按照句子后的要求改变句子
问题描述：
按照句子后的要求改变句子
7、Is that her English book?(改成复数)
8、Those aren't new buses.(改成单数)
9、It isn't his pencil-box?(改成复数)
答
Are those her English books?
That isn't a new bus.
They aren't his pencil-boxes .