How to Say "promise me" in Spanish
The Spanish word for “promise me” is “prométeme” — A2 level. This is a very common word in everyday Spanish.

Examples
Por favor, prométeme que nunca me dejarás solo.
Please, promise me that you will never leave me alone.
Prométeme que estudiarás para el examen de mañana.
Promise me that you will study for tomorrow's exam.
Si vas, prométeme que me llamarás tan pronto llegues.
If you go, promise me you'll call me as soon as you arrive.
The Glued-On Pronoun
When you give a direct command (like 'promete'), any small word that receives the action (like 'me,' 'te,' or 'lo') must be 'glued' directly onto the end of the verb.
The Stress Mark
The original command form is 'promete' (stress on the first 'e'). When you add 'me,' you add a syllable, so Spanish needs the accent mark ('prométeme') to keep the stress on the same place.
Separating the Command
Mistake: “Me promete que irás.”
Correction: Prométeme que irás. (The pronoun 'me' must attach to the affirmative command.)
Missing the Accent
Mistake: “Prometeme.”
Correction: Prométeme. (Without the accent, the stress shifts to the wrong syllable, changing how the word sounds.)
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