How to Say "i used" in Spanish
The Spanish word for “i used” is “usé” — A1 level. This is a very common word in everyday Spanish.

Examples
Yo usé tu bolígrafo sin preguntar, lo siento.
I used your pen without asking, I'm sorry.
Para el viaje, usé la mochila más grande.
For the trip, I used the biggest backpack.
El mes pasado, usé todos mis días de vacaciones.
Last month, I used all my vacation days.
The Simple Past (Preterite)
This form ('usé') is the simple past tense. You use it for actions that started and finished completely at a specific point in time, like 'I used it yesterday.'
The Essential Accent Mark
The accent on the 'é' is vital! It changes the meaning from the present tense ('yo uso' - I use) to the past tense ('yo usé' - I used).
Confusing Past Tenses
Mistake: “Using 'usaba' when you mean a single, completed action.”
Correction: Use 'usé' for a single event ('I used the key once'). Use 'usaba' only for ongoing or habitual past actions ('I used to use that key often').
Related Translations
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