初二英语涉及when,while的适当形式填空
\u521d\u4e8c\u82f1\u8bed\uff08\u7528"when"\u6216"while"\u586b\u7a7a)while
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They were eating dinner when someone knocked at the door just now.
I met an old friend while I was walking in the street one hour ago.
The TV caught fire while they were working yesterday.
2.was cooking ; am washing （延续性动作）
while 一般跟延续性动作,用进行时。
我们老师归结一句好记的话：when的胃口大，while的胃口小
意思是，when 既可以跟短暂动作，又可以跟延续性动作。而while只能跟延续性动作（一般是进行时）
例句：
i was 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。
Was sleeping ;got
was cooking;was washing
when后面既可以加可持续性动词也可以加不可延续性动词，而while后只能加可延续性动词，并且通常用进行时。sleep、cook、wash是可延续性动词，get up是不可延续性动词，用我们老师的话来说，你还能起床起上一个小时啊，所以说起床时瞬间动作，像pay、cost等都是非延续性动词。
希望能够帮到你。
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