First Conditional: Form

• The form is usually:

  If + present simple, will/won't + infinitive verb (future simple)

Future Possibility

If I have the time, I'll call you tonight.

Generally True

If you don't eat healthily, you won't feel good.

• Conditional sentences have two parts: the if clause and the main clause.

• The main clause describes the result of the situation in the if clause.

If + present simple, will/won't + infinitive verb (future simple)

If you're late, we'll go without you.

We'll go... = main clause = result

• When the if clause comes first, we use a comma (,) between the two clauses.

If you're late, we'll go without you.

• When a main clause comes before the if clause, we don't add a comma between the two clauses.

We'll go without you if you're late.