Grammar · Sentence structure
Conditionals (if clauses)
Formula: 4 types: zero, first, second, third
B1
Quick answer
The 4 main uses
1. Zero conditional
If + Present Simple, Present Simple: something that is always true.
“If you heat water, it boils.”
2. First conditional
If + Present Simple, will + V: a real possibility in the future.
“If it rains, I will stay home.”
3. Second conditional
If + Past Simple, would + V: an imaginary situation now.
“If I had time, I would help you.”
4. Third conditional
If + Past Perfect, would have + past participle: an imaginary past, often a regret.
“If I had known, I would have come.”
Common mistakes to avoid
No will or would after if
A common mistake: If I will have time ✗ → If I have time, I will help ✓. The same for the second conditional: If I would have time ✗ → If I had time, I would help ✓.
If I were in the second conditional
With the verb be in the second conditional, the standard form is If I were, for all persons. If I was is common in speech, but it is not correct in formal grammar.
Third conditional: would have + past participle
A long structure, but you need it to express a regret: If I had studied, I would have passed. It is often shortened: I'd have passed.
Related pages: Conditionals (if clauses)
Pages on a similar topic or with a similar use, so you can keep exploring.
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Frequently asked questions
What are the 4 types of conditionals?+
Zero conditional (general truth): if + present, present. First conditional (real possibility): if + present, will + verb. Second conditional (imaginary present): if + Past Simple, would + verb. Third conditional (imaginary past): if + Past Perfect, would have + past participle.
What is the difference between the first and second conditional?+
First conditional = a real possibility in the future (If it rains tomorrow, I will stay home). Second conditional = an imaginary situation now (If I were rich, I would travel: but I am not rich).
Why is there no will after if?+
The rule: no future in the part that starts with if. English uses the present. If I have time (correct) → I will help. Not If I will have time.
Why do we say “if I were you”?+
In the second conditional with be, formal English uses were for all persons: If I were you, I would... In speech, if I was is more and more accepted, but If I were you is still the usual way to give advice.
How do you express regret in English?+
Use the third conditional: if + Past Perfect, would have + past participle. If I had studied harder, I would have passed (but I didn't study, so I didn't pass). It expresses a regret about the past.
Updated on 27 October 2026 by the Big Challenge teaching team. Every year, more than 500,000 students across Europe take part in our English contest, created in 1999. Our teaching approach →
The Big Challenge · Updated on 27 October 2026 · Source: www.thebigchallenge.com/bl/academy/learn-english/grammar/conditionals
© The Big Challenge. Copying allowed for classroom use. Every year, more than 500,000 students across Europe take part in our English contest, created in 1999.