when同while有咩分別?

when係指ㄧ樣o野發生緊o既時候,另一樣o野發生。而while就是兩樣o野同時發生。

2007-03-01 21:00:39 補充：
sw33t_2g3th3r講o既o野有D錯:when同while都可以用係句子既頭同尾。

when係比較短時間既~
while就相反~

while可以解''一會兒'',''而'',''雖然'',''只要''等等......

而when可以係疑問字句''何時'',或許係陳述句既''當xxx時'',同轉按句既''既然''......

The followings are explanations and teaching aids from learn english and British Council~~
圖片參考：http://hk.yimg.com/i/icon/16/8.gif



Adverbs
When and While


Both when and while can be used to talk about actions or situations that take place at the same time.
1 Backgrounds
We can use both words to introduce a longer 'background' action or situation, which is/was going on when something else happens/happened.
Somebody broke into the house when they were playing cards. While they were playing cards, somebody broke into the house. Note that when and while clauses can go at the beginning or end of sentences.
2 Simultaneous long actions
We usually use while to say that two longer actions or situations go / went on at the same time.
While you were reading the paper, I was working. If we are talking about ages and periods of life, we use when:
When I was a child we lived in London (NOT While I was a child …) His parents died when he was twelve (NOT … while he was twelve) 3 Simultaneous short actions
We can use (just) when to say that two short actions or events happen / happened at the same time:
I thought of it (just) when you opened your mouth. While is not possible in this situation.
4 Reduced clauses
It is often possible to leave out subject + be after when and while:
While/When in Germany, he got to know a family of musicians. (=While/When he was in Germany …)http://www.learnenglish.org.uk/grammar/archive/whenwhile01.html
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What is the difference between when and while?
Both when and while can be used to talk about actions or situations that take place at the same time.
Swan identifies the following differences:
1 Backgrounds
We can use both words to introduce a longer 'background' action or situation, which is/was going on when something else happens/happened.

圖片參考：http://www.britishcouncil.org/spacer.gif
While they were playing cards, somebody broke into the house. Note that when and while clauses can go at the beginning or end of sentences.
2 Simultaneous long actions
We usually use while to say that two longer actions or situations go / went on at the same time.

圖片參考：http://www.britishcouncil.org/spacer.gif
While you were reading the paper, I was working. If we are talking about ages and periods of life, we use when:

圖片參考：http://www.britishcouncil.org/spacer.gif
His parents died when he was twelve (NOT … while he was twelve) 3 Simultaneous short actions
We can use (just) when to say that two short actions or events happen / happened at the same time:

圖片參考：http://www.britishcouncil.org/spacer.gif
I thought of it (just) when you opened your mouth. While is not possible in this situation.
4 Reduced clauses
It is often possible to leave out subject + be after when and while:

圖片參考：http://www.britishcouncil.org/spacer.gif
While/When in Germany, he got to know a family of musicians. (=While/When he was in Germany …)



http://www.britishcouncil.org/learnenglish-central-grammar-adverb-when-and-while.htm

兩者意思上.. 都冇太大分別..
不過.. while.. 一般係唔會用係句子既begining..
而when.. 就係可以既..