Don't you understand what l mean?(回答 是的我不明白）—— ,l _______

Don't you understand what l mean?(回答 是的我不明白）—— ,l _______
Don't you understand what l mean?(回答 是的我不明白）—— ,l _______

Don't you understand what l mean?(回答 是的我不明白）—— ,l _______
No,I don't .
一般疑问句的否定回答,前面用No,主语后加助动词否定形式 don't.

No, I don't.