( 十一 ) 定语从句一、关系代词引导的定语从句 关系代词 who ， whom ， whose ， which ， that 引导定语从句 时，可在从句中作主语、宾语、定语等句子成分
who代指 人，作主语或宾语； whom 代指人，作动词宾语或介词宾 语； whose 代指人 ( ＝ of whom) 或物 ( ＝ of which) ，作定语； which 代指物，作主语或宾语； that 代指人或物，作主语、宾 语或表语
This is the detective who came from London
The book which/that I am reading is written by Thomas Hardy
The desk whose leg is broken is very old
He is no longer the boy that he used to be two years ago
使用关系代词时应注意以下几点： (1)“ 介词＋关系代词”可以引导定语从句，但关系代词只可用 whom 或 which ，不可用 who 或 that
The room in which there is a machine is a workshop
In the dark street ， there wasn’t a single person to_whom she could turn for help
(2)“whose ＋ n
” 引导定语从句时，可换成“ the ＋ n
＋ of whom/which” 或“ of which ＋ the ＋ n
He lives in a big house whose window faces the sea
He lives in a big house the window
