2013职称英语时间状语从句精讲

　　前面我们已与大家分享了定语从句的概念、用法等，同时，状语从句也是职称英语历年考题中易考的语法点，所以希望广大考生能进行全面掌握。

　　新东方在线网络课堂职称英语辅导团队根据多年辅导经验，将状语从句的类别、用法、考点等归集如下，以帮忙职称英语考生对状语从句来重新熟悉并达到熟练运用，达到提高成绩的目的。

　　状语从句指句子用作状语时，起副词作用的句子。它可以修饰谓语、非谓语动词、定语、状语或整个句子。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。状语从句一般由连词(从属连词)引导，也可以由词组引起。从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。

　　时间状语从句考点聚焦

　　（1）as、when、while用法

　　as表示“当……的时候”，往往和when/ while通用，但它着重强调主句与从句的动作或事情同时或几乎同时发生。

　　She came up as I was cooking.(同时)

　　The runners started as the gun went off.(几乎同时)

　　when:(at or during the time that )既可以表示在某一点的时候，又可表示在某一段时间内，主句与从句的动作或事情可以同时发生也可以先后发生。

　　It was raining when we arrived.(指时间点)

　　When we were at school, we went to the library every day.(在一段时间内)

　　while意思是“当……的时候”或“在某一段时间里”。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，从句中的动词一般要用延续性动词。在when表示a period of time时，两者可以互换。

　　Please don’t talk so loud while others are working.

　　He fell asleep while/when reading. Strike while the iron is hot.(用as或when不可，这里的while意思是“趁……”)

　　（2）引导时间状语从句的连接词除上述外还有：

　　①till, not … until …, until, before, since

　　Don’t get off the bus until it has stopped.

　　He waited for his father until(till)it was twelve o’clock.

　　It will be five years before he returns from England.

　　②hardly / scarcely … when, no sooner … than, as soon as once

　　表示“一……就”

　　As soon as I have finished it , I’ll give yu a call.

　　Once you show any fear, he will attack you.

　　We had hardly got / Hardly had we got into the country when it

　　began to rain.

　　No sooner had he arrived / He had no sooner arrived than she started complaining.

　　③directly, immediately, the moment, the minute that… 一……就

　　He made for the door directly he heard the knock.

　　④each time, every time, by the time

　　Each time he came to my city, he would call on me.

　　注意：表示未来情况，主句用将来时，从句用现在时。