2017届高考英语语法专题复习教案：必备句型全归纳_高考复习指南

　　It will ( not ) be + 时间段 + before …要过多久 ( 不久)…..才…..

　　Eg. It was not long before he sensed the danger of the position.

　　It was three years before he came back.

　　It will be half a year before you graduate from this school.

　　4. no sooner …than…= hardly…when…一…就…., 刚刚…就…

　　No sooner / hardly + 过去完成时,than / when + 一般过去时

　　如果no sooner, hardly 位于句首, 主句要倒装.

　　He had hardly sat down to have a rest when the door bell rang and in came Allan.

　　No sooner had he got off the train than his daughter ran towards him.

　　Hardly had we arrived when she started crying to go home.

　　5. once 一旦…., 表示时间和条件

　　Once you understand this rule, you will have no further difficulty.

　　Once you have decided to do something, you should do it well.

　　Once you enter the chemistry lab, you should follow the teacher’s instructions.

　　6. since … 自从….以来

　　Since 引导的从句不论是延续性或非延续性动词, 都表示的是动作或状态的完成或结束.

　　注意一下句子翻译:

　　Since he lived in Nanjing, I have not heard from him. (= since he left Nanjing…)

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