While the alien ____ a souvenir ,the girl called the police

来源：学生作业帮编辑：灵鹊做题网作业帮分类：英语作业时间：2024/05/12 22:47:16

While the alien ____ a souvenir ,the girl called the police .A.was buying B bought
为什么选A,如果换成是用when引导,这句话等于什么,请详解,

此题考察过去进行时态,以及while在引导时间状语从句时的用法,原句想表达意思为：
当艾伦正在购买纪念品时,就在那个时态有个女孩报了警.
（此事发生在过去,另外,while在这里表示同时进行的动作,常接延续性动词,这里是说在艾伦在过去某个时段内在购物时,同时有个女孩报了警）
其它例句：
While I was searching…I found something…strange.
但是当我调查的时候,我发现…一些奇怪的事情.
其实when和while用法有两个明显区别,只要明确了,
1、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 you've 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?
② Strike 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.
2、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 When he had finished his homework,he took a short rest．（finished先发生,只能用when）当他完成作业后,他休息了一会儿.
② While we were dancing,a stranger came in．（dance为延续性动词,这里习惯上首选while,当然用when也不算错）当我们跳舞时,一位陌生人走了进来.
再问： While the alien was buying a souvenir , the girl called the police .这句话如果换成由when引导，是不是应该说成：When the girl called the police , the alien was buying a souvenir.我有点儿分不清当when引导两个动作一个较长的动作用过去进行时，一个较短的动作用一般过去时时，是应该较长的动作做主句，还是较短的动作做主句，还是没有要求；此时与while如何替换？
再答：如果是表达一个过去时态，一个过去进行时态，此时两件事情时间有重合，用when和while都行。至于谁来做主句，没有语法要求，强调哪个意思，哪个就可以做主句，呵呵。

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