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There are many students' exercise books here.

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There are many students' exercise books here.
为什么students要加 ’.请说明理由.清楚一点.
我听说是因为那个单词本身就是个复数就加’s。例如children's day。
There are many students' exercise books here.
ooks是复数,那么学生肯定不止一个,用students,也是复数,复数是以“s”结尾的所有格打一撇就是的啦,children是复数,但是不是s结尾
所以是students'