有when while 一定要用过去进行时吗 when和while有什么区别，如果句子出现这种单词，句子需...

\u6709whenwhile\u4e00\u5b9a\u8981\u7528\u8fc7\u53bb\u8fdb\u884c\u65f6\u5417

\u4e0d\u4e00\u5b9a\uff0c\u8981\u770b\u5177\u4f53\u60c5\u51b5\u3002\u82e5\u5b83\u4eec\u5f15\u5bfc\u7684\u4ece\u53e5\u52a8\u8bcd\u7684\u52a8\u4f5c\u548c\u4e3b\u53e5\u52a8\u8bcd\u7684\u52a8\u4f5c\u540c\u65f6\u53d1\u751f\u3001\u4e14\u4ece\u53e5\u52a8\u8bcd\u4e3a\u5ef6\u7eed\u6027\u52a8\u8bcd\u65f6\uff0c\u5219\u4ece\u53e5\u53ef\u4ee5\u7528\u8fdb\u884c\u65f6\u6001\u3002
When \uff0fWhile \uff0fAs we were dancing\uff0ca stranger came in\uff0e\uff08dance\u4e3a\u5ef6\u7eed\u6027\u52a8\u8bcd\uff09\u5f53\u6211\u4eec\u8df3\u821e\u65f6\uff0c\u4e00\u4f4d\u964c\u751f\u4eba\u8d70\u4e86\u8fdb\u6765\u3002
When\uff0fWhile \uff0fAs she was making a phonecall \uff0cI was writing a letter\uff0e\uff08make\u4e3a\u5ef6\u7eed\u6027\u52a8\u8bcd\uff09\u5f53\u5979\u5728\u6253\u7535\u8bdd\u65f6\uff0c\u6211\u6b63\u5728\u5199\u4fe1\u3002
when\u65e2\u6307\u65f6\u95f4\u70b9\uff0c\u4e5f\u53ef\u6307\u4e00\u6bb5\u65f6\u95f4\uff1bwhile\u53ea\u6307\u4e00\u6bb5\u65f6\u95f4\u3002\u56e0\u6b64when\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u4e2d\u7684\u52a8\u8bcd\u53ef\u4ee5\u662f\u7ec8\u6b62\u6027\u52a8\u8bcd\uff0c\u4e5f\u53ef\u4ee5\u662f\u5ef6\u7eed\u6027\u52a8\u8bcd\uff0c\u800cwhile\u4ece\u53e5\u4e2d\u7684\u52a8\u8bcd\u5fc5\u987b\u662f\u5ef6\u7eed\u6027\u52a8\u8bcd\u3002\u5982\uff1a
When the teacher came in, we were talking. \u5f53\u8001\u5e08\u8fdb\u6765\u65f6\uff0c\u6211\u4eec\u6b63\u5728\u8c08\u8bdd\u3002
When / While we were talking, the teacher came in. \u5f53\u6211\u4eec\u6b63\u5728\u8c08\u8bdd\u65f6\uff0c\u8001\u5e08\u8fdb\u6765\u4e86\u3002

when\u4e3b\u8981\u63a5\u975e\u5ef6\u7eed\u6027\u52a8\u4f5c\uff0c\u800cwhile\u4e3b\u8981\u662f\u5ef6\u7eed\u6027\u52a8\u4f5c

When可接过去时和过去进行时，While只能接过去进行时先弄清楚while和when的区别
when 当什么时 可表瞬间 事情可同时 或者先后发生
while 用于相伴发生的 同时进行的 持续性的

while 和 when在过去进行时中的用法：表示两个持续性的动作在过去同时发生用while，when后接一个短暂性的动作。持续性的动作用过去进行时,自然也就是要+ing了，短暂性的动作用一般过去时,所以不+ing.
所以是while后的动作+ing,when后的动作一般不+ing

1.I was doing my homework when someone knocked at the door.

2.We were walking along the river when suddenly it rained.

3.While he was waiting at the bus stop, the traffic accident happened.( While 后的分句必须用进行时)

4.While I was reading , my sister was sleeping.(表示对比,都用进行时)

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