The boy was walking down the street when a UFO landed on Center Street.这里为什么用when不能用while还有2道题：1.You could write him a letter.Sorry,I don t like writing letters.这里能把writing换成to write吗?为什么?2.While she __

The boy was walking down the street when a UFO landed on Center Street.这里为什么用when不能用while还有2道题：1.You could write him a letter.Sorry,I don t like writing letters.这里能把writing换成to write吗?为什么?2.While she __
The boy was walking down the street when a UFO landed on Center Street.这里为什么用when不能用while
还有2道题：1.You could write him a letter.Sorry,I don t like writing letters.这里能把writing换成to write吗?为什么?
2.While she ______(正在通电话),Davy met another dog outside the station.这里填什么? 道理讲清楚者给分

The boy was walking down the street when a UFO landed on Center Street.这里为什么用when不能用while还有2道题：1.You could write him a letter.Sorry,I don t like writing letters.这里能把writing换成to write吗?为什么?2.While she __
The boy was walking down the street when a UFO landed on Center Street.
这里为什么用when不能用while
因为while后面要跟doing sth,正在进行
1You could write him a letter.Sorry,I don t like writing letters.不能换成to write因为这里要表达的是不喜欢写信这个动作,don't like to write a letter,是不想写的意思.
2.was at the phone.或者 was talking on the phone,习惯用法,没什么可以解释的

1.while要接延续性动词，land不是延续性动词，所以不能用while.
2.while she was ringing...

If you want to use while, the sentence must be like this : While the boy was walking down the street, a UFO landed on Center street.
1.Yes, u can if u change the sentence into another type. (Sorry, I don't like to write letters.)
2.While she was telephoning, Davy met another dog outside the station.

1、while强调的一个动作或者很短过程的“时候”，when则是一个相对长的时间过程，一个不明飞行物着陆的过程你也听说过，不是“咚”的一下就着陆的；
2、writing a letter表示写信这么一件事，不是单指这一封信或者那一封信，动名词表示的有这种普遍意义，to write仅仅表示去写这封信本身，意义完全不一样。
3、填was calling，和你的例句是类似的，强调她正在电...

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1、while强调的一个动作或者很短过程的“时候”，when则是一个相对长的时间过程，一个不明飞行物着陆的过程你也听说过，不是“咚”的一下就着陆的；
2、writing a letter表示写信这么一件事，不是单指这一封信或者那一封信，动名词表示的有这种普遍意义，to write仅仅表示去写这封信本身，意义完全不一样。
3、填was calling，和你的例句是类似的，强调她正在电话上叽叽喳喳说话这一事件。

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因为所以。科学道理。你不知道。你妈等你。