知识要点 要点四
语法 1.时间状语从句 (1)时间状语从句在句中起状语作用,表示时间。时间状语从句由after,as,before,since,till,until, when,whenever,while,as soon as等引导。 例句:Let’s wait till the rain stops. 咱们等到雨停了吧。 They were scolded whenever they were late for school.每次他们上学迟到都挨骂。 知识要点 (2)有一些表示时间的名词短语也可用来引导时间状语从句,如the minute,the moment,every time,the first time,the instant,the day,the week,the year,any time,next time,each time,the last time,all the time,from the time,by the time等。 例句:The moment he reached the country,he started his search. 他一到达这个国家,就开始他的探寻工作。 I recognized you the minute I saw you. 我一见到你就认出了你。 By the time he was 14,he had built his own lab. 到他14岁的时候,他已建立了自己的实验室。 知识要点 (3)有一些表示时间的副词也可用来引导时间状语从句,如directly,immediately,instantly等。 例句:The young lady rushed into the room immediately she heard the noise. 那位年轻女士一听到响声就冲进房间。 Directly the master came in,everyone was quiet. 校长一进来,大家就安静下来。 知识要点 【链接训练】 ①—Do you smoke? —No,I don’t.But I used to.It’s two years since I ________. A.smoked B.didn’t smoke C.have smoked D.began to smoke 【解析】since引导的时间状语从句中谓语动词常用一般过去时;在此结构中,延续性动词smoke表示这一动作的终结。后半句句意为:我已经有两年不吸烟了。 【答案】A 知识要点 ②On a rainy day I was driving north through Vermont _________ I noticed a young man holding up a sign reading“Boston”. A.which B.where C.when D.that 【解析】when用作连词,引出一个忽然出现的动作,意为“正在这时,(突然)”。 【答案】C 知识要点 ③I was so familiar with him that I recognized his voice ________ I picked up the phone. A.while B.after C.in case D.the minute 【解析】the minute+从句,意为“一……就……”,等于as soon as,引导时间状语从句。 【答案】D 知识要点 ④He was told that it would be at least three more months
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