¿Para qué se usa el first conditional?

El first conditional describe una situación futura real y probable, y su resultado esperado: if más present simple en la condición, will más verbo base en el resultado, como en If it rains, we will stay home. Will nunca aparece en la cláusula con if, solo en la del resultado, y would pertenece al second conditional, no a este.

¿Este test de first conditional incluye soluciones?

Sí. En los cinco ejercicios, las 50 preguntas muestran la respuesta correcta y una breve explicación al comprobarlas, para que entiendas exactamente por qué encaja la forma del first conditional. El test es completamente gratuito y no necesita registro para empezar a practicar ahora mismo.

¿Cómo practico el first conditional de inglés en nivel B1?

Lee primero la lección con la regla y los ejemplos, y después haz los ejercicios. En cada frase comprueba que la cláusula con if usa el present simple y que la del resultado usa will, nunca al revés, y busca siempre una situación futura real y posible.

Why can the if-clause never use will?

The if-clause states the condition using the present simple, even though the meaning is future. Will only appears in the result clause, for the probable outcome.

Can the result clause come before the if-clause?

Yes. You will pass if you study hard means the same as If you study hard, you will pass. Only use a comma when the if-clause comes first.

First Conditional – Gramática Inglés B1 (con Soluciones)

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Preguntas y respuestas de práctica

Todas las preguntas de nivel B1 para “First Conditional – Ejercicios de Gramática Inglés B1 con Soluciones”, cada una con la respuesta correcta y una breve explicación. Prueba los ejercicios interactivos de arriba y comprueba tus respuestas aquí.

✅ Correct	❌ Wrong
If it rains, we will stay home.	If it will rain, we will stay home.

First Conditional: Real Future Possibilities

1. If she ___ the bus, she will be late for work.
- A. misses ✓
- B. will miss
- C. would miss
- D. is missing
Respuesta: misses
The if-clause always uses the present simple, misses, even though the meaning is future.
2. If you send the email today, I ___ it tomorrow morning.
- A. read
- B. will read ✓
- C. would read
- D. am reading
Respuesta: will read
The result clause needs will plus the base verb for a likely future outcome.
3. If they do not book early, the tickets ___ very expensive.
- A. would be
- B. are being
- C. will be ✓
- D. are
Respuesta: will be
Will be states the likely result of the condition; are alone just states a fact.
4. If the weather stays clear, the flight ___ on time.
- A. would leave
- B. leaves
- C. is leaving
- D. will leave ✓
Respuesta: will leave
The result clause takes will plus the base verb for the probable outcome.
5. If the shop ___ open late, we will buy the tickets tonight.
- A. stays ✓
- B. will stay
- C. stayed
- D. is staying
Respuesta: stays
The if-clause needs the present simple, stays, never will, even though the time is future.
6. If we leave now, we ___ the beginning of the film.
- A. see
- B. will see ✓
- C. would see
- D. are seeing
Respuesta: will see
The result clause uses will see, the normal form for a likely future result.
7. If he does not apologise, she ___ him.
- A. does not forgive
- B. is not forgiving
- C. will not forgive ✓
- D. would not forgive
Respuesta: will not forgive
Will not forgive gives the likely negative result; would not forgive suits an unreal situation instead.
8. ___ you finish the project if the client sends the files today?
- A. Would
- B. Are
- C. Do
- D. Will ✓
Respuesta: Will
A first conditional question about the result starts with will before the subject.
9. If it rains tomorrow, the match ___ cancelled.
- A. will be ✓
- B. is
- C. would be
- D. was
Respuesta: will be
Will be states the probable result of a real future condition; is alone sounds too certain.
10. If she studies every day, she ___ real progress by June.
- A. makes
- B. will make ✓
- C. would make
- D. is making
Respuesta: will make
Will make is the result clause form for a realistic future outcome, not makes alone.

Word Order: Where Will Belongs

1. if / it / rains / we / will / stay / home
Respuesta: If it rains, we will stay home.
Will never goes in the if-clause; it belongs only with stay home, the result.
2. if / you / study / hard / you / will / pass
Respuesta: If you study hard, you will pass.
The if-clause keeps the base form, study; will pass is the separate result clause.
3. she / will / call / if / she / has / time
Respuesta: She will call if she has time.
Here the result clause comes first; has, not will have, still marks the condition.
4. if / they / do / not / hurry / they / will / miss / the / train
Respuesta: If they do not hurry, they will miss the train.
Do not hurry is the negative present simple condition; will miss states the likely result.
5. will / we / arrive / late / if / the / train / is / delayed
Respuesta: Will we arrive late if the train is delayed?
A first conditional question starts with will before the subject, then the base verb.

Common First Conditional Mistakes

1. Which option does not belong?
- A. If it rains, we will stay home.
- B. If she studies, she will pass.
- C. If it will rain, we will get wet. ✓
- D. If they hurry, they will catch the bus.
Respuesta: If it will rain, we will get wet.
Will never appears in the if-clause; the correct form is If it rains, we will get wet.
2. Which option does not belong?
- A. If you call me, I will answer.
- B. If he arrives late, the manager will be angry.
- C. If we save enough, we will travel next year.
- D. If she will finish early, she will help you. ✓
Respuesta: If she will finish early, she will help you.
The if-clause needs the present simple, finishes, not will finish; will belongs only to the result.
3. Which option does not belong?
- A. If it rains, we would stay home. ✓
- B. If you practise daily, you will improve fast.
- C. If the shop closes early, we will miss it.
- D. If they invite us, we will go gladly.

First Conditional in Context: Mountain Safety Rules

1. Mount Everest rises to 8,849 metres, and expert guides lead climbers toward its summit every spring. If the weather _____ (turn) bad, the guides will stop the climb at once.
Respuesta: turns
The if-clause takes the present simple turns, even though the weather change is still in the future.
2. Every climber must listen carefully to instructions. If a storm arrives suddenly, the guides _____ an immediate return to base camp.
- A. order
- B. will order ✓
- C. would order
- D. will ordering
Respuesta: will order
This is the result clause, so it needs will plus the base verb. Plain order would lose the future meaning.
3. Altitude affects people in very different ways. If a climber _____ not feel well, the guide will turn back with them.
Respuesta: does
A negative if-clause uses does not, never will not. Will belongs only in the result clause.
4. Fresh snow can hide deep cracks in the ice. If the guide sees a dangerous crack, the whole group _____ (change) direction together.
Respuesta: will change

First Conditional: Combining Two Ideas

1. It rains tomorrow. We will cancel the picnic.
Respuesta: If it rains tomorrow, we will cancel the picnic., If it rains tomorrow, we will cancel the picnic
Turn the first idea into the if-clause with present simple, then add will to the result.
2. She misses the deadline. Her manager will not be pleased.
Respuesta: If she misses the deadline, her manager will not be pleased., If she misses the deadline, her manager will not be pleased
Misses stays present simple in the if-clause; will not be pleased is the negative result.
3. You do not book early. The tickets will sell out.
Respuesta: If you do not book early, the tickets will sell out., If you do not book early, the tickets will sell out
Keep the negative present simple, do not book, in the if-clause before adding will sell out.
4. The team trains hard this week. They will win the match.
Respuesta: If the team trains hard this week, they will win the match., If the team trains hard this week, they will win the match
Trains stays present simple for the condition, and will win names the likely result.
5. He does not apologise. She will not speak to him.

First Conditional – Ejercicios de Gramática Inglés B1 con Soluciones

If she ___ the bus, she will be late for work.

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Preguntas y respuestas de práctica

First Conditional: Real Future Possibilities

Word Order: Where Will Belongs

Common First Conditional Mistakes

First Conditional in Context: Mountain Safety Rules

First Conditional: Combining Two Ideas

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