1.when, while, as的区别 这三个词都可以用作连接词,表示时间关系,但有所区别。
(1)when表示时间关系时,意思常常是“当(在)……的时候”。主句和从句中的动作或事情可以同时发生,也可以先后发生。例如:
When we were at school, we went to the library every day.
I’ll go when I have had my dinner. The film had begun when we arrived at the cinema. 注意:when有哪些通常所在的句型? (2)while 用作连接词表示时间关系时,意思也是“当(在)……的时候”,主句中的动作或事情在从句中的动作或事情的进展过程中发生。它有时可与when通用,但它只能指一段时间(a period of time),而不能指一点时间的(a point of time)。如上面第一个例句中的when,可以用while代替;而第二个例句中的when,就不能用while代替。例如:
Please don’t talk so aloud while others are working.
While I am washing the floor, you can be cleaning the windows. While也可表对比。 I like reading while he prefers listening to music. 谚语:Strike the iron while it is hot. (3)as用作连接词表示时间关系时,意思也是“当(在)……时候”,往往可与when或while通用,但它着重指主句和从句中的动作或事情相并发生。例如:
I saw him as he was getting off the bus. As he walked on, he felt himself getting more and more tired. As time passes by, we grow older and learn more. As industry develops,more and more farmland has been taken up. 2.一些表示时间的名词短语也可用来引导时间状语从句 the minute, the moment, the instant, every time, the last time, every time。如: The first time I got to the island, I was amazed by its beauty.
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