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

Examples
Hemos notado tu ausencia en la reunión.
We have noticed your absence from the meeting.
¿Habías notado que la puerta estaba abierta?
Had you noticed that the door was open?
Ella dice que no ha notado nada extraño.
She says she hasn't noticed anything strange.
Building Perfect Tenses
This form ('notado') is always paired with a form of the helping verb 'haber' (to have) to talk about actions completed in the past, like 'he notado' (I have noticed) or 'habíamos notado' (we had noticed).
Changing the Ending
Mistake: “Using 'notado' with 'haber' and changing the ending (e.g., 'Hemos notados').”
Correction: The past participle used with 'haber' never changes its ending: it is always 'notado' (or 'notado,' 'comido,' etc.). Say: 'Hemos notado la diferencia.'
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