1,when表示“当……的时候。从句中既可用延续性动词,又可用非延续性动词,这些动词既可以表示动作,又可表示状态。从句中的动作既可和主句的动作同时发生,又可在主句的动作之前或之后发生。如:
When I came into the room, I found him lying there asleep.
Mary was having dinner when I saw her.
When you meet a word you don''t know, consult the dictionary.
She was beautiful when she was a girl.
如果when从句的主语与主句主语相同,谓语又是be动词,从句主语和be可以省略:当when从句主语与主句主语相同时,用when加分词可以替代状语从句。如:
When(you are)in trouble, ask her for help.
When(I was)sleeping, I never heard a thing.
2,as
(1)表示"当……时"、"和……同时"。常指从句的动作未结束,主句中的动作就已发生。从句中多用表示动作的动词,而不用be动词或表示感觉、理解、知道这类动词。
As he stood there, he saw two men enter the bar.
She dropped the glass as she stood up.
As I was walking down the street, an American asked me for directions to the nearest station.
(2)用于平行的动作中,表示"一面……一面……"。常指一个主语同时进行两个动作。如:
He sang as he worked.
The students took notes as they listened.
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