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1. where指地点，在定语从句中做地点状语用来表示地点的定语从句。 (1) Shanghai is the city where I was born. (2) The house where I lived ten y ears ago has been pulled down. 2. when引导定语从句表示时间。在定语从句中做时间状语也可做连接词用 (1) I still remember the day when I first came to the school. (2) The time when we got together finally came. [注]表示时间time一词的定语从句只用when引导，有时不用任何关系代词，当然也不用that引导。 By the time you arrived in London, we had stayed there for two weeks. 到你到达伦敦的时候，我们在那里已经待了两个星期。 I still remember the first time I met her. 我仍然记得我第一次见到她。 Each time he goes to business trip, he brings a lot of living necessities, such as towels, soap, toothbrush etc。 每一次他去出差，他带来了生活必需品，如毛巾，肥皂，牙刷等，很多。 3. why指原因 在定语从句中做原因状语 (1) Please tell me the reason why you missed the plane. (2) I dont know the reason why he looks unhappy today. 注意：关系副词引导的从句可以由介词+关系代词引导的从句替换 | 
