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1、case, situation, condition, stage, point, position 等作先行词引导的定语从句,Hes got himself into a dangerous situation _ he is likely to lose control over the plane. A. where B. which C. while D. why,A,分析：定语从句引导词where在句子中作状语，表示“在此情况下”，还可以用in which替代。句子意思是：他使自己身临险境，（在这种情况下）他很可能失去对飞机的控制。situation在句中是“情境、情况”的意思，译为
2、：in this situation。此处where=in which,当situation（情境、情况），condition(s)（条件、状况），case（情形、案例），stage（阶段），point（点、程度），position（位置），places（地方）等作先行词时，后面的定语从句引导词有如下两种情况：,1. 作主语或宾语； 2. 作状语,(1).引导词在从句中作主语或宾语时，引导词用which/that，作宾语时，引导词可以省略。,Worrying never helps in a situation (that/which) you cant change. 对于你无法改变的的状况
3、，发愁于事无补。（引导词在句子中作宾语）,(2)引导词在从句中作状语时，引导词可用where或介词+which,e.g. I can think of many cases _ students obviously knew a lot of English words and expressions but couldnt write a good essay. A. why B. which C. as D. where,D,分析：我能想起很多这样的情形：（在这些情形中）学生们显然认识很多英语单词和短语，却写不出一篇优美的短文。此题中定语从句引导词在句中作状语。,1. They devel
4、oped their friendship to a stage _ they often shared sorrow and happiness. 他们的友谊已经发展到同甘共苦的地步。 2. The police are looking into a case _ the suspect is a cat. 警察正在调查一个案子，案中的嫌疑犯是一只猫.,where/ at which,where/ in which,1. In an hour, we can travel to places _ would have taken our ancestors days to reach. (2
5、006上海) A. where B. when C. which D. what,当堂练习,C,2.-Do you have anything to say for yourself? (2006江西) -Yes, there is one point _ we must insist on. A. why B. where C. how D. / 3. He has to face the condition _ the pressure was heavy. A. which B. where C. how D. why,D,B,常见的介词搭配,at this stage, at this point, in this situation, in position, in/undercondition(s), in this case,