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专题7　定语从句 考点1　as引导定语从句 真题解密 ________ is often the case with children，Amy was better by the time the doctor arrived.(2013·陕西，16) A．It B．That C．What D．As 变式训练 (1)There is no simple answer，________is often the case in science.(2013·山东，31) A．as B．that C．when D．where (2)A computer is so useful a machine ________ we can use everywhere. A．that B．which C．as D．what 知识生成 1．as通常引导非限制性定语从句，先行词为整个主句。 2．as引导非限制性定语从句时，主句中往往有such，the same，as，so等词。 3．注意：such/so...that...(that引导结果状语从句)和such/so...as...(as引导定语从句)的区别。 He is such a good boy that we all like him. 他是那么好的一个男孩，我们都喜欢他。 He is such a good boy as we all like. 他那么好我们都喜欢。考点2　where引导定语从句 真题解密 Sales director is a position ________ communication ability is just as important as sales skills. (2012·重庆，29) A．which B．that C．when D．where 变式训练 It’s helpful to put children in a situation ________ they can see themselves differently. A．that B．when C．which D．where 知识生成 当先行词为position，case，point，stage，situation，condition等，且定语从句中不缺少主要成分时，常用where引导定语从句，此时where相当于under which，from which，意为“在这种情况下，从……中”。一些不是明显表示地点的名词作先行词时，也常用where引导定语从句。如： He wrote a letter where he explained what had happened in the accident.(2013·江西，33) 他写了一封信，在信中，他解释了这起故事发生的事情。 Nowadays people are more concerned about the environment where they live.(2013·四川，9) 现在人们更加关注他们生活的环境。 Those successful deaf dancers think that dancing is an activity where sight matters more than hearing. 那些成功的盲人舞蹈家认为舞蹈是一项视觉比听觉更为重要的活动。考点3　“介词＋when或where”引导定语从句 真题解密 The book was written in 1946，________ the education system has witnessed great changes.(2007·山东，35) A．when B．during which C．since then D．since when 变式训练 I climbed up to the top of the tower with my friend，________ we enjoyed a splendid view of the city. A．where B．which C．from where D．in which 知识生成 关系副词when，where前可加介词since，from等引导定语从句。 Two years ago I bought a packet of your razor blades，since when I have used no others.两年前我买了一包你们的剃须刀片，从那以后我再没用过别的。 China is the birth place of kites，from where kite flying spread to Ja