但三者也有区别: 1)when既可表时间点也可表时间段,即从句中的谓语动词可以是瞬间动词(不能与while互换),也可以是延续性动词(一般可以与while互换)。如: When I arrived at the airport, I found the plane had taken off. (瞬间)
When you watch TV, you should keep a certain distance to protect your eyes.(延续)
2)while只能表时间段,即从句中的谓语动词只能是延续性动词,表示动作或状态的持续,而且经常是用进行时。 如: We must keep silent while others are studying.
特殊句型: A. While I admit the paper is very difficult, I don’t think you should give it up.
(虽然我承认这份试卷很难,但我认为你不应该放弃。while 表示让步的逻辑。)
B. He likes pop music, while I am fond of classical music.(while是并列连词,引导的是并列句,表对比)
3)as强调伴随,即从句动作是伴随着主句动作同时发生的一个次要动作,“一边…一边…”。如: The class took notes of what the professor taught as they listened to him attentively.
二、地点状语从句 引导地点状语从句的从属连词有 where, wherever 等。
难点1:where, wherever指具体地点时,从句可于主句前或后;表抽象条件的含义时,从句须在主句前。We should go where the Party needs us most.
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