A picture of my family/A friend of his 请注意看这两个词中的代词啊怎么都不同呢?

a picture of my father this is a picture of my this is a picture of my house my mum took a picture of me this is a picture of my room.(对a picture of my room提问) This is a picture of my room.对picture of my room提问 This is a picture of my room 为什么填of a picture of my family 中的of 是什么用法啊? my picture和 picture of mine区别 There is a picture on the wall of my bedroom.____is a picture of my family.A.this B.it a picture of my family为什么不能说a family's picture? is,son,a,my,of,picture,this.连词成句 is brother a my of picture here连词成句 请翻译this is a picture of my room. It is a picture of my family tree 提问 this is a picture of my room.(对a picture of my room部分提问）大神们帮帮忙 The best of all gifts around any Christmas tree is the presence of a happy fami look!This is_______.A.a picture of my family B.my family picture 请问选A还是B 为什么?