Intermediate grammar exercise: first conditional sentences

English grammar practice exercise, for pre-intermediate and intermediate level.

In this exercise you will practise first conditional sentences.

Exercise instructions

Put the word in brackets into the correct form to complete these first conditional sentences:

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Structure of the first conditional
positive negative question
If you hurry, you'll catch the bus.

If you walk slowly, you won't catch the bus.

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

What will you do if the train is full tomorrow?
you'll = you will won't = will not
don't = do not
what you will
The first conditional – common mistakes
Common mistakes Correct version Why?
if you will go If you go to England, you will improve your English. We use the present simple in the if-clause.
if I will see him I'll tell him if I see him. We use the present simple in the if-clause.
I call him If I find his number, I will call him. We use will in the main clause, to express certainty in the future.