YOU SAID:

I made a promise that I'll never have to do this again

INTO JAPANESE

私は二度とこれをやる必要はないだろうという約束をした

BACK INTO ENGLISH

I promised that I will never need to do this

INTO JAPANESE

私はこれをする必要は決してないだろうと約束した

BACK INTO ENGLISH

I promised I would never need to do this

INTO JAPANESE

私はこれをする必要は決してないだろうと約束した

BACK INTO ENGLISH

I promised I would never need to do this