Conditionals: the first conditional

The form

If + Present Simple, + Will + Infinitive

Will + Infinitive + If + Present Simple (notice that there is no comma in this version)

Very often "if" replaced by words such as: when, until, before, as soon as, after.

After these words we always use Present Simple. Always!

Usage

To talk about real possibilities; something that can actually happen in the future.

Examples

If it rains, I won't go to the park.

If I study today, I'll go to the party tonight.

If I have enough money, I'll buy some new shoes.

She'll miss the bus if she doesn't leave soon.

If I see her, I'll tell her.

If he meets Tom, he'll shout at him.