Is she your mother?复数形式

Is she your mother?复数形式 Is she your friend的复数形式 Is she your friend?写出下列句子的复数形式 Is she your sister?怎么变成复数形式 She is your mother' mothre.She is Ls she your cousin改为复数形式 this your book改复数,单复数句型各变疑问句.she is my mother.变疑问句,否定回答 t she is a good student.改为复数形式 Is your sister quiet?肯定回答 （）is your mother?she is fine How is your mother now?She is is this your mother?yes,she is ()()your mother ()?She is a teacher .