How to Say "you promised" in Spanish
The Spanish word for “you promised” is “prometiste” — A2 level. This is a very common word in everyday Spanish.

Examples
Prometiste llamarme tan pronto como llegaras.
You promised to call me as soon as you arrived.
¿Por qué no cumpliste lo que prometiste?
Why didn't you keep what you promised?
Ella me dijo que tú prometiste guardar el secreto.
She told me that you promised to keep the secret.
The 'Tú' Past Tense
This form, 'prometiste,' is used when you are speaking directly to a friend or someone you know well ('tú') about an action they completed in the past. It’s the simple, finished past.
Regular -ER Verb Pattern
Since 'prometer' is a regular -er verb, its past tense endings follow a predictable pattern. Learning 'prometiste' helps you conjugate hundreds of other similar verbs like 'comer' (comiste) and 'beber' (bebiste).
Preterite vs. Imperfect
Mistake: “Using 'prometías' instead of 'prometiste' for a single event.”
Correction: Use 'prometiste' (Preterite) when the promise was a single, finished event. 'Prometías' (Imperfect) is only used if you were talking about promising repeatedly or habitually in the past.
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