第1个回答 推荐于2018-04-15
when while 并没有什么固定,句式啊,他们都依附于主句,引导时间状语从句,但when有几个固定句型,不能与while替换 be doing sth...when, be about to do sth...when, be on the point of doing sth...when
while 此外还有两个用法,一是作为一个转折连词,相当于but,意思是然而,但是:另外一个是引导让步状语从句,意思是尽管本回答被提问者采纳
第2个回答 2016-04-23
1.While引导时间状语从句时,做“当…时候…”讲时,只能与延续性动词连用。When可以和延续性动词或非延续性动词连用。
While he was reading,he fell asleep. When he came in,I was having lunch. When I was sleeping,a thief broke in.
2.从句动作和主句动作同时发生,且从句动作为延续性动词时,when,while,as都可使用。
①When/While/As we were dancing,a stranger came in.(dance为延续性动词)当我们跳舞时,一位陌生人走了进来。
②When/While/As she was making a phone call,I was writing a letter.(make为延续性动词)
3.由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时;如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,如: a. When the teacher came in, we were talking. 当此句改变主从句的位置时,则为: While we were talking, the teacher came in. b. They were singing while we were dancing.
延续性动词与非延续性动词
一.延续性动词表示能够延续的动作,如:learn, work, stand, lie, know, walk, keep, have, wait, watch, sing, read, sleep, live, stay等。
二.非延续性动词也称终止性动词、瞬间动词,表示不能延续的动作,这种动作发生后立即结束。 如:open, die, close, begin, finish, come, go, move, borrow, lend, buy等。
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