Use the future for predictions, promises, and future events. It can also express probability in the present ("¿Dónde estará?" — "Where could he be / I wonder where he is?").

Signal words: mañanael próximo añoprontoen el futuroalgún díacuando + subjunctive
Pronoun Future
yo dificultaré
dificultarás
él/ella/Ud. dificultará
nosotros dificultaremos
vosotros dificultaréis
ellos/ellas/Uds. dificultarán

Use the conditional for hypothetical situations ("would"), polite requests, reported speech about future events, and probability in the past ("Serían las 10" — "It must have been 10 o'clock").

Signal words: si + imperfect subjunctiveme gustaríaquisieradeberíapodríaen tu lugar
Pronoun Conditional
yo dificultaría
dificultarías
él/ella/Ud. dificultaría
nosotros dificultaríamos
vosotros dificultaríais
ellos/ellas/Uds. dificultarían
Key contrast

"Iré si tengo tiempo" (future — real possibility) vs "Iría si tuviera tiempo" (conditional — hypothetical). The conditional pairs with the imperfect subjunctive in if-clauses.

Future vs Conditional: common questions

What is the difference between future and conditional in Spanish?

The future expresses what will happen ("hablaré" — I will speak). The conditional expresses what would happen under certain conditions ("hablaría" — I would speak). The conditional is often used with "si" (if) clauses.

Do future and conditional share the same irregular stems?

Yes — all irregular verbs use the same modified stem for both tenses. For example, tener → tendr- (tendré / tendría), poder → podr- (podré / podría). Learn the stem once, apply it to both sets of endings.

Can I use the future tense to express probability?

Yes — the future of probability expresses a guess about the present. "¿Quién será?" means "Who could that be / I wonder who that is." Similarly, the conditional expresses probability about the past.

Practise both tenses with dificultar using spaced repetition.