you can see my family at home 为什么加at

you can see my family at home 为什么加at
you can see my family at home 为什么加at

you can see my family at home 为什么加at
介词 在家

at是介词 不加就有语法错误 at home是固定搭配 如果是in 应该是in the home

at home是固定搭配
就像in school

。。。习惯吧