定语从句详解（五）

　　介词+关系词

　　1）介词后面的关系词不能省略。

　　2）that前不能有介词。

　　3）某些在从句中充当时间，地点或原因状语的介词+关系词结构可以同关系副词when 和where 互换。

　　This is the house in which I lived two years ago.

　　This is the house where I lived two years ago.

　　Do you remember the day on which you joined our club?

　　Do you remember the day when you joined our club?

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