YOU SAID:

I don't speak anything other than English

INTO JAPANESE

私は英語以外は話せません

BACK INTO ENGLISH

I can not speak except English.

INTO JAPANESE

私は英語以外で話せません。

BACK INTO ENGLISH

I can not speak outside of English.

INTO JAPANESE

私は英語の外で話すことはできません。

BACK INTO ENGLISH

I can not speak outside of English.