Saying 'ready to' and 'useful for' with 'para' + infinitive
When a Spanish adjective says that someone is ready for something, or that a thing is good, useful or suitable for a purpose, the activity usually follows as para + infinitive: listo para salir, útil para aprender, adecuado para trabajar. The word para points to the goal or intended use, and the verb after it always stays in its basic infinitive form.
English speakers trip over this because English does not use one fixed pattern. We say ready to leave but useful for learning. That leads to two typical mistakes: dropping the preposition (listo salir) or translating for + -ing word for word with a gerund (útil para aprendiendo). In Spanish both English patterns become the same thing: para + infinitive.
Word list
buenomA1goodbueno para dormir = good for sleepingexcelenteA1greatexcelente para aprender = excellent for learningimportanteA1importantimportante para aprender = important for learningmalomA1badmalo para dormir = bad for sleepingdisponibleA2availabledisponible para trabajar = available to workestupendomA2greatestupendo para descansar = great for relaxingfantásticomA2greatfantástico para pasear = fantastic for walkinggenialA2greatgenial para viajar = great for travelingnecesariomA2necessarynecesario para viajar = necessary for travelingpeligrosomA2dangerouspeligroso para nadar = dangerous to swim inperfectomA2perfectperfecto para descansar = perfect for relaxingseguromA2safeseguro para nadar = safe to swim (but seguro de = sure of)suficienteA2enoughsuficiente para comprar = enough to buyútilA2usefulútil para aprender = useful for learningadecuadomB1suitableadecuado para trabajar = suitable for workingapropiadomB1suitableapropiado para estudiar = suitable for studyingefectivomB1effectiveefectivo para reducir = effective at reducingeficazB1effectiveeficaz para eliminar = effective at removingeficienteB1efficienteficiente para procesar = efficient for processingesencialB1importantesencial para entender = essential for understandinghorribleB1awfulhorrible para dormir = awful for sleepinginútilB1uselessinútil para resolver esto = useless for solving thislistomB1preparedlisto para empezar = ready to startmagníficomB1greatmagnífico para descansar = wonderful for relaxingpreparadomB1preparedpreparado para salir = ready to leaveterribleB1awfulterrible para conducir = terrible for drivingimprescindibleB2indispensableimprescindible para entrar = essential for getting ininadecuadomB2unsuitableinadecuado para vivir = unfit to live ininapropiadomB2unsuitableinapropiado para realizar = unsuitable for doingindispensableB2indispensableindispensable para trabajar = indispensable for workingpésimomB2awfulpésimo para estudiar = terrible for studyingprovechosomB2usefulprovechoso para mejorar = beneficial for improvingidóneomC1suitableidóneo para resolver = ideal for solving
How it works
The construction is simple: adjective + para + infinitive. The adjective agrees with the person or thing it describes, while the infinitive never changes.
English to + verb: ready to start becomes listo para empezar.
English for + -ing: good for relaxing becomes bueno para relajarse.
Rule of thumb: if the adjective is about readiness, usefulness, suitability or effectiveness, and you want to name the purpose with a verb, reach for para. The same para also works with a noun: listo para el examen, útil para el trabajo.
¿Estás lista para salir?
(Are you ready to leave?)
Este programa es útil para aprender vocabulario.
(This program is useful for learning vocabulary.)
The words
Ready
Listo and preparado both mean ready or prepared. Use them with estar.
Los niños ya están preparados para ir al colegio.
(The kids are ready to go to school now.)
Estamos listos para empezar.
(We're ready to start.)
Useful or useless
Útil is the everyday word. Provechoso is a little more formal and suggests real benefit. Inútil is the opposite.
Leer en voz alta es provechoso para mejorar la pronunciación.
(Reading aloud is beneficial for improving your pronunciation.)
Este mapa es inútil para encontrar la calle.
(This map is useless for finding the street.)
Suitable or unsuitable
Adecuado and apropiado mean suitable or right for the purpose. Idóneo is more formal and close to ideal. Perfecto is the friendly everyday version. The negatives are inadecuado and inapropiado.
Esta mesa no es adecuada para trabajar, es muy baja.
(This table isn't suitable for working at. It's too low.)
La biblioteca es un lugar apropiado para estudiar, y este parque es perfecto para descansar.
(The library is a suitable place to study, and this park is perfect for relaxing.)
Ana es la persona idónea para resolver el problema.
(Ana is the ideal person to solve the problem.)
El edificio es inadecuado para vivir, y esta herramienta es inapropiada para realizar esa tarea.
(The building is unfit to live in, and this tool is unsuitable for doing that job.)
Effective and efficient
Eficaz and efectivo mean that something gets the result you want. Eficiente means it does so without wasting time or resources.
Este producto es eficaz para eliminar manchas, y las ventanas nuevas son efectivas para reducir el ruido.
(This product is effective at removing stains, and the new windows are effective at reducing noise.)
Necesitamos un ordenador más eficiente para procesar datos.
(We need a more efficient computer for processing data.)
Good, bad, necessary, enough
Very common adjectives follow the same pattern when they describe a purpose: bueno, malo, necesario and suficiente.
El té es bueno para dormir, pero el café es malo para dormir.
(Tea is good for sleeping, but coffee is bad for sleeping.)
El dinero no es suficiente para comprar un coche, pero es necesario para viajar.
(The money isn't enough to buy a car, but it's necessary for traveling.)
Watch out
Never a gerund
English -ing after for is always an infinitive in Spanish: útil para aprender, not útil para aprendiendo.
Ready vs. willing
Listo para salir means you are ready to go. Being willing to do something uses a: dispuesto a salir.
Ser listo vs. estar listo
Estar listo para means to be ready. Ser listo means to be clever.
Easy to do
Adjectives like fácil and difícil, used for how easy something is to do, take de: fácil de usar. Compare útil para usar in a purpose sense.
Other prepositions are possible
With a noun naming an area, you may also hear eficaz en or eficiente en (eficiente en su trabajo). For a purpose expressed with a verb, para is the safe choice.
Too and enough
Para also follows demasiado + adjective: Es demasiado joven para votar (He's too young to vote). Similar adjectives, such as apto, behave the same way.
Summary
When an adjective says something is ready, useful, suitable, effective, good or bad for a purpose, put the activity after para + infinitive. English ready to leave and useful for learning both become the same Spanish pattern: listo para salir, útil para aprender. Never use a gerund after para, and never leave the preposition out.