2017年中考英语真题及答案:2017年中考英语难点语法详解：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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