YOU SAID:

im going to fail this final

INTO JAPANESE

私はこの決勝に失敗するつもりです

BACK INTO ENGLISH

I'm going to fail this final

INTO JAPANESE

私はこの決勝に落ちるだろう

BACK INTO ENGLISH

i will fall in this final

INTO JAPANESE

私はこの決勝で落ちます

BACK INTO ENGLISH

i will fall in this final