How to Say "fill!" in Spanish
The Spanish word for “fill!” is “llena” — A2 level. This is a very common word in everyday Spanish.
Examples
Ella siempre llena el tanque de gasolina los lunes.
She always fills the gas tank on Mondays.
¡Llena la bañera rápido, el agua se está enfriando!
Fill the bathtub quickly, the water is getting cold!
Usted llena el formulario en la recepción.
You (formal) fill out the form at the reception desk.
Regular -AR Verb
This is a very common, regular verb. Once you learn the pattern for llenar, you can use the same endings for hundreds of other verbs like hablar or cantar.
Using 'Llenar' instead of 'Rellenar'
Mistake: “Voy a llenar el vaso otra vez. (A little awkward if it was already full once)”
Correction: Voy a rellenar el vaso. (Correct). Use the prefix 're-' (rellenar) when you mean 'to fill again' or 'to refill'.
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