YOU SAID:

my name is monkey but i dont really know for sure

INTO JAPANESE

私の名前は猿ですが、私は本当に確かに知らない

BACK INTO ENGLISH

My name is a monkey, but I certainly do not know for sure

INTO JAPANESE

私の名前は猿ですが、私は確かにわからない

BACK INTO ENGLISH

My name is a monkey, but I certainly do not understand

INTO JAPANESE

私の名前は猿ですが、私は確かに理解していません

BACK INTO ENGLISH

My name is a monkey, but I certainly do not understand