For instance：a little boy
the teacher in the classroom(定语后置)
a smiling girl
The girl who is smiling is our class teacher.
=The girl is our class teacher.+She is smiling.
The boy is my brother. He is playing computer games.(who)
The boy who is playing computer games is my brother.
She is my grandmother.I should take care of her.(that)
She is my grandmother who/whom/that I should take care of.
This is the factory that I want to visit.
关系代词：which that who whom whose
关系副词：when where why
A doctor is a person. He looks after people’s health.
A doctor is a person who/that looks after people’s health.
Mr. White invited many friends to his party,He respected them much.
Mr. White invited many friends to his party who/whom/that he respected them much.
Nancy is the right person.You can depend on her.
Nancy is the right person on whom you can depend.
The girl is our monitor. Her father is a model worker.
The girl whose father is a model worker is our monitor.
(1)A doctor is a person who/that looks after people’s health.
(2)Mr.White invited many friends to his party who/whom/that he respected them much.
(3)Nancy is the right person on whom you can depend.
1.表示人的所有：The girl whose father is a model worker is our monitor.
2.表示物的所有：I like the room whose window looks out over the sea.
关系代词 关系词 先行词 在从句中成分
that sb./sth. 主/宾/表
who sb. 主/宾
whom sb. 宾
whose sb./sth. 定(表从属)
Most people have never heard of Tim Berners-Lee.He is not nearly as rich or famous Marc Andreesen,who was cofounder of Netscape,or Bill Gates,whose name has become a household word.
Berners-Lee,who works in a small office at the Massachusetts Institute of Technology,is the creator of the World Wide Web.The creation of the Web is so important that some people compare Berners-Lee to Johann Gutenberg,who invented printing by moveable type in the fifteenth century.
Berners-Lee was born in England in 1955.His parents,who helped design the world’s first commercially available computer,gave him a great love of mathematics and learning,
is this the girl is whose pronunciation the best in our class.
This is the girl whose pronunciation is the best in our class.
who talked with you the man my friend is
The man who you talked with is my friend.
The man who/that is very cool is my favorite singer ,Jay Chou.
The football star whose skills are excellent is Messi