YOU SAID:

A deal is a promise, and a promis is unbreakable

INTO JAPANESE

契約は約束であり、約束は破られない

BACK INTO ENGLISH

Contracts are promises, promises are not broken

INTO JAPANESE

契約は約束であり、約束は破られません

BACK INTO ENGLISH

The contract is a promise, the promise is not broken

INTO JAPANESE

契約は約束です、約束は破られません

BACK INTO ENGLISH

The contract is a promise, the promise is not broken