概念 :1. 在句子中修饰名词或代词 , 定语从句在句中充当定语 . 2. 定语从句必须有先行词 , 并尽量靠近先行词 . 3. 在定语从句中 , 关系词在从句中充当成分 .关系代词与关系副词关系代词 : 指人 : 指物 :指人或物 :关系副词 :who( 主格 ), whom( 宾格 ), whose( 所有格 )which( 主格 , 宾格 ), whose( 所有格 ) thatwhen, where, whywhose 在定语从句中作定语，表示引导词与 whose 后的名词为所属关系。 whose多指人，也可指物，指物时可与 of which互换使用。This is the book whose cover is blue.This is the book of which the cover is blue.注意 : 先行词有下列情况或附有下列修饰语时 , 通常用关系代词 that 。1) 先行词是 all, no, none, everyone, something, much, little 等；2) 先行词前有序数词 (the first…), 形容词最高级 (the best…), the last, the same, the only 等；3) 如果先行词中既含有表示人的名词又有表示物的名词时；4) 若主句中有疑问代词 who 或者 which ，为了避免重复 , 关系代词不要再用 who, which ，而用 that 。1. This is all ____ I know about the matter. A. that B. what C. who D. whether2. Is there anything else _____ you require? A. which B. that C. who D. what3. The last place _____ we visited was the Great Wall. A. which B. that C. where D. it4. He talked happily about the men and books_____ interested him greatly in the school. A. which B. that C. it D. whom5. There is no dictionary _____ you can find everything. A. where B. which C. that D. in that6. This is one of the best books _______. A. that have ever been written B. that has ever been written C. that has written D. that have written7. Is oxygen the only gas _____ helps fire burn? A. that B. / C. which D. it限制性定语从句和非限制性定语从句：My sister, who is twenty, works in a bank.The man who came here yesterday has come again.限制性定语从句是先行词在意义上不可缺少的定语， 如果去掉，主句的意思...
