据报道自清华大学建立以来已有一百多年了。自从他戒烟已经三年了。it won’t be long before he is ready for his new job.约翰认为他不久就会为新工作做好准备了。表示“一……就……”含义的词(短语)引导的时间状语从句(1) as soon as;immediately;directly;instantly;the moment/minute/instant;no sooner...than...;hardly...when...(2)hardly...when...; no sooner...than...中主句用过去完成时从句应用一般过去时;当hardly和no sooner 位于句首时主句要部分倒装。The moment I heard the voice,I knew father was coming.我一听到那个声音就知道父亲来了。hardly got to the office when my wife phoned me to go back home at once.
我刚到办公室我妻子就打电话让我立刻回家。no sooner finished his speech than the students started cheering.
=No sooner had he finished his speech than the students started cheering.他刚结束演讲学生们就开始欢呼起来。4.引导时间状语从句的其他常见连词(1)until与till引导的时间状语从句意为“直到……时”引导时间状语从句时表示主句的动作发生在从句的动作之前。当主句的谓语动词是延续性动词时主句常用肯定形式;当主句的谓语动词是非延续性动词时主句常用否定形式(2)every/each time,next time,the first time,whenever等引导的时间状语从句。(3)by the time引导时间状语从句时从句用一般现在时主句用将来完成时;从句用一般过去时主句用过去完成时。Whenever we met with difficulties,they came to help us.每当我们遇到困难他们就来帮忙。By the time you come back,we will have finished the job. 当你回来的时候我们将已经完成这项工作了。
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