We have five volleyball改否定句
We don't have five volleyballs.
He has some soccer balls 一般疑问句..肯定句
Does he have any soccer balls? Yes,he does.
He plays basketball every day 改否定句
He doesn't play basketball every day.
Peter has a nice bag 对NICE BAG 提问
What does Peter have ?
Is that your watch? NO,it isn't变复数
Are those your watches? No, they aren't.