YOU SAID:

I don't speak Japanese. I speak Chinese.

INTO JAPANESE

私は日本語が話せません。私は中国語を話します。

BACK INTO ENGLISH

I can not speak Japanese. I speak Chinese.

INTO JAPANESE

私は日本語を話すことができません。私は中国語を話します。

BACK INTO ENGLISH

I can not speak Japanese. I speak Chinese.