I don't have a ping--pong ball
We don't have a basketball
They don't have a new TV
They don't have many flowers
Mr Smith doesn't have a telephone
His aunt doesn't have a new TV
He doesn't have a nice room
There isn't an apple in the basket
There aren't some boys in ours classMr Smith doesn't havea telephonehave为什么变原型了呢主语是第三人称单数的否定句，要用助动词doesn't,后面的动词要改成原形把下列句子改成一般疑问句并作肯定和否定回答 I have a ping--pong ball We have a basketball They have a new TVThey have many flowersDo you have a ping--pong ball?Yes,I do.No,I don't.Do you have a basketball?Yes,I do.No,I don't.Do they have a new TV ?Yes,they do.No,they don't.Do theyhave many flowers?Yes,they do.No,they don't.Do you have a basketball? Yes,I do. No,I don't. 原句不是复数吗you 本身既可做单数你，也可做复数 你们