请问while引导的从句是跟过去式还是过去进行时 区别在过去进行时当中when和while的用法？
while\u5f15\u5bfc\u7684\u4ece\u53e5\u662f\u8ddf\u8fc7\u53bb\u5f0f\u8fd8\u662f\u8fc7\u53bb\u7528\u4f55\u79cd\u65f6\u6001\u5173\u952e\u770b\u4f60\u8868\u8fbe\u7684\u52a8\u4f5c\u65f6\u95f4\u3002\u4e0d\u8fc7while\u5f15\u5bfc\u7684\u72b6\u8bed\u4ece\u53e5\u4e0d\u7528\u5c06\u6765\u65f6\uff0c\u7528\u4e00\u822c\u65f6\u53d6\u4ee3\u3002
While you cross /are crossing the street, you should be careful.\u4f60\u8fc7\u9a6c\u8def\u65f6\u8981\u5c0f\u5fc3\u3002
While the numbers of such developments are relatively small, the potential market is large. \u5c3d\u7ba1\u8fd9\u79cd\u589e\u957f\u7684\u6570\u91cf\u76f8\u5bf9\u8f83\u5c0f\uff0c\u4f46\u662f\u6f5c\u5728\u7684\u5e02\u573a\u662f\u5de8\u5927\u7684\u3002
They were grinning and watching while one man laughed and poured beer over thehead of another. \u5f53\u4e00\u4e2a\u7537\u4eba\u5927\u7b11\u7740\u628a\u5564\u9152\u5012\u5728\u53e6\u4e00\u4e2a\u4eba\u5934\u4e0a\u65f6\uff0c\u4ed6\u4eec\u90fd\u5728\u4e50\u5475\u5475\u5730\u770b\u7740\u3002
Racing was halted for an hour while the track was repaired. \u4fee\u7406\u8d5b\u9053\u65f6\u8f66\u8d5b\u4e2d\u6b62\u4e861\u4e2a\u5c0f\u65f6\u3002
when \u548cwhile\u7684\u7528\u6cd5\u533a\u522b\u5982\u4e0b\uff1a
1\u3001when\u662fat or during the time that,\u65e2\u6307\u65f6\u95f4\u70b9,\u4e5f\u53ef\u6307\u4e00\u6bb5\u65f6\u95f4\uff1b while\u662fduring the time that,\u53ea\u6307\u4e00\u6bb5\u65f6\u95f4,\u56e0\u6b64when\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u4e2d\u7684\u52a8\u8bcd\u53ef\u4ee5\u662f\u7ec8\u6b62\u6027\u52a8\u8bcd,\u4e5f\u53ef\u4ee5\u662f\u5ef6\u7eed\u6027\u52a8\u8bcd,\u800cwhile\u4ece\u53e5\u4e2d\u7684\u52a8\u8bcd\u5fc5\u987b\u662f\u5ef6\u7eed\u6027\u52a8\u8bcd\u3002
2\u3001when \u8bf4\u660e\u4ece\u53e5\u7684\u52a8\u4f5c\u548c\u4e3b\u53e5\u7684\u52a8\u4f5c\u53ef\u4ee5\u662f\u540c\u65f6,\u4e5f\u53ef\u4ee5\u662f\u5148\u540e\u53d1\u751f\uff1bwhile \u5219\u5f3a\u8c03\u4e3b\u53e5\u7684\u52a8\u4f5c\u5728\u4ece\u53e5\u52a8\u4f5c\u7684\u53d1\u751f\u7684\u8fc7\u7a0b\u4e2d\u6216\u4e3b\u4ece\u53e5\u4e24\u4e2a\u52a8\u4f5c\u540c\u65f6\u53d1\u751f\u3002
3\u3001\u7531when\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5,\u4e3b\u53e5\u7528\u8fc7\u53bb\u8fdb\u884c\u65f6,\u4ece\u53e5\u5e94\u7528\u4e00\u822c\u8fc7\u53bb\u65f6\uff1b\u5982\u679c\u4ece\u53e5\u548c\u4e3b\u53e5\u7684\u52a8\u4f5c\u540c\u65f6\u53d1\u751f,\u4e24\u53e5\u90fd\u7528\u8fc7\u53bb\u8fdb\u884c\u65f6\u7684\u65f6\u5019,\u591a\u7528while\u5f15\u5bfc,\u5982\uff1a
a\u3001When the teacher came in,we were talking.
\u5f53\u6b64\u53e5\u6539\u53d8\u4e3b\u4ece\u53e5\u7684\u4f4d\u7f6e\u65f6,\u5219\u4e3a\uff1aWhile we were talking,the teacher came in.
b\u3001They were singing while we were dancing.
4\u3001when\u548cwhile \u8fd8\u53ef\u4f5c\u5e76\u5217\u8fde\u8bcd\u3002when\u8868\u793a\u201c\u5728\u90a3\u65f6\u201d\uff1bwhile\u8868\u793a\u201c\u800c\u3001\u5374\u201d,\u8868\u5bf9\u7167\u5173\u7cfb\u3002\u5982\uff1a
a\u3001The children were running to move the bag of rice when they heard the sound of a motor bike\u3002\u5b69\u5b50\u4eec\u6b63\u8981\u8dd1\u8fc7\u53bb\u642c\u5f00\u90a3\u888b\u7c73,\u8fd9\u65f6\u4ed6\u4eec\u542c\u5230\u4e86\u6469\u6258\u8f66\u7684\u58f0\u97f3\u3002
b\u3001He is strong while his brother is weak.\u4ed6\u957f\u5f97\u5f88\u7ed3\u5b9e,\u800c\u4ed6\u5f1f\u5f1f\u5374\u5f88\u7626\u5f31\u3002
\u6269\u5c55\u8d44\u6599\uff1a
when\u4e0ewhat time\u7684\u7528\u6cd5\u533a\u5206
what time\u5e38\u7528\u6765\u95ee\u949f\u70b9\uff0c\u800cwhen\u9664\u4e86\u95ee\u949f\u70b9\u5916\uff0c\u8fd8\u53ef\u7528\u6765\u95ee\u65e5\u671f\uff0c\u6708\u4efd\uff0c\u5e74\u4efd\u7b49\u3002 [3]
\u6709\u65f6\u4e24\u8005\u53ef\u4ee5\u6362\u7528\uff0c\u6709\u7684\u573a\u5408\u4e0d\u53ef\u4ee5\u3002
1.\u95ee\u949f\u70b9\u65f6\uff0c\u53ef\u4ee5\u6362\u7528\u3002When do you go to school?What time do you go to school?
2.\u95ee\u65e5\u671f\uff0c\u6708\u4efd\uff0c\u5e74\u4efd\u7b49\uff0c\u53ea\u80fd\u7528whenWhen were you born? I was born on July 2,1972.
3,\u5f53\u95ee\u67d0\u4e8b\u5728\u67d0\u5929\u7684\u4ec0\u4e48\u5177\u4f53\u65f6\u95f4\u8fdb\u884c\uff0c\u53ea\u80fd\u7528what timeWhat time did you call this afternoon?I called at 4:00 this afternoon.
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-when
2.有时用一般现在时和一般过去时。此时引导的是让步状语从句，while译成“而”“然而”的意思.I like football while Liudong likes basketball.我喜欢足球而刘东喜欢篮球。
一般是 进行式
例如：
I went back while he was playing football.
when和while不一样
它的一般是
I am reading book when he come in.
不过具体问题具体分析
while是一个从属连词，可以引导时间状语从句和让步状语从句。引导时间状语从句时，从句常用进行时态或连系动词。引导让步状语时，表对比，所用的时态要看主句是什么时态，从句就是什么时态。
while引导的是过去进行时，是可延续性动词
这里是While
I
was
playing
computer
game,
he
came.
表示当我在打游戏是他来了。这里的come是个瞬间动词，也就是动作发生在一瞬间，当你听到他敲你的门的时候他就到了，be
coming一般表示快要到了，是以现在时态表示将来。while在解释为当...的时候，前后两个动作是同时发生的，如：
I'm
watching
TV
while
Tom
is
doing
his
homework.
如果说：While
I
was
playing
computer
game,
he
was
coming.
那其实前面的动作发生在对当时来说的现在，而后面的动作则是对当时来说的将来，发生的时间不一致。
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