易错点七：忽略as 和which 引导非限定性定语从句的区别 。例 13. He failed in the exam again， which was expected. 　　例 14. He failed in the exam again， as was not what he had expected. 析：例 13 中的 which 应改为 as ;例 14 中的 as 应改为 which . as 和 which 虽然都可引导非限制性定语从句，但仍有以下三点区别：( 1 ) as 有“正如;就像”之意，而 which 没有;( 2 ) as 引导的非限制性定语从句可置于句首、句中或句末，而 which 只能置于句末;( 3 )如果非限制性定语从句是否定句时，只能用 which 引导。

　　易错点八：忽略that 和which 引导限制性定语从句的区别。例 15. This is the most exciting football game which I have ever seen. 　　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 ”。

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