定语从句中,when.where与that,which的用法具体分析,能不能用例子说明?

1.当先行词是指物得名词时或者代词时,用应该用when.where 或者that,which.如何选择正确的引导词,要看后面的定语从句缺少什么句子成分,如果先行词是表示时间的名词,用when,如果先行词是表示地点的名词用where.这两个词在引导定语从句的同时,在定语从句中做状语.
例如：I will never forget the day when we worked together
Beijing is the place where she has been before.
2.that 和 which的 最大区别是,
1）that 既可以指代人,也可以是物,但是不能引导非限定性定语从句.which引导非限定性定语从句,which代表前面整个句子内容
2）that 引导定语从句时,前面不可以有介词
例如：He failed again in the exam,which made him very unhappy.
This is the house in which his grandmother once lived.
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