don't say so咋用？

口语，表示惊讶，意为“真的吗”、“不会吧”、“什么”等，只是情感的表示，可以回答多种问题。
eg.To tell you the truth,I became a college student at 15."
You don't say so .

eg：--It's so kind that you helped me!
--Don't say so.
用语回答他人的感谢等。

同中文 不要这样说