1、Tom's
2、复数s结尾Teachers' Day,不以s结尾 Wonen's Day
3、分别拥有These are Tom's and Mike's rooms
4、共有This is Tom and Mike's mother.
5、无生命名次所有格多用of,a picture of our classroom
6、双重所有格He is a friend of my father's
7、时间等today's newspaper
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