this is a photo of my family 为什么要加a呢

this is a photo of my family Is this a photo of your family? This is a photo of her family 对a photo of her family 提问 This is a photo of his family 对 photo of his family 进行提问 This is a photo of（）〔MINE或ME of,this,class,is,a,my,photo连词成句, This is a photo of my family.的下一句? This is a photo of my daughter.She _____ (dance) This is a photo of my family.变复数 photo,is,my,of,father,this,a连词成句 of this class is a your photo 连词成句 a,our,photo,is,this,school,of 连词成句 This is a photo of his family .同义句. classroom,is,photo,this,a,our,of(?)连词成句 this,is,photo,family,your,a,of连成一般疑问句 This is a photo of my (添house还是home) this is a photo of hei family 改为同义句 is friend a his of photo this 连词成句