介词提前时，关系代词不可省，即介词＋which(指物时介词后的关系代词只能用which)。

　　The house which/that was destroyed in the earthquake is weak.

　　The pen (which/that) you found yesterday is mine.

　　The games (that/which) the young men competed in were difficult.

　　The games in which the young men competed were difficult.

　　※注:介词+关系代词即介词+whom/which(先行词指人用whom，指物用which)。

　　※5.as指人或物，在定语从句中可作主语，宾语，表语或状语，不能省略。主要用于 “the same …as…；such …as…；so …as…；as … as…；as follows”固定结构中，形式固定此时的引导限定性定语从句。要用as代替who(m), which, 或that引导定语从句：

　　Such people as knew Hill thought he was honest.

　　Such people as Hill knew thought he was honest.

　　My hometown is no longer the same as it was.

　　Here is so big a stone as no one can lift.

　　The child knows as much as grow-ups (know).

　　I’d like to have the same books as are used in your school.

　　He is not such a person as I expected.

　　He will marry as pretty a girl as he can find.

　　※注：which和as可引导非限定性定语从句：可以指代主句中的一部分或整个句子的内容，which和as都可以指代主句中的一部分或整个句子的内容，有时可以互换。因此，当as/which指代前面的整个句子，或前句中的部分内容作定语从句的主语时，谓语用单数．

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