1. She used to help my brother, who was very kind of her.
【改】將who改為which。
【析】犯這類錯誤的主要原因是把my
brother錯當成了先行詞。關系代詞which指代的先行詞是整個主句，它引導非限定性定語從句。
2. Do you still remember the day when we spent together in China last year?
【改】將when改為that / which或將
when刪除。
【析】犯這類錯誤的主要原因是沒有弄清關系代詞與關系副詞的用法區別。不能因為先行詞表示時間就一定用關系副詞when, 而要學會準確把握句子的結構，正確分析句子的成分。例句中定語從句要用關系代詞引導，并在定語從句中作spent的賓語。
3. The way which you look at problems is wrong.
【改】在which前加in或者將which改為that，也可將which刪除。
【析】當先行詞是the way時，定語從句常用that / in which引導，that / in which也可省略。
4. We were interested in the things and people whom we saw during the trip.
【改】將whom改為that。
【析】當先行詞既有人又有物時，定語從句用關系代詞that引導，that作賓語時可省略。
5. It was in the kitchen where the fire broke out.
【改】將where改為that。
【析】犯這類錯誤的主要原因是把強調
句型與定語從句混為一談了。例句為強調句型，強調的是地點狀語in the kitchen。
6. Is this factory that you have been working in since your graduation?
【改】在that前加the one。
【析】犯這類錯誤的原因是把this factory錯看作是定語從句的先行詞了。解答這類題時，我們不妨先將疑問語序改為陳述語序。this factory是主句的主語，故應添加the one作定語從句的先行詞。當然，在factory前加the也可以，那么this是主語，the factory是表語。
7. He is such a lazy man as no one wants to work with him.
【改】將him刪除或將as改為that。
【析】犯這類錯誤的主要原因是把such ... as ...和such ... that ...兩個句型混淆了。
8. There are many books in the library, most of which is in Chinese.
【改】將is改為are。
【析】關系代詞作主語時，定語從句中謂語動詞要與先行詞在人稱和數上保持一致。例句中關系代詞which指代的是先行詞books，故從句謂語動詞應用復數形式。
9. I am terribly sorry for having broken the MP4 I borrowed it from you the other day.
【改】去掉it。
【析】定語從句中的關系代詞在從句中充當一定的成分，因此從句中不能再出現與關系代詞指代相同的代詞或名詞，以避免重復。例句中it與省略了的關系代詞that/which重復，應去掉。
10. We will do all what we can to help you out.
【改】改what為that或將what刪除。
【析】先行詞為指物的不定代詞時，定語從句用that來引導，that在從句中作賓語時可省略，而what不能引導定語從句。
11. He is our English teacher, without his help I couldn’t have made such rapid progress.
【改】將his改為whose。
【析】犯這類錯誤的主要原因是沒有弄清句子結構。這是一個主從復合句，逗號前面是主句，逗號后面是“介詞 + 關系代詞”引導的非限制性定語從句。
12. The scientist has made another discovery, that I believe is of great importance.
【改】將that改為which。
【析】that不能引導非限制性定語從句。
13. There’s somebody that wants you on the telephone.
【改】that改為who或去掉that。
【析】先行詞是-body，-one構成的復合代詞時，關系代詞用who (whom)不用that?？谡Z中在It be / there be / here be后面的關系代詞可省略。
14. John, who greeted me is my teacher, that is deeply respected by all.
【改】me之后加逗號;that改為who。
【析】第一個who引導的是非限制性定語從句。從句位于句中時，兩頭須用逗號與主句隔開。第二個who引導的也是一個非限制性定語從句，關系代詞在指人時須用who(whom)，在指物時須用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】定語從句須用陳述句語序。關系副詞why在從句中作原因狀語，其先行詞是表示原因的reason。
16. Which is known to all, Mount Emei is one of the famous mountains of China.
【改】Which改為As。
【析】which, as都可作關系代詞引導非限制性定語從句，表示整個主句的內容，并在從句中作主語、賓語。這種從句放在主句的后邊時，which, as均可引導;放在主句的前邊時，一般用as引導。
17. Who are the persons who are sitting on the travel bags and which is the bag which belongs to me?
【改】將句中第二who和第二個which
都改為that。
【析】當主句是以who或which開頭的
特殊疑問句時，為了避免重復，定語從句要用that引導而不用who (whom)和which引導。
18. The woman who you spoke is an actress.
【改】在spoke之后加to。
【析】關系代詞who在定語從句中作介詞的賓語時，介詞須后置。如果介詞to前置，who得變為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之后加關系代詞who /
that。
【析】關系代詞在定語從句中作主語時
不能省略。