As/when/while
当时不同
[高手出招]
( 1 ) I was doing my homework ____________suddenly a stranger came in.
( 2 ) The students sang ___________they went out of the classroom.
( 3 ) ___________I was doing my lessons last night, she was watching TV.
[一语击破]
as 意思是当时候,往往强调主句和从句中的动作或事件同时发生,有时译成一边一边。如:
We talked as we walked.
when 是普通用语,在表示当时候时,从句的谓语动词既可用延续性动词,也可用短暂性动词,有时可以替代 as 或 while .如:
When we got to the cinema, the film had already begun.
while 引导的从句的动作常表示一段较长的时间或一个过程,常用进行时态,强调主句和从句的动作同时发生。如:
Someone was knocking at the door while we were having supper.
注意: while 从句中的动词一般是延续性动作的动词。
(误) While he came back, we started to work.
(正) When he came back, we started to work
Keys: ( 1 ) when ( 2 ) as ( 3 ) While
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