YOU SAID:

I am most certainly sure that this works incorrectly

INTO JAPANESE

私はこれが間違って機能することを最も確実に確信

BACK INTO ENGLISH

I'm sure most sure that this will work wrong

INTO JAPANESE

私はこれがうまくいかないだろうと確信して

BACK INTO ENGLISH

I am convinced that this will not work

INTO JAPANESE

私はこれがうまくいかないと確信しています

BACK INTO ENGLISH

I am convinced that this will not work