I promise you
A more serious or formal way to say 'I give you my word.'
A much stronger phrase meaning 'I swear it.' Use this for very serious situations.
Means 'Trust me.' Use it to reassure someone, similar to making a promise.
The formal version for 'usted' (you, formal). Use it with elders or in professional settings.
I will call later, I promise you.
I'm not going to tell anyone your secret. I give you my word.
I didn't break the glass, I swear it!
Ma'am, your order will arrive on time. I promise you.
The phrase 'Te lo prometo' is universally understood and used across all of Latin America for informal situations (tú). 'Se lo prometo' is used for formal situations (usted).
In addition to 'Te lo prometo' (for one person), you will frequently hear 'Os lo prometo' when promising something to a group of friends ('vosotros').
While 'vos' is used instead of 'tú' for the subject, the object pronoun remains 'te.' So, the phrase is still 'Te lo prometo,' even in a sentence like 'Vos sabés que es verdad, te lo prometo.'
Using 'Yo prometo tú'. — This is a direct word-for-word translation. Spanish requires object pronouns placed before the verb. The correct structure is 'Te lo prometo' (To you, it, I promise).
Using 'Te prometo lo'. — The order of pronouns is incorrect. In Spanish, the indirect object pronoun ('te' - to you) comes before the direct object pronoun ('lo' - it). The correct order is always 'te lo'.
Using 'jurar' (to swear) for a simple promise. — 'Lo juro' is much stronger than 'Te lo prometo.' Reserve 'jurar' for situations where you need to strongly insist on your truthfulness, like an oath. For everyday promises, 'prometer' is the right choice.