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1、（讲练测）2017年高考英语一轮复习语法专题状语从句复习（讲）新人教版必修3状语从句一、考点梳理。1.考查in case引导的状语从句 根据语境的不同，in case既可表示“如果”、“万一”，引导条件状语从句：也可表示“以防（万一）”，引导目的状语从句。 【例】 Leave your key with a neighbor_you lock yourself out one day. A. ever since B.even if C.soon after D. in case 【例】My parents live in a small village. They always keep c
2、andles in the house_there is a power cut. A. if B.unless C.in case D. so that 答案为C。in case在此引导目的状语从句，意为“以防”。2.考查before引导的状语从句 尤其要注意“It+be+-段时间+before.”这一句型。 【例】 The field research will take Joan and Paul about five months; it will be a long time_we meet them again. A. after B.before C.since D.when 答
3、案为B。it will be a long time before.的意思是“要过很久才会”。 【例】He was told that it would be at least three more months_he could recover and return to work. A. when B.before C.since D. that 答案为B it was some time before.的意思是“在之前过了一段时间”，通常可转译为“过了一段时间才”。又如：It was a long time before I got to sleep again过了好久我才又睡着。3.考
4、查while引导的状语从句 尤其要注意while表示“尽管”、“虽然”时的用法（此时它引导的不是时间状语从句，而是让步状语从句一一此用法许多同学并不熟悉，值得特别注意）。 【例】_I really dont like art,I find his work impressive. A. As B.Since C.If D.While 答案为Do while在此表示“尽管”、“虽然”，又如：While the question was difficult to answer,it was interesting尽管问题很难回答，但很有趣。 另外，while表示对比的用法也值得注意（此时它表示“而
5、”）。例如：【例】The cost of living in Glasgow is among the lowest in Britain,_the quality of life is probably one of the highest. A. since B.when C.as D.while4.考查when引导的状语从句 对于when的用法，同学们最熟悉的是表示“当的时候”。 【例】 -Wheres that report? -I gave it to you_you came in. A. if B.when C.because D. before 答案为B。将四个选项逐一填入空格
6、处，只有填when时，意思最通顺。句意为：当你进来时我就给你了。 需要注意的是，when还有个用法，就是表示“既然”，也是一个值得注意的考点。例如：【例】 Why do you want a new pen_youve got such a good one already? A. that B.where C.which D. when 答案为D。when在此表示“既然”。 还有一点也需注意，就是when表示“这时（突然）”的用法。例如：【例】I had just stepped out of the bathroom and was busily drying myself with a
7、towel_I heard the steps A. while B.when C.since D. after【例】 He was about halfway through his meal_a familiar voice came to his ears. A. why B.where C.when D.while 以上两题答案均选when，其意均表示“这时”。5.考查unless引导的状语从句 unless的意思是“如果不”、“除非”，对于涉及unless的考题，一般只要能读懂句意，弄清语境，就不会有问题。 【例】 Most birds find it safe to sleep i
8、n the trees, but_they have eggs or young chicks, they dont use a nest. A. why B.how C.unless D.where【例】I wont call you,_something unexpected happens. A. unless B.whether C.because D.while 以上两题答案为均选unless，其意均表示“除非”。6.考查until引导的状语从句 until的意思是“直到时”、“在之前”，对于涉及until的考题，一般只要能读懂句意，弄清语境，就不会有问题。 【例】 It is di
9、fficult for us to learn a lesson in life_weve actually had that lesson. A. until B.after C.since D.when 答案为A。将四个选项逐一填入空格处，只有填until时，意思最通顺。 另外，还要注意not.until.这一句式（直到才）。例如： 【例】You cant have this football back_you promise not to kick it at my cat again, the old man said firmly. A. because B.since C.when
10、 D.until 答案为D。until与前面的not相呼应，表示“直到才”。7.考查once引导的状语从句 once的意思是“一旦”，对于涉及once的考题，一般只要能读懂句意，弄清语境，就不会有问题。 【例】You will be successful in the interview_you have confidence. A. before B.once C.until D.though【例】environmental damage is done, it takes many years for the ecosystem（生态系统）to recover.(2006江苏卷) A. E
11、ven if B.If only C.While D.Once 两道题均选once，均表示“一旦”。8.考查where引导的状语从句 where可以用于引导地点状语从句，其意为“在的地方”，此用法许多同学都不熟悉，但高考经常考查，应引起特别注意。 -Mom, what did your doctor say? -He advised me to live_there are many trees. A. in where B.in which C.the place where D. where答案为D。where引导地点状语从句，表示“在的地方”。9.考查-ever引导的状语从句 whate
12、ver, whoever, however, whenever, wherever等引导状语从句时，其意相当于no matter what (who, how, when, where)等。 【例】In peace, too, the Red Cross is expected to send help_there is human suffering. A. whoever B.however C.whatever D. wherever 答案为D。 wherever意为“无论什么地方”，意义上相当于no matter where。又如：Being recognized wherever y
13、ou go is the price you pay for being famous.出名所付出的代价是不管你走到哪里，都会被人认出来。二、要点点拨。 一、时间状语从句1whenwhile与as-必记考点如果主句表示的是短暂性动作，而从句用延续性动词的进行时态表示在一段时间内正在进行的动作时，when，while与as可互换使用。 When/While/As l was walking down the street,I came across an old friend of mine. 当我沿着街走的时候，遇见了一个老朋友。while可作并列连词，表示对比，意为“而，却”。 He is
14、a worker while I am a doctor他是工人而我是医生。when可连接并列句，意为“就在那时”(=and then或and at that time)，常用于以下句式： sbwas doing sthwhen. sbwas about to do sthwhen. sbwas on the point of doing sth. when. sbwas just going to do sth. when. The baby was on the point of crying when her mother came home那婴儿刚要哭，这时她母亲回家了。 I was just going to explain when the bell rang. 我正要解释，突然钟声响了。【例】She had just finished her homework her mother asked her to practice playing
