uff0cwhile\u53ea\u80fd\u63a5\u201c\u65f6\u95f4\u6bb5\u201d\uff0c\u4e5f\u5c31\u662f\u53ea\u80fd\u63a5\u5ef6\u7eed\u6027\u52a8\u4f5c\u3002
\u5982\uff1a
Sorry,I was out when you called me last night.
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Don't talk while/when you're watching a movie.
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\u4ee5\u4e0a\u4f8b\u53e51\uff0c\u53ea\u80fd\u7528when\uff0c\u56e0\u4e3acall\u8fd9\u4e2a\u52a8\u8bcd\uff0c\u662f\u77ed\u6682\u6027\u52a8\u4f5c\uff1b\u4f8b\u53e52\u4e24\u8005\u90fd\u53ef\u4ee5\u7528\uff0c\u56e0\u4e3awatch a movie\u662f\u4e00\u6bb5\u8f83\u957f\u7684\u65f6\u95f4\u3002
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\u5982\uff1a
I was writting when she walked into my room.
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My mother is cooking while my father is cleaning.
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3\u3001\u4ece\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u4e0d\u540c\u3002while\u4ece\u53e5\u540e\u9762\u7684\u8c13\u8bed\u52a8\u8bcd\u4e00\u822c\u7528\u8fdb\u884c\u65f6\u6001\uff0c\u800cwhen\u5219\u4e0d\u4e00\u5b9a\u3002
I was watching TV when my mom walked in.
My mom walked in while/when I was watching TV.
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您好，when 和 while 引导的时间状语从句最大的区别在于其可用的时态：
1）while 作为连词时，通常使用（持续性）动词，或是（进行时态）；所以 whiel 通常用来表达两种概念：
a）ongoing（持续性）
b）"during the time"（在……期间）
比如：
While he was talking, he was holding his baby.
（当他说话时，他抱着他的宝宝。【（说话）的动作是持续性，而（抱着）也是持续性，两个持续性重叠了一段时间】）
While he was talking, his baby slept.
（在他说话的时候，他的宝宝睡着了。【（说话）的动作是持续性，而（睡着）也是持续性动作，两个持续性重叠了一段时间】
2）when 作为连词时，除了可以使用 while 的（持续性）动词，或是（进行式）时态，更多的时候用在（间接性）或是（瞬间性）动词，或是（一般式）时态；所以 when 通常用来表达两种概念：
a）short interruption（短暂中断）; "at the moment"（此刻……）
b）series of events（一连串的事件)；"immediately after"（紧接着……）
比如：
When you called, he was watching his baby.
（当你打电话时，他正在看着他的宝宝。【（看）是持续性动作，和（打）的短暂性动作重叠了】）
When you called, he picked up his cell phone.
（当你打电话时，他拿起了他的手机。【（打）和（拿）是一前一后的动作】）
不过需要注意的是 while 可以是并列连词用于连接两个普通的句子，也可以用来引导让步状语从句的；此时时态就没有 while 引导时间状语从句的限制了。
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