Conditional Forms (Zero, First, Second, Third)

Conditionals are used to talk about real or unreal situations and their consequences. English has four main types: zero, first, second, and third conditionals — each with its own structure and use.

Zero Conditional (facts, general truths)

Structure: If + present simple, present simple

• If you heat water to 100°C, it boils.
• If I don't sleep well, I feel tired.

Use this to describe things that are always true — rules, laws of nature, routines.

First Conditional (real future possibilities)

Structure: If + present simple, will + base verb

• If it rains tomorrow, we will stay home.
• If I study, I will pass the test.

Use this for possible future events and their likely results.

Second Conditional (hypothetical or unlikely situations)

Structure: If + past simple, would + base verb

• If I won the lottery, I would travel the world.
• If she had more time, she would learn to play piano.

Use this for unreal or imagined situations in the present or future.

Third Conditional (imaginary past situations)

Structure: If + past perfect, would have + past participle

• If I had studied, I would have passed the exam.
• If they had left earlier, they wouldn’t have missed the train.

Use this for past situations that didn’t happen, and how things could have been different.