Conditionals: Zero, First, Second & Third
En 4.º de ESO repasamos los condicionales ya conocidos y añadimos el Third Conditional, que se usa para hablar de situaciones pasadas que no ocurrieron: «Si hubiera estudiado más, habría aprobado.»
Repaso rápido de los tres primeros condicionales
| Tipo | Estructura | Uso | Ejemplo |
|---|
| Zero | If + Present, Present | Verdades / hechos | If you heat water, it boils. |
| First | If + Present, will + base | Posible / probable | If it rains, I'll stay home. |
| Second | If + Past Simple, would + base | Imaginario / improbable | If I were rich, I would travel. |
Third Conditional (Tercer condicional)
Se usa para hablar de situaciones pasadas que NO ocurrieron y sus consecuencias imaginarias. Son las «lamentaciones» o «arrepentimientos» del pasado: «Si hubiera hecho X, habría pasado Y.»
Estructura: If + Past Perfect, would have + participio pasado
| If (condición irreal pasada) | Resultado imaginario | Traducción |
|---|
| If I had studied harder, | I would have passed the exam. | Si hubiera estudiado más, habría aprobado. |
| If she had left earlier, | she wouldn't have missed the train. | Si hubiera salido antes, no habría perdido el tren. |
| If we had known about the party, | we would have gone. | Si hubiéramos sabido de la fiesta, habríamos ido. |
| If he hadn't eaten so much, | he wouldn't have felt sick. | Si no hubiera comido tanto, no se habría sentido mal. |
⚠️ ImportanteEl Third Conditional habla del pasado. No puedes cambiar lo que pasó. Solo imaginas qué habría sido diferente.
• ✅ If I had known, I would have helped. (Correcto: Past Perfect + would have + PP)
• ❌ If I would have known... (Error muy común)
Contracciones en el Third Conditional
📘 EjemploIf I'd known, I'd have helped.
(= If I had known, I would have helped.)
Cuidado: 'd puede ser had o would:
• If I'd known (= had known) → parte de if
• I'd have helped (= would have helped) → resultado
Los cuatro condicionales comparados
| Tipo | Probabilidad | Tiempo | Ejemplo |
|---|
| Zero | 100% | General | If ice melts, it becomes water. |
| First | Probable | Futuro | If she studies, she'll pass. |
| Second | Improbable / irreal | Presente/futuro | If I were president, I would change things. |
| Third | Imposible (no pasó) | Pasado | If I had studied, I would have passed. |
Mixed Conditionals (Condicionales mixtos) — Extra
A veces mezclamos las partes de diferentes condicionales:
📘 Ejemplo3rd + 2nd (pasado irreal → resultado presente):
If I had studied medicine, I would be a doctor now.
(Si hubiera estudiado medicina, sería médico ahora.)
2nd + 3rd (situación general → consecuencia pasada):
If I spoke French, I would have got that job.
(Si hablara francés, habría conseguido ese trabajo.)
📖 Reading comprehensionRead and reflect:
"If I had paid more attention in class, I would have understood the lesson better," said Carlos after failing his Maths exam. His friend Ana replied, "If you study harder next time, you'll pass. I'm sure of it."
"You're right," said Carlos. "If I had a time machine, I would go back and study more. But I can't change the past. If I start studying now, I'll be ready for the next exam."
"That's the spirit!" said Ana. "If you want, I can help you study this weekend. If we study together, we'll both do better."
Carlos agreed. He thought to himself: "If I hadn't met Ana, I wouldn't have such a good friend. She always helps me when I need it."
Questions:
1. Why did Carlos fail? ___
2. Identify the Third Conditional sentence Carlos says: ___
3. Identify the First Conditional Ana uses: ___
4. Identify the Second Conditional Carlos uses: ___
5. What does Carlos think at the end? (Which conditional type?) ___
✏️ Ejercicios1. Identifica el tipo de condicional:
a) If she had called me, I would have come. → ___
b) If it rains, the match will be cancelled. → ___
c) If I won the lottery, I'd buy a yacht. → ___
d) If you heat water to 100°C, it boils. → ___
e) If we had arrived on time, we wouldn't have missed the film. → ___
2. Completa con el tiempo verbal correcto:
a) If I ___ (have) more time, I would learn Japanese. (2nd)
b) If she ___ (study) harder, she would have passed. (3rd)
c) If it ___ (rain) tomorrow, we'll cancel the pícnic. (1st)
d) If you mix red and white, you ___ (get) pink. (Zero)
e) If I ___ (know) about the concert, I would have bought tickets. (3rd)
f) If he ___ (be) taller, he would play basketball. (2nd)
3. Traduce al inglés:
a) Si hubiera estudiado más, habría aprobado. → ___
b) Si yo fuera tú, aceptaría el trabajo. → ___
c) Si llueve mañana, nos quedaremos en casa. → ___
d) Si no hubieras llegado tarde, habrías visto la película. → ___
e) Si hubiera sabido la verdad, no habría dicho eso. → ___
4. Completa de forma original:
a) If I had been born in another country, ... (3rd/mixed)
b) If I could change one thing about the world, ... (2nd)
c) If I hadn't come to this school, ... (3rd)
d) If I pass all my exams, ... (1st)
📋 Resumen de la lección- Third Conditional: If + Past Perfect, would have + PP. Situaciones pasadas irreales.
- Expresa arrepentimiento o reflexión sobre lo que podría haber sido diferente.
- Zero (100%, general), First (probable, futuro), Second (improbable, presente), Third (imposible, pasado).
- Los Mixed Conditionals mezclan partes de diferentes condicionales.
- Error común: ❌ «If I would have...» → ✅ «If I had...»