高考英语时间和条件状语从句讲解

高考英语时间和条件状语从句讲解 一、本节内容 时间状语从句 引导时间状语从句的连词有:(---的时候) when, while, as, (刚---就---)no sooner ---than, hardly---when, (一---就---)as soon as, the moment (that), the minute (that), immediately, directly, instantly, (直到) till, until, since, before, after, once , whenever等. 1、while, as, when/whenever的用法比较 （1）while 常表示一段较长的时间或一个过程，强调主句的动词和从句的动词所表示的动作或状态是同时发生的。它不能表示一时性或短暂的动作。 Don't talk so loud while others are working.别人工作时，请勿大声说话。 While he was eating, I asked him to lend me $2.当他正在吃饭时,我请他借给我二英镑。 We should strike while the iron is hot.我们要趁热打铁。 【while的用法】 (1)引导时间状语从句,从句中的谓语动词应用延续性动词或表示状态的词。 (2)引导让步状语从句,多用于句首。意为“尽管,虽然”。 eg.While I admit his good points I can see his bad. While he loves his students, he is very strict with them. (3)While作并列连词用,意思为“而,然而”,表前后意义上的对比或转折。 eg.There's plenty of rain in the southeast, while there's little in the northeast. Some people waste food while others haven't enough. ★注意:while与but的区别 二者都有“而,然而”之意,但while强调二者的对比,而but强调前后的转折关系。 （2）when 引导的时间状语从句，可指时间的一点，也可以指一