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一.when, while, as 都有“当…的时候”的意思, 具体用法如下:
When/As:
e.g: He was sleeping when/as the film started.
e.g: My father came into my room when/as I was watching TV.
总结:1.主句(过去进行时)+ when/as + 从句(过去时) 动词:主长从短
2. 主句(过去时)+ when/as + 从句(过去进行时) 动词:主短从长
While:
e.g: He was sleeping while his father was reading.
e.g: My father came into my room while I was watching TV.
总结:1.主句(过去进行时)+ while + 从句(过去进行时) 动词:主长从长
2. 主句(过去时)+ while + 从句(过去进行时) 动词:主短从长
指某一段时间发生的事情,while, when, as均可用
指某一时间点发生的事情,只能用when, as
while和as 引导的时间状语从句,主从句谓语动作同时发生
总结:主长从长用while,主长从短用when/as,主短从长三者皆可,
二.When, while, as 表达其他意思的情况。
e.g When will you finish your homework? 何时…
e.g My brother likes watching TV while I like doing sports. 然而…
e.g As the temperature drops, winter will come soon. 随着…
e.g I choose the subjects the same as you. 正如…
e.g The boy walked as he sang. 一边…一边…
e.g As a student, we should study carefully. 作为…
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