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选修8《Learning about Language》精品PPT课件优质课下载
1.时间状从
2.地点状从
3.原因状从
4.条件状从
5.目的状从
6.结果状从
7.方式状从
8.让步状从
9.比较状从
一 时间状语从句
１ when / whenever
When I came into the room, he was writing a letter.当我进屋时，他正在写信。
We shall go there whenever we are free.我们什么时间有空，我们就去那里。
2 when / while/ as
When 既可指某一点时间,也可指一段时间;
while指“在某一段时间里”，“在…期间”，引导的动作必须是持续性的;
as强调主句和从句的动作同时发生。,翻译成”一边……一边……”
When he returned, his wife was cooking.
While he was reading, his wife was
cooking.
As he was reading, he was listening to the
radio.
As time goes by,he grews older.
注意:
when / while都可以做并列连词,连接并列