l think he has a ping-pong ball.改为否定句是什么?

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l think he has a ping-pong ball.改为否定句是什么?
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l think he has a ping-pong ball.改为否定句是什么?
l think he has a ping-pong ball.改为否定句是什么?

l think he has a ping-pong ball.改为否定句是什么?
l think he has not a ping-pong ball.改为否定句是什么?