YOU SAID:

I only know, that I don't know anything

INTO JAPANESE

私は何も知らないことを知っているだけです

BACK INTO ENGLISH

I just know I don't know anything

INTO JAPANESE

私は何も知らないことを知っています

BACK INTO ENGLISH

I know i don't know anything

INTO JAPANESE

何も知らない

BACK INTO ENGLISH

I don't know anything

INTO JAPANESE

何も知らない

BACK INTO ENGLISH

I don't know anything