学习必备欢迎下载1.时间状语从句的连词表示时间的连词有when, while, as, by the time, before, after, since, till/until, as soon as,有些名词短语也可以引导时间状语从句,如the moment, the instant, each time,有些是固定句型如: no sooner ⋯ than hardly/scarcely ⋯when。在这些连词的使用中应注意① as强调同时,也表示一边 ⋯⋯,一边⋯⋯" ,while 表示主句动作发生在从句的过程之中,要求从句谓语动词为状态动词或持续性动词,when 的使用则比较简单,相当于汉语的 "当⋯⋯时候"。如:Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes to classroom tests. A. when B. since C. before D. after ? 四个选项都表示时间,但根据主从句间的关系可以判断答案为 A。② 注意 when 的特殊句型下列句型中 when 连接的不是时间状语从句, 但考试中却常与其它时间状语从句的连词一块出题。were/was doing something when ⋯were/was about to do something when ⋯had just done something when ⋯? ③ 注意 no sooner ⋯ than ⋯.和 hardly/scarcely ⋯when句中的时态。④ 注意 not ⋯ until 中时间状语可以提前。如 ____ quite recently, most mothers in Britain did not take paid work outside the 学习必备欢迎下载home. A. Before B. Until C. From D.Since 比较常见的提前方式是将not until⋯.提至句首,后面用肯定形式,主谓倒装。本题可以改成, Not until quite recently did most mothers in Britain take paid work outside the home.这时,句子采用主谓倒装结构,应注意。⑤名词短语做连词引导时间状语从句时,如:the moment,the instant,the second,the minute都可做连词用,引导定语从句,意思是as soon as You see the lightening ___ it happens, but you hear the thunder later. A. the instant B. for an instant C. on the instant D. in an instant 能够引导时间状语从句的是名词the instant,而不是由其构成的介词短语。⑥ 注意含有时间状语从句的固定句型,如 It won't be long before ⋯ 和 It is ⋯since两类句型。 It won't be long before ...