①形容词性物主代词(my,your, his, her, its, our, their)
my pen
their school
②有生命物体的所属关系——'s(以s结尾的名词所有格,一般只在名词右上角加')
Hannah's mother
the teachers' office
③无生命物体的所属关系——of(有些表时间/距离/国家/城市/团体/机构等无生命东西的名词,也可以加上's来构成所有格)
the name of the film
today's newspaper
eight hours' work
④一一对应有针对性“的”——to
the key to the door
the answer to the question