题目内容：

where's the bag?I don't know
ts is on the dresser?No,it isn't
变复数!把包,变包（复数）
Where are my book?I don't konw.Are they on the bed?
No,thy're not.
变复数或者单数!（上面的是复数就变单数,上面的是单数就变复数）