Conditionals

Zero conditional

We use the zero conditional to talk about things that are always true.

• If you heat water, it boils.
• When the sun goes down, it gets dark.
• It lights up if you push that button.

The present simple is used in both clauses.

First conditional

We use the first conditional when we talk about real and possible situations.

• I’ll go shopping on the way home if I have time.
• If it’s a nice day tomorrow we’ll go to the beach.
• If Arsenal win they’ll be top of the league.

In first conditional sentences, the structure is usually if + present simple and will + infinitive. It’s not important which clause comes first.

Second conditional

The second conditional is used to talk about ‘unreal’ or impossible things.

• If I won a lot of money I’d buy a big house in the country.
• Where would you live if you could live anywhere in the world?
• If you didn’t smoke so much you’d feel a lot better.

The structure is usually if + past simple and would + infinitive. It’s not important which clause comes first.

Look at the difference between the first and second conditionals.

• In January: If it snows tomorrow I’ll go skiing. It might snow tomorrow.
• In August: If it snowed tomorrow I’d go skiing. It almost certainly won’t snow tomorrow.