辨析 when while as
(1)做当……时候讲时,既可以和瞬间动词连用,也可以和延续性动词连用,与主句所述动作既可以同时发生,也可以先后发生,且when还有这时,既然的意思.
(2)when当这时讲时,常用于固定句型be doing\be about to do(立即,马上)\be on the point to do…….when……意为某人刚要/正要做……这时……, 如:
I was walking along the street when suddenly someone patted me on the shoulder from behind.
我正在街上走,这时突然有人从后面拍打我的肩膀
(3)when当既然讲时,引导状语从句. 如:
Why do some rich people steal things when they could easily afford to buy them?
既然他们很容易买得起这些东西,为什么富人还要偷呢?
(1)做当……时候讲时,用于同时进行的两个延续性动词相伴随而发生。
(2)while还可译为然而,尽管的意思. while当然而讲,表示两个动作进行对比,如:
All of us are working hard while he is sleeping.
我们都在努力工作,然而他在睡觉。
(3)while当尽管讲,如:
While the numbers of such developments are relatively small, the potential market is large.
尽管目前发展是有限的,但潜在的市场很大。
引导时间状语从句时,强调两个持续性动作同时发生,一般译为随着;一边……一边……,如:
He hurried home, looking behind as he went.
他匆忙回家,一边走一边往后看。
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本回答部分摘自我的新书《初中英语自诊断》重难点500词辨析详解,欢迎关注微信公众号teacheray咨询。
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