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,

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Whilethealien____asouvenir,thegirlcalledthepolice.A.wasbuyingBbought为什么选A,如果换成是用when引导,这句话等于什么,请详解,W

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,
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,

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.

因为while表示一段时间而不是时刻！while后面的动作常常是持续性的、正在进行的动作。when没有此功能，常跟着短暂的动作。

while 一般后面接延续性动词。

不是说While引导的从句谓语动词必须是延续性的吗？那怎么还可以用buy呢？ 这里指购买这一全过程。 去，讨价还价，付货，交款，是个过程，很久的。

while只能和延续性动词连用或表示一种对比
对于你对楼上的的追问 其实你的那种说法也对 这两种没有严格的界限 你只需要记住我的第一句话即可

有填空和句型转换,填空：Mike hurt his leg while he ____ ____ football.____ you see the teacher while you ____ ____ for the bus?句型转换：The woman was shopping when the alien got out.（用while改写）_____ the woman _____ _____ ,the While the alien was in the museum,I called the TV station.是个什么句子? While the alien was in the museum,I called the TV station .Isn't that amazing! 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, Mary was shopping when the alien entered the supermarket.(用while改写句子) mary was shopping when the alien entered the supermaket用while改写该句 同义句转换——英语八下While the alien was buying a souvenir,the girl called the police.While the alien was visiting the museum,the boy called the TV station.把句中的while改成when while girl was shopping when ,the alien got out.神马意思 _While_the girl was shopping the alien got out.里面的While能换成When吗?为什么? the alien was buying a cap,i called my friend 用when还是while While the alien was buying a souvenir, the girl called the police中buy是延续性动词吗 I,while,was,down,the,walking,street,alien,an,of,out,got,UFO,the(连词成句） ( ) the girl was shopping, the alien got out.选择： A.when B.while应该要用哪个? while the alien was buying a souvenir,the girl called the police.这个句子如果把while换成when可不可以?换了之后, 初二英语An alien got out ____- the UFO and walked ____ the street A of down B from along 英语翻译while the boy was walking down the down the street the UFO landedthe girl was shopping when the alien got outwhile the girl was shopping the alien got out 有关as soon as________ the alien was in the museum ,I called the TV station.While 我明白 可 as soon as 英语翻译The boy was walking down the street when the UFO landed.While the boy was walking down the street,the UFO landed.The girl was shopping when the alien got out.While the girl was shopping,the alien got out.