改：改what为that或将what删除。

　　析：先行词为指物的不定代词时，定语从句用that来引导，that在从句中作宾语时可省略，而what不能引导定语从句。

　　11. He is our English teacher,without his help I couldn"t have made such rapid progress.

　　改：将his改为whose。

　　析：犯这类错误的主要原因是没有弄清句子结构。这是一个主从复合句，逗号前面是主句，逗号后面是介词 关系代词引导的非限制性定语从句。

　　12. The scientist has made another discovery,that I believe is of great importance.

　　改：将that改为which。

　　析：that不能引导非限制性定语从句。

　　13.There"s somebody that wants you on the telephone.

　　改：that改为who或去掉that。

　　析：先行词是-body，-one构成的复合代词时，关系代词用who （whom）不用that。口语中在It be/there be/here be后面的关系代词可省略。

　　14. John, who greeted me is my teacher, that is deeply respected by all.

　　改：me之后加逗号；that改为who。

　　析：第一个who引导的是非限制性定语从句。从句位于句中时，两头须用逗号与主句隔开。第二个who引导的也是一个非限制性定语从句，关系代词在指人时须用who（whom），在指物时须用which，不能用that。

　　15. Do you know the reason why do many people like Zhang Yimou"s films？

　　改：去掉why之后的do。

　　析：定语从句须用陈述句语序。关系副词why在从句中作原因状语，其先行词是表示原因的reason。

　　16. Which is known to all， Mount Emei is one of the famous mountains of China.

　　改：Which改为As。

　　析：which， as都可作关系代词引导非限制性定语从句，表示整个主句的内容，并在从句中作主语、宾语。这种从句放在主句的后边时，which， as均可引导；放在主句的前边时，一般用as引导。

　　17. Who are the persons who are sitting on the travel bags and which is the bag which belongs to me？

　　改：将句中第二who和第二个which 都改为that。

　　析：当主句是以who或which开头的特殊疑问句时，为了避免重复，定语从句要用that引导而不用who （whom）和which引导。

　　18. The woman who you spoke is an actress.

　　改：在spoke之后加to。

　　析：关系代词who在定语从句中作介词的宾语时，介词须后置。如果介词to前置，who得变为whom。

　　19. The number of people lost homes reached as many as 250,000 in the earthquake and the fires in San Francisco in 1906.

　　改：在people之后加关系代词who/that。

　　析：关系代词在定语从句中作主语时不能省略。

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