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.
You should move to Japan!