he has a ping-pong ball 改为一般疑问句
问题描述：
he has a ping-pong ball 改为一般疑问句
my pen is in my pencil case（对in my pencil case提问）
the ping-pong bat is under the chair(对the ping-pong bat提问）
bob likes volleyball(改为否定句）谢谢
答
Does he have a ping-pong ball
Where is your pen?
What is under the chair?
Bob doesn't like volleyball
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