I promise that

I promise that I'll call.

Je te promets que j’appellerai.

I promise that I'll be there tomorrow.

Je te promets que je serai là demain.

I promise that this will never happen again.

Je te promets que cela ne se reproduira plus jamais.

I promise that I'll be back.

Je promets que je reviendrai.

I promise that it won't take long.

Je te promets que ça ne prendra pas longtemps.

I promise that you won't regret it.

Je te promets que tu ne le regretteras pas.

I promise that I'll bring it right back.

Je te promets que je le rapporterai tout de suite.

I promise that I'll make it up to you.

Je te promets que je me rattraperai.

I promise that it won't happen again.

Je te promets que ça ne se reproduira plus.

I promise that I'll do that tomorrow.

Je promets que je ferai ça demain.