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)
_______________________________________