问题补充：
--Are they ( ) buuks?No,they are not .--They are ( ) buuks.
答案：
不知道你是不是写错单词了
要是你的buuks 写成books的话 可以是
Are they buying books?他们在买书吗?
No,they aren .不,
They are selling books.他们在卖书
其实可以有好多种答案的
======以下答案可供参考======
供参考答案1:
Are they seeing books? 他们是在看书吗?
No, they are not.不，不是。
They are reading books.他们不在读书。
供参考答案2:
Are they reading books? 他们在读书吗？
No,they aren . 不，
They are kissing books. 他们趴在书本上睡着了。
