Why aren't you listening

Teacher: Jack, why aren't you listening?

Jack: But, teacher, I'm listening.

Teacher: If you were listening, tell me what I said just now.

Jack: You said, "Jack, why aren't you listening?"

老师：杰克，你为什么不认真听课?

杰克：老师，我正在听课呀!

老师：如果你刚才在听课，那告诉我刚才我说的什么。

杰克：您说的是：“杰克，你为什么不认真听课?”