YOU SAID:

i don't speak Japanese, do you speak English?

INTO JAPANESE

私は日本語を話せません、あなたは英語を話せますか？

BACK INTO ENGLISH

I can not speak Japanese, can you speak English?

INTO JAPANESE

日本語を話すことができない、あなたは英語を話すことができますか。

BACK INTO ENGLISH

I can not speak Japanese, can you speak English?