Why Spanish says 'la decisión de' where English says 'the decision to'
In English you can put a 'to' infinitive straight after many nouns: the decision to leave, a plan to travel, the hope to find work. Spanish does not allow this. When an infinitive tells you what the decision, plan or hope is, Spanish needs the little word de in between: la decisión de salir, el plan de viajar, la esperanza de encontrar trabajo.
English speakers tend to drop the linker completely (la decisión salir) or reach for a because it feels like English 'to' (la decisión a salir). Both are wrong. With nouns like intención, deseo, promesa and objetivo, the answer is almost always de.
Word list
tiempomA1timeno tengo tiempo de leer = I have no time to read (para also works)esperanzafA2hopela esperanza de encontrar trabajo = the hope of finding workformafA2wayla forma de hacerlo = the way to do itideafA2ideala idea de mudarse = the idea of movingmanerafA2wayla mejor manera de aprender = the best way to learnmodomA2wayel modo de usarlo = the way to use itplanmA2planel plan de abrir una tienda = the plan to open a shopsueñomA2dreamel sueño de ser actor = the dream of becoming an actorambiciónfB1ambitionla ambición de ganar = the ambition to wincorajemB1courageel coraje de decir la verdad = the courage to tell the truthdebermB1dutyel deber de votar = the duty to votedecisiónfB1decisionla decisión de marcharse = the decision to leavefinmB1aimcon el fin de mejorar = in order to improvemetafB1aimla meta de terminar este año = the goal of finishing this yearobjetivomB1aimel objetivo de reducir los gastos = the goal of cutting costsobligaciónfB1dutyla obligación de pagar = the obligation to payocasiónfB1opportunityla ocasión de conocerla = the opportunity to meet heroportunidadfB1opportunityla oportunidad de viajar = the opportunity to travelpodermB1powerel poder de decidir = the power to decideposibilidadfB1possibilityla posibilidad de elegir = the possibility of choosingpromesafB1promisela promesa de regresar = the promise to come backproyectomB1projectel proyecto de construir una escuela = the project to build a schoolvalentíafB1couragela valentía de denunciarlo = the bravery to report itvalormB1couragetener el valor de decirlo = to have the courage to say itamenazafB2threatla amenaza de dimitir = the threat to resigndeseomB2wishel deseo de aprender = the desire to learndeterminaciónfB2determinationla determinación de seguir = the determination to carry onexpectativafB2expectationla expectativa de ganar = the expectation of winningintenciónfB2intentionla intención de volver = the intention to returnintentomB2attemptun intento de escapar = an attempt to escapelibertadfB2freedomla libertad de elegir = the freedom to choosepretextomB2excusecon el pretexto de ayudar = on the pretext of helpingresoluciónfB2determinationla resolución de cambiar = the determination to changeresponsabilidadfB2responsibilityla responsabilidad de cuidar = the responsibility to look aftertener la intenciónB2to intendtener la intención de volver = to intend to returnvoluntadfB2willingnessla voluntad de ayudar = the willingness to helpnecesidadfC1necessityla necesidad de descansar = the need to restvoluntadfC1willla voluntad de colaborar = the will to cooperate
How it works
The pattern is simple: noun + de + infinitive. The infinitive fills in the content of the noun. Ask yourself: is this the decision, wish or plan itself? If yes, use de.
English hides the linker inside 'to', or uses 'of' with an -ing form (the idea of moving). Spanish always uses de plus the plain infinitive, never a gerund: la idea de mudarse, not la idea de mudándose.
Tomó la decisión de estudiar medicina.
(She made the decision to study medicine.)
The same goes for the very common phrase tener la intención de, which is how Spanish says 'to intend to'.
Tenemos la intención de volver el próximo año.
(We intend to return next year.)
The words
Plans and decisions
Plan, proyecto, decisión, intención, idea and promesa all describe something you have decided or intend to do. A similar word, propósito, works the same way.
Tienen el plan de abrir una tienda en el centro.
(They have a plan to open a shop in the town centre.)
No me gusta la idea de mudarnos otra vez.
(I don't like the idea of moving again.)
Cumplió la promesa de regresar antes de Navidad.
(He kept his promise to come back before Christmas.)
Goals
Objetivo, meta and fin name what you are aiming at. Fin appears mostly in the fixed phrase con el fin de, 'in order to'.
Nuestro objetivo de reducir los gastos parece difícil.
(Our goal of cutting costs looks difficult.)
Hablo con nativos con el fin de mejorar mi español.
(I talk to native speakers in order to improve my Spanish.)
Wishes, hopes and dreams
Deseo, esperanza, sueño and ambición express what someone wants.
Su sueño de ser actriz se hizo realidad.
(Her dream of becoming an actress came true.)
Todavía tengo la esperanza de encontrar trabajo aquí.
(I still have hope of finding work here.)
Will and effort
Voluntad, determinación, resolución and intento describe the will or the effort to do something.
Hizo un intento de escapar, pero lo vieron.
(He made an attempt to escape, but they saw him.)
Mostró una gran voluntad de ayudar.
(She showed a real willingness to help.)
Chances and duties
Oportunidad, ocasión, posibilidad, necesidad, obligación and responsabilidad also take de.
Tuve la oportunidad de viajar a México.
(I had the opportunity to travel to Mexico.)
Tenemos la obligación de pagar antes del viernes.
(We have an obligation to pay before Friday.)
Watch out
The typical mistake is a: la decisión a salir sounds wrong to native speakers. Save a for the few nouns that really take it, such as el derecho a ('the right to') and la disposición a ('readiness to'). A couple of others prefer para: permiso para ('permission to') and razón para ('reason to').
Be careful with de and para after plan or proyecto. Un plan de escapar says what the plan is: the plan consists of escaping. Un plan para escapar says what the plan is for: a plan designed to help you escape. Both exist, but for the content itself, use de.
When the person doing the action is different from the person who has the wish or hope, Spanish switches to de que plus the subjunctive: tengo la esperanza de que vuelvas ('I hope you come back').
Summary
When an infinitive tells you what a decision, plan, wish, goal or chance consists of, link it with de: la decisión de salir, el deseo de aprender, la oportunidad de viajar. Never leave the linker out, and do not translate English 'to' as a.