时间状语从句两个知识点讲解

时间状语从句两个知识点讲解
 
引导时间状语从句的从属连词
引导时间状语从句的从属连词很多,如较基本的有before, after, when, while, as, since, till, until, as soon as 等:
Things were different when I was a child. 我小时候情况与现在不同。
We must strike while the iron is hot. 我们要趁热打铁。
It’s a long time since I met you last. 从上次见到你,已有很长时间了。
He waited until she was about to leave. 他等着一直到她准备离开。
除以上基本的引导时间状语从句的从属连词外,还有些本来不是从属连词却可用作从属连词的词:
(1) 表示的从属连词:the moment, the minute, the second, the instant, immediately, directly, instantly, once, no sooner…than, hardly…when等。如:
Immediately he came I told him the news. 他一来我就把消息告诉了他。
The moment I saw him I knew there was no hope. 我一看到他就知道没希望了。
We had no sooner set out than it began to rain. 我们刚出发就下雨了。
Once he arrives, we can start. 他一来我们就可以开始。
(2) 涉及time的几个从属连词:every time(每次)each time(每次)(the) next time(下次)any time(随时)the last time(上次)the first time(第一次)。如:
Every time I see her I’ll think of it. 每次我看到她,我就想起这事。
He felt nervous each time she spoke to him. 每次她和他讲话,他都感到紧张。
He didn’t tell me the last time I saw him. 我上次见到他时他没告诉我。

与时间状语从句有关的时态问题
关于这个问题有两点值得注意:
(1) 当主句为将来时态或具有将来意义时,时间状语从句通常要用一般现在时表示将来意义,而不能直接使用将来时态:
Turn off the lights before you leave. 走前关灯。
I will tell him as soon as he arrives. 他一来我就告诉他。
(2) since 从句搭配的主句的时态通常是现在完成时态:
He has lived here since 1999. 1999年以来,他就一直住在这儿。
Where have you been since I last saw you? 自我上次见到你之后你到哪里去了?
【注】在特定的语言环境中有时也可能用过去完成时或一般现在时:
It seems like years since we last met. 我们似乎几年未见面了。
Yesterday he told me that he hadn’t eaten anything since Tuesday. 他昨天告诉我自星期二以来他一直未吃任何东西。

Leave a Reply

电子邮件地址不会被公开。 必填项已用*标注