Soy listo, soy lista: clever, not ready (ready is estoy listo)

Shout soy listo when your friends are waiting at the door and you've told them you're a genius.

You said
¡Soy listo, vámonos!
What it means: I'm clever, let's go!
A local says
¡Estoy listo, vámonos!
I'm ready, let's go!
Why: With ser, listo means clever. For ready, use estar: estoy listo.
Friends waiting by the door in Guadalajara
¡Soy listo, vámonos!
"Sí, muy listo, pero llevamos media hora esperándote."

Listo is one of a handful of adjectives that change meaning with the verb. With ser it describes what someone is like: es muy lista means she's very clever. With estar it describes a state right now: está lista means she's ready. Same word, two different sentences.

The rule behind it: ser for characteristics, estar for conditions. Being clever is part of who you are. Being ready is how things stand at this moment, and it'll change in an hour. The same logic makes soy aburrido (I'm boring) different from estoy aburrido (I'm bored).

Watch the agreement too: listo for a man, lista for a woman, listos for a group. And ¿Estás listo? or just ¿Listos? is how you'll hear people check you're ready to go.

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Also worth knowing

SpanishEnglish
¿Están listos? Ya nos vamos.Are you ready? We're leaving.
La comida está lista.The food is ready.
Tu hermana es muy lista.Your sister is very clever.

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Questions people ask

What is the difference between soy listo and estoy listo?

Soy listo means I'm clever. Estoy listo means I'm ready. Ser describes what you are like, estar how things are right now.

How do you say I'm ready in Spanish?

Estoy listo, or estoy lista for a woman. Ya estoy listo means I'm ready now. For a group: estamos listos.

Which other adjectives change meaning with ser and estar?

Aburrido (boring or bored), rico (rich or tasty), verde (green or unripe) and malo (bad, or ill in many places) are the common ones.