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五、混淆關系代詞與關系副詞
有的同學一看到先行詞是表示時間、地點、原因的名詞，就認為一定要用關系副詞，其實也一定。在此情況下，還要看關系詞在定語從句中是用作什么成分，若是用作狀語，則用關系副詞，若不是用作狀語(如用作主語、賓語等)則不能用關系副詞，而用關系代詞。比較：
This is the factory where I want to work. 這就是我想工作的工廠。(work為不及物動詞where在從句中用作狀語)
This is the factory that I want to visit. 這就是我想?yún)⒂^的工廠。(visit為及物動詞，that用作visit的賓語)
The reason why he can’t come is that he is ill. 他沒來的是因為他病了。(come為不及物動詞，why在定語從句中用作狀語)
The reason that he put forth is very important. 他提出的理由很重要。(put forth為及物動詞，that在定語從句中用作其賓語)
六、因逗號誤判which
有的同學一看見逗號，就以為一定要選which而不選that，但問題是有時根本就不是定語從句：
(1) If a book is in English, _____ means slow progress for you.
A. as B. which C. what D. that
(2) When I say two hours, _____ includes time for eating. (D19/541)
A. as B. which C. what D. that
【分析】以上兩題均應選that，而不能選which，因為它們根本不是定語從句。之所以選that，是因為句中已有if和when引導的狀語從句，逗號后為主句，that為主句主語。
七、混淆which與whose
兩者在定語從句中都可用作定語，區(qū)別是：whose 的意思相當于 one’s，而 which 的意思則相當于 that 或 this。比較：
(1) This is Mary, whose [= and her] father we met last week.
(2) Call again at 11, by which time [= and by that time] the meeting should be over.
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