一、“介詞+關係代詞which/whom”引導的定語從句
正式語體中，關係代詞作介詞賓語，常常把介詞置於關係代詞which/whom之前;非正式語體中，介詞可置於從句末。介詞的選擇取決於其與作先行詞的名詞、代詞的搭配或與定語從句中謂語動詞的搭配。有時候需要兼顧先行詞和定語從句中的動詞。
【考例】Many people who had seen the film were afraid to go to the forest when they remembered the scenes______people were eaten by the tiger.(廣東卷)
A.in which B.by which C.which D.that
此題中的介詞取決於前面的名詞scenes，構成in the scenes，故選A。
溫馨提示：“介詞+關係代詞”引導的定語從句要和“介詞+疑問代詞”引導的賓語從句區別開。兩種句子結構很相似，但亦有區別：“介詞+關係代詞”前面是名詞或代詞，而“介詞+疑問代詞”前面則是動詞或形容詞。
【考例】They way he did it was different ______we were used to. (江西卷)
A. in which B. in that C. from what D. from which
該題很容易讓同學們誤選D，把它看成“介詞+關係代詞”引導的定語從句。be different from是一形容詞短語，what引導賓語從句作介詞from的賓語，而不是from which引導的定語從句，故選C。
二、“介詞+關係代詞which+名詞”引導的定語從句
關係代詞在定語從句中一般充當主語、賓語或表語，有時候也可以充當定語。which可以指代一個名詞(詞組)、一個短語，也可以指代整個句子。而which所修飾的名詞(如time, case, city等)是對先行詞的內容起概括作用的名詞。
【考例】Mark was a student at this university from 1999 to 2003,______he studied very hard and was made Chairman of the Students' Union.(2005重慶卷)
A. during which time B. for which time C. during whose time D. by that time
which指代from 1999 to 2003這一短語的內容，time對前面的短語from 1999 to 2003起概括作用。這一短語又表示在短時間內，故選A。
三、“the+名詞+of+關係代詞which”引導的非限制性定語從句
這種結構中，of which充當定語，修飾前面的名詞，整個結構相當於“whose+名詞”引導的定語從句。
【考例】Recently I bought an ancient Chinese vase,______was very reasonable. (2000上海卷)
A. which price B. the price of which C. its price D. the price of whose
據題意，後文是對前面句中的名詞an ancient Chinese vase起補充說明的作用，故應是一個非限制性定語從句，which一般不作定語，C項前如加一個連詞and則成立，D項結構不正確，故選B，相當於whose price。
四、“the+形容詞比較級(最高級)+of+which/whom”引導的非限制性定語從句
【考例】There are two buildings,______stands nearly a hundred feet hight.(湖北卷)
A. the larger B. the larger of them C. the larger one that D. the larger of which
據題意，後部分是對前面名詞two buildings的補充說明，同學們很容易誤選B項，錯誤在於忽略了兩個簡單分句之間應該有關聯詞。答案為D，後部分相當於and the larger of them stands nearly a hundred feet high。
五、“代詞most, some, many, few, neither等+of+關係代詞which/whom”引導的非限制性定語從句
這種結構常用來引導非限制性定語從句，有時候也可把“of+關係代詞which/whom”置於代詞前。
【考例】I have many friends,______some arebusinessmen. (全國卷Ⅰ)
A. of them B. from which C. who of D. of whom
據題意，後部分是對前句中的名詞many friends起補充說明的作用，故選D。of whom引導非限制性定語從句，相當於一個並列分句and some of them are businessmen。
六、“數詞+of+關係代詞which/whom”引導的定語從句
這種結構也常用來引導非限制性定語從句，有時候也可以把“of+關係代詞which/whom”置於數詞前。數詞包括百分數和基數詞。
【考例】The factory produces half a million pairs of shoes every year,80%______are sold abroad.(遼寧卷)
A. of which B. which of C. of them D. of that
此題的後部分是對前部分中的名詞half a million pairs of shoes起補充說明的作用，屬於非限制性定語從句，在某個範圍裡用介詞of，故選A
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