This is my father and my mother.这句话是正确的,为什么?如题,我知道这句话是正确的,谁能告诉我一下为什么用is,不用they are.

This is my father and my mother this is my father .my father 画线,并提问. is,an,writing,father,e-mail,my this is my father,的中文意思 This is my father()改为否定句 ___is this?It is my father. this is my father yellow shirt 改错 This is my father.Where is_____?(you) this is my father.改为一般疑问句, This is my father‘s father.（写同义句） Miss li,this is my father.为什么用this is This is my grandfather.He is my (parents') father.对不对 ?! THIS IS MY UNCIE .THAT IS MY FATHER合并成一句 把my,father,mother,this,is,father,my,ahd,this,is连词成句 （ ）picture is this?It is my father is. this is bob .his father is my aunt.改错 hello!Miss Gao .this is my father为什么不是hello!MissGao .he is my father A:YOUR room is clean.B:thanks.i()is this morning.a:what is your father doing?b:he is ()an emaili()my grandparents last weekend.