B1–B2 — Intermediate
Grammar
⏰ 10 min read
Difficulty: ●●●○○
What You Will Learn
- The four types of conditional sentences (Zero, 1st, 2nd, 3rd)
- When to use each type with clear real-life examples
- How to form each conditional correctly
- Mixed conditionals and common mistakes to avoid
Conditional sentences let us talk about situations and their results — things that are always true, things that might happen, things that are imaginary, and things in the past that did not happen. There are four main types.
π The Four Conditional Types
| Type | Real/Unreal | If Clause | Main Clause | Use |
| Zero | Always true | If + present simple | present simple | Facts & laws of nature |
| First | Real / possible | If + present simple | will + base verb | Future possibility |
| Second | Unreal / imaginary | If + past simple | would + base verb | Hypothetical present/future |
| Third | Unreal / past | If + past perfect | would have + past participle | Regrets / past impossibility |
① Zero Conditional — Always True
Use the Zero Conditional for scientific facts, habits, and things that are always true.
Structure: If + present simple, present simple.
Scientific Fact
If you heat ice, it melts.
Habit
If she drinks coffee after 8 PM, she can't sleep.
② First Conditional — Real Future Possibility
Use the First Conditional for realistic situations that might happen in the future.
Structure: If + present simple, will + base verb.
Possibility
If it rains tomorrow, we will cancel the trip.
Warning
If you don't study, you will fail the exam.
③ Second Conditional — Hypothetical / Unreal
Use the Second Conditional for imaginary situations or giving advice.
Structure: If + past simple, would + base verb.
Imaginary
If I had a million dollars, I would travel the world.
Advice
If I were you, I would apologise immediately.
π‘ Grammar Note
In the Second Conditional, use were for all persons: "If I were…", "If she were…", "If he were…" — not "was" (in formal English).
④ Third Conditional — Unreal Past
Use the Third Conditional to talk about the past — things that did NOT happen and their imaginary result.
Structure: If + past perfect, would have + past participle.
Regret
If she had studied harder, she would have passed the exam.
Missed Opportunity
If he had taken that job, he would have earned more money.
Ifunlessprovided thatas long aswouldwillmightcould
π Lesson Summary
- Zero: If + present, present → always true facts.
- First: If + present, will + verb → real future possibility.
- Second: If + past simple, would + verb → unreal/imaginary present.
- Third: If + past perfect, would have + past participle → unreal past.
- Use "were" (not "was") for all subjects in the Second Conditional.