句型转换。
①Alan is my father and Helen is my mother.（改为同义句）
Alan and Helen _____ my _____.
②This is his friend.（改为复数形式）
_____ _____ his _____.
③Those are her brothers.（改为一般疑问句）
_____ _____ her ______ ?
④He is my brother.（改为一般疑问句）
_______________________________________
⑤Is this his daughter?（作肯定回答）
_______________________________________
⑥Those are erasers.（改为单数形式）
_______________________________________
⑦Are these your sons?（改为陈述句）
_______________________________________