Ways to say it: Expressing a promise

Asking for a promise :

• Promise me that you will get me at all the water that I can drink
• Do you promise to take care of the bird if we get one?
• Make me a promise, won't you?
• I want you to promise that you'll love me forever
• Is that a promise?
• Do you give me your word on that?
• Do you swear that you won't forget me?

Offering a promise :

• I promise I'll do whatever you want
• I promise you that I'll try to be on time next time
• I promise to love you endlessly
• It's a promise
• I give you my word on that
• You have my word on it
• I swear that my love is only for you

Source : Look Ahead