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1、专题九 状语从句1.when 引导时间状语从句，意为“正在这时”，常用于以下句式：be about to dowhen 正要做这时be on the point of doingwhen正要做这时be doing when正在做这时had just donewhen 刚做完这时We were about to set off when it suddenly began to rain.我们刚要出发，突然下起雨来。注意：when 可表原因，意为“既然”。How can you expect to learn anything when you never listen.？既然你什么也听不下去，
2、你怎么能指望学到东西呢？2.as soon as, immediately, directly, instantly, the moment, the minute, the instant, no soonerthan, hardly/scarcelywhen 和once(一就)这些从属连词引导的从句都表示从句的动作一发生，主句的动作随即就发生，常译为“一就”。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。3.on doing sth/ on ones +n. 也可表示“一就”，引导时间状语从
3、句。On arriving at the station, the thief was caught.贼一到车站就被抓了。4.before（1）若表示“还未就；不到就；才；趁；还没来得及就”时，需用连词before。Please write it down before you forget it.趁你现在没忘把它记下来。（2）It will be +一段时间+before(从句用一般现在时) 多久之后才 It wont be long before (从句用一般现在时) 不久就 It was +一段时间+before(从句用一般过去时)It will be half a year befor
4、e I come back.还得待半年我才能回来。It wont be long before we meet again.没多久我们就会见面的。比较：Its/has been +时间段+since从句（从句用一般过去时）“某事发生有多久了”As is reported, it is 100 years since Qinghua University was founded.正如所报道的，清华大学建立有100年了。考点二： 条件状语从句1.通常由if, unless, as(so) long as, in case (that) 等连词引导。My parents dont mind what
5、 job I do as long as I am happy.我父母不在乎我从事什么样的工作，只要我高兴就好。2.由on condition (that); provided(that);providing(that); supposing(that)等引导的条件状语从句。You go swimming on condition that you dont go too far from the river bank.你只能在离河岸不太远的地方游泳。考点三： 地点状语从句1.通常由连词where和wherever引导，从句位于主句之前，也可位于主句之后。 The little girl wh
6、o got lost decided to remain where she was and wait for her mother.那个迷路的小女孩决定待在原地等她母亲。2.地点状语从句在句首时常兼有抽象条件意味。Where there is a will, there is a way. 有志者事竟成。考点四： 让步状语从句1.由although, though, as引导状语从句，although和though同义，用法基本相同。前者较正式，多置于句首；后者较通俗、口语化。注意：as 引导的让步状语从句多用于书面语，语序要倒装。Difficult as the task was, the
7、y managed to finish it in time.虽然这项任务很难，他们还是设法即时完成了。2.even if /even though 表示“即使，纵然”，有退一步设想的意味，多用于书面语中。Ill do it, even if it takes me all the afternoon.我要做这件事，即使它将花去我整个下午的时间。3.whether(or) 引导让步状语从句，提供两个或两个以上假设。Whether I go alone or he goes with me, the result will be the same.我自己走还是他跟我一起走，结果都是相同的。4.由“wh-+ever”或“no matter+ wh-“引导让步状语从句。Keep calm, whatever happens=Keep calm, no matter what happens.不管发生什么都要保持冷静。5.However/No matter how的语序“However/No matter how+ adj./adv.+主语谓语。However/No matter how late I came back, mother was always waiting for me.无论我多晚回家，妈妈总是在等我。