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　　例 16. Here are the samples that — had I thought of it — you could have taken with you yesterday.

　　析：例 15 中的 which 应改为 that ；例 16 中的 that 应改为 which .当先行词被最高级、序数词修饰或先行词本身是不定代词时，只能用 what 来引导定语从句，如例 15 ；当关系词后面有插入成分时，只能用 which 来引导定语从句，如例 16 .

　　易错点九：介词前置出差错。

　　例 17. The two things with which Marx was not sure were the grammar and some of the idioms.

　　例 18. Tell him all the things to which he should pay attention. 　　析：例 17 中的 with 应改为 about 或 of ；例 18 中应把 to 移到 attention 的后面。在定语从句中前置的介词必须和后面的动词或形容词构成固定搭配，如例 17 ；但并不是所有的固定搭配中的介词都可前置，如例 18 .

　　易错点十：which 和whose 的意义不明确。

　　例 19. The book which cover is broken is of great help to all of us. 例 20. The book of whose cover is broken is of great help to all of us.

　　析：例 19 中的 which 应改为 whose ；例 20 中的 whose 应改为 which .在定语从句中，关系代词 which 不能在定语从句中作定语，但 whose 可作定语，“ whose + n ”相当于“ the + n + of which ”或“ of which + the + n ”。