Study page - first conditional

If I see him, I'll (I will) tell him.     

If you don't hurry, you'll miss the bus.

What will you do if there is a problem?

If you go to England, you will improve your English.

We use present simple in the if-clause.

If I find his address, I will send him the letter.

The main clause has will, which expresses certainty in the future.

I'll tell him as soon as I see him.

We use present simple in the if-clause.