Where 和 when 可以用于限制和非限制性定语从句，why 只能用于限制性定语从句。它 们在从句中分别作时间、地点和原因状语，其结构相当于介词+关系代词。 I still remember the day when/on which we first met. The year 1968, when/in which the American astronauts first landed on the moon, was important in history. The city where/in which I was born is on the new railway line. The city of Pisa, where/in which Galileo made his famous experiment of falling object, is now a tourist city. This is the reason why/for which he left the company. 注意是否选用关系副词不能光看先行词是否是表示时间、 地点和原因的名词， 而必须分 析从句谓语动词与先行词之间的语法关系。 如果关系词在从句中作主语或宾语， 则仍须用关 系代词 which 或 that。 I like to take my vacation in the mountain, which is quiet and beautiful. where there are many plants. We will never forget the day which we spent together. when we worked. That is the reason which he gave us for his action. why he did that thing.
有一种定语从句，它既修饰先行词，同时又作为另一分句结构的宾语。这样，定语从 句嵌入另一结构中，称为嵌入式定语从句。 She is a top student, who they say has won five prizes in the maths contest. I have an idea which I’m sure will interest you. We will have a new science teacher, who I know has just returned from Britain. We were happy to see the singer who she said was well-know in western countries. There are some diseases which I think are caused by pollution. He read a poem which we thought was written by a poet in the Qin Dynasty. I was introduced to a writer whom they said many high school students admired.
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