YOU SAID:

I've been studying Japanese for 5 years and I know nothing.

INTO JAPANESE

私は5年間日本語を勉強していますが、何も知りません。

BACK INTO ENGLISH

I've been studying Japanese for five years and I don't know anything.

INTO JAPANESE

私は5年間日本語を勉強していますが、何も知りません。

BACK INTO ENGLISH

I've been studying Japanese for five years and I don't know anything.