What are those?(改为单数句）

What are those?(改为单数句） What are those?___They are books.(改为单数句） What are those in English?（改为单数句） what are those?改为单数 Those are oranges（改为单数句） Those are erasers.(改为单数句） Those are eggs.（改为单数句） -What are those?-They are pencil-boxes.(改为单数句） Those are English girls(改为单数句） Those scarves are mine.(改为单数句） Those are orange说（改为单数句） Those are their teachers.（改为单数句）