How to Say "competent" in Spanish
The most common Spanish word for “competent” is “capaz” — use 'capaz' when describing someone who has the general skill, talent, or efficiency to do something, often implying a physical or inherent ability..
capaz
/ka-pas//kaˈpas/

Examples
Él es capaz de levantar 100 kilos.
He is capable of lifting 100 kilos.
Estoy segura de que eres capaz de aprobar el examen.
I'm sure that you are able to pass the exam.
Necesitamos una persona capaz y responsable para este trabajo.
We need a capable and responsible person for this job.
Always Use 'de' Before an Action
When you say someone is capable of doing something, you always need the word 'de' right after 'capaz' and before the action word. For example: 'Soy capaz de correr'.
One Form for Masculine & Feminine
'Capaz' is a cool adjective because it doesn't change for masculine or feminine. You say 'el hombre capaz' and 'la mujer capaz'. It stays the same!
Making it Plural
To talk about more than one person or thing, 'capaz' changes to 'capaces'. For example, 'Ellos son capaces'.
Forgetting 'de'
Mistake: “Ella es capaz hablar tres idiomas.”
Correction: Ella es capaz **de** hablar tres idiomas. Remember, 'capaz' needs its partner 'de' before an action.
capaces
kah-PAH-sess/kaˈpaθes/

Examples
Somos capaces de terminar el proyecto antes de la fecha límite.
We are capable of finishing the project before the deadline.
Mis estudiantes son muy capaces; aprenden rápido.
My students are very able; they learn quickly.
Los nuevos sistemas son capaces de procesar millones de datos por segundo.
The new systems are capable of processing millions of data per second.
Plural Form
This word is the plural form of the adjective 'capaz'. You use it when describing more than one person or thing.
Using SER
You always use 'capaces' with the verb 'ser' (Somos capaces, Son capaces) because capability is seen as a permanent, inherent quality or skill.
Singular vs. Plural
Mistake: “Los niños son capaz.”
Correction: Los niños son capaces. (Always match the number: plural subject needs the plural adjective.)
Singular vs. Plural 'Capaz'
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