The classroom whose door/the door of which/of which the door is broken is on the second floor.
3．考查as/which引导的非限制性定语从句。尤其要重视which，as引导的非限制性定语从句和it，what引导的主语从句的区分。
4．考查定语从句中的主谓一致现象。如：
I, who am your close friend, will try my best to help you whenever you are in trouble.
5．考查“介词＋关系代词”引导的定语从句。“介词＋关系代词”引导的定语从句，关系代词指人时用whom，指物时用which，不能用that。关系代词作定语时也可用whose。如：
The teacher in front of whose house stands a tall tree is very patient with his students.
6．考查一些特殊的先行词。如：当situation, point, case, activity，scene及period, festival, occasion等出现时，要注意具体情况具体分析；作主语、宾语和表语时，用关系代词that/which; 作状语时，用关系副词where/when或“介词＋which”，表示在某种特定的情形下。
7．考查定语从句、强调句、时间状语从句等的区别。如：
The news that he had passed the exam pleased him and his family.(同位语从句)
The news (that) he told me this morning is not interesting. (定语从句)
