as,while,When
as强调两个动作同时进行,动作通常是延续性的,且表示“一边……一边”;还可表示“随着时叵的推移”。例:
He always sings as he walks.
As time went on,his theory proved to be correct.
when引导的时间状语从句中,其谓语动词可以是延续性的,也可以是非延续性的,有时还表示“就在那时”。例:
When the teacher came in, the students were reading aloud.
When he stayed in America, he learned a lot of English.
We were about to set out when it began to rain.
while在……期间,引导的从句的动作是延续性的,并侧重主从句的动作同时发生;有时while还表示转折关系“而”。例:
While his mother was cooking in the kitchen, the little boy fell asleep in the chair.
He is a worker,while his sister is a doctor.
原因状语从句的引导词有:as because,since,now that 等。
如:Now that you are all here,let’s reach a decision.
注意,for是并列连词,引导的是并列句,对前述内容作补充性说明。
【锦囊妙计,战胜自我】
时间状语从句的引导词有:when,while,as, every time,the moment,hardly...when,no sooner...than等。
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