YOU SAID:

My dad is stupid and will beat me if i fail

INTO JAPANESE

私の父は愚かであり、私が失敗した場合、私を打ち負かすだろう

BACK INTO ENGLISH

My father was stupid, and if I failed, he would beat me

INTO JAPANESE

私の父は愚かだった、と私が失敗した場合、彼は私を打ち負かすだろう

BACK INTO ENGLISH

My father was stupid, and if I failed, he would beat me