定语从句是高中英语教学的重点、难点，也是高考的考点和热点。要做好定语从句题，可从下面几个技法入手。

第一招：选用关系代词。

                            who  >  that   >  which。

1.适用条件：定语从句中缺主语、宾语或表语时。

2.用法解析：who>that 指人时，优先选who；that>which指物时，优先选that。

3．注意：关系式存在的以下四个特殊条件：1）that 前面不用逗号或介词。2）that即可指人又可指物。3）who 本身是先行词时,引导词用that; that本身是先行词时,引导词用which。4）要避免重复使用同一个引导词。

  例1、Those ▁ dare to break the law will be punished.

         A、who    B、that  C、which  D、\

分析：选A。常规记忆为：当先行词是one、ones 、anyone或those 等时，用引导词who，不用that。而现在可用关系式who>that直接选择A。

  例2、The old man told us everything in the past ▁ he had experienced with.

         A、which  B、that  C、where    D、when

 分析：选B。常规记忆：当先行词是all、anything、everything、little、nothing等不定代词时，常用that不用which。现用关系式that>which可直接选B。

  例3、This is the cave___ the villagers often hid when the enemy came.

 A .which  B、in which  C、that  D、in that

分析:选B.由定语从句中缺宾语选BD.再由特殊条件1排除D, 而 选B。

  例4、She studied hard，when she was in school,___ contributes greatly to her career.

        A. t h a t         B. so       C. so that       D. which

   分析:选D. 由特殊条件1知,排除A可选D。

  例5、They often talk of the persons and the things ___ they can remember.

A. w h i c h        B. who     C.  t h a t        D. whom

分析:选C.先行词是the persons and the things .由特殊条件2,可选C.

 例6. He has found that ___ he was looking for.

A.  that          B. which    C. who      D.  whom

分析：选B。 that本身是先行词，由关系式特殊条件3可直选B。