Conditionals
Master conditionals in English. Learn how to express hypothetical situations and real versus impossible possibilities with if, unless, and provided that.
What Are Conditionals?
Conditionals are grammatical structures that express hypothetical situations, possibilities, and their outcomes. They consist of a conditional clause (if) and a main clause that expresses the result.
📋 Quick Reference
Zero Conditional
Used for general facts, universal truths, and situations that always hold true.
| Structure | Example | Meaning |
|---|---|---|
| If + present simple, present simple | If you heat water, it boils | If you heat water, it boils |
| Present simple + if + present simple | Water boils if you heat it | Water boils if you heat it |
| When/whenever + present simple, present simple | When it rains, the ground gets wet | When it rains, the ground gets wet |
Si no comes, tienes hambre
If you don't eat, you get hungry
If you don't eat, you get hungry
Cuando hace frío, uso abrigo
When it's cold, I wear a coat
When it's cold, I wear a coat
Si estudias, aprendes
If you study, you learn
If you study, you learn
Uses of the Zero Conditional
It is used for:
- Scientific and natural facts
- Routines and habits
- Instructions and rules
- General cause and effect
First Conditional
Used for real, possible situations in the future. It expresses conditions that may be fulfilled.
| Structure | Example | Meaning |
|---|---|---|
| If + present simple, will + infinitive | If it rains, I will stay home | If it rains, I’ll stay home |
| If + present simple, be going to + infinitive | If you study, you are going to pass | If you study, you’re going to pass |
| If + present simple, modal + infinitive | If you hurry, you can catch the bus | If you hurry, you can catch the bus |
Si tengo tiempo, te llamaré
If I have time, I will call you
If I have time, I will call you
Si estudias mucho, aprobarás
If you study hard, you will pass
If you study hard, you’ll pass
Si viene temprano, podremos almorzar juntos
If he comes early, we can have lunch together
If he comes early, we can have lunch together
Features of the First Conditional
Key points:
- Possible, real condition
- Likely result in the future
- Can use will, be going to, or modals
- Expresses realistic plans and predictions
Second Conditional
Used for hypothetical, unreal, or unlikely situations in the present or future.
| Structure | Example | Meaning |
|---|---|---|
| If + past simple, would + infinitive | If I won the lottery, I would travel | If I won the lottery, I would travel |
| If + past simple, could + infinitive | If I had time, I could help you | If I had time, I could help you |
| If + past simple, might + infinitive | If it rained, we might stay inside | If it rained, we might stay inside |
Si fuera rico, compraría una casa grande
If I were rich, I would buy a big house
If I were rich, I would buy a big house
Si tuviera alas, podría volar
If I had wings, I could fly
If I had wings, I could fly
Si fuera más joven, haría más deporte
If I were younger, I would do more sport
If I were younger, I would do more exercise
Uses of the Second Conditional
It is used for:
- Unreal hypothetical situations
- Dreams and fantasies
- Indirect advice
- Unlikely situations
Third Conditional
Used for hypothetical situations in the past that cannot be changed. It expresses regret or speculation about the past.
| Structure | Example | Meaning |
|---|---|---|
| If + past perfect, would have + past participle | If I had studied, I would have passed | If I had studied, I would have passed |
| If + past perfect, could have + past participle | If you had called, I could have helped | If you had called, I could have helped |
| If + past perfect, might have + past participle | If it had rained, we might have stayed | If it had rained, we might have stayed |
Si hubiera sabido, habría venido antes
If I had known, I would have come earlier
If I had known, I would have come earlier
Si no hubiera llovido, habríamos ido al parque
If it hadn't rained, we would have gone to the park
If it hadn’t rained, we would have gone to the park
Si hubiera tenido dinero, habría comprado el coche
If I had had money, I would have bought the car
If I had had money, I would have bought the car
Features of the Third Conditional
Key points:
- Past situation that did not happen
- Result also in the past
- Expresses regret or speculation
- The outcome cannot be changed
Mixed Conditionals
They combine different tenses when the condition and the result lie at different points in time.
| Type | Structure | Example |
|---|---|---|
| Type 1 | If + past perfect, would + infinitive | If I had studied, I would be smarter now |
| Type 2 | If + past simple, would have + past participle | If I were taller, I would have played basketball |
| Type 3 | If + present perfect, would + infinitive | If I have finished, I will leave early |
Si hubiera estudiado medicina, sería doctor ahora
If I had studied medicine, I would be a doctor now
If I had studied medicine, I would be a doctor now
Si fuera más valiente, habría viajado solo
If I were braver, I would have traveled alone
If I were braver, I would have traveled alone
Si tengo tiempo mañana, habré terminado el proyecto
If I have time tomorrow, I will have finished the project
If I have time tomorrow, I’ll have finished the project
Uses of Mixed Conditionals
They are used to:
- Link the past with the present
- Link the present with the past
- Express complex results
- Show relationships across time
Unless, Provided that, As long as
Other words can introduce conditions with more specific meanings.
| Word | Meaning | Example |
|---|---|---|
| unless | except if / if … not | Unless you study, you won't pass |
| provided that | provided that / as long as | I'll help provided that you ask nicely |
| as long as | as long as / while | As long as you're happy, I'm happy |
| in case | in case / just in case | Take an umbrella in case it rains |
| suppose/supposing | suppose / let’s suppose | Supposing it rains, what will we do? |
No aprobarás a menos que estudies
You won't pass unless you study
You won’t pass unless you study
Te ayudaré siempre que me lo pidas bien
I'll help you provided that you ask nicely
I'll help you as long as you ask nicely
Lleva paraguas por si llueve
Take an umbrella in case it rains
Take an umbrella in case it rains
Important Differences
Pick the right word:
- Unless = if not (negative)
- Provided that = a specific condition
- As long as = ongoing condition
- In case = precaution
Common Mistakes
Correct: Use consistent tenses ✅
If I will have time, I would help. → If I have time, I will help.
Correct: Use ‘were’ for every person ✅
If I was rich... → If I were rich...
Correct: Include ‘have’ in the result ✅
If I had known, I would come. → If I had known, I would have come.
Correct: ‘Unless’ already conveys negation ✅
Unless you don't study... → Unless you study...
Correct: Understand the difference in likelihood ✅
If water boils (Zero) vs If it rains (First)
Key Rules
1. Verb tenses
Each conditional type uses specific tenses.
- Zero: present + present
- First: present + future
- Second: past + would + infinitive
- Third: past perfect + would have + past participle
2. Probability
Conditionals express different degrees of likelihood.
- Zero: always true (100%)
- First: possible (50–90%)
- Second: unlikely (10–30%)
- Third: impossible (0%)
3. Flexible word order
You can change the order of the clauses.
- If clause + comma + main clause
- Main clause + if clause (no comma)
- Both orders are correct
- Choose based on emphasis