Revision : Exercise (抢答)
Yuan Longping is a great scientist _________________ we should learn from.Is this the key ___________ you are looking for?Bai Sha middle school is the school _________ I am studying now.
whom/ who/that
which/ that
where
定语从句：介词+关系代词
介词+关系代词
1. 用法  关系代词在定语从句中作介词宾语时, 从句常常由 “介词+关系代词”引导2. 结构  先行词是人用 “介词+whom”  先行词是物用 “介词+which”e.g. The school in which he once studied is very famous.
The girl about whom we are talking is a doctor.
我们正在谈论的那个女孩是个医生。
他曾经上学的学校非常著名。