The First Conditional. Forms

Conditional Sentences Type I (likely)

Condition refers to:	IF Clause		Main Clause
future action	Simple Present	If the book is interesting, …	Future I	…I will buy it.
			Imperative	…buy it.
			Modal Auxiliary	…you can buy it.
action going on now	Present Progressive	If he is snoring, …	Future I	…I will wake him up.
			Imperative	…wake him up.
			Modal Auxiliary	…you can wake him up.
finished action	Present Perfect	If he has moved into his new flat, …	Future I	…we will visit him.
			Imperative	…visit him.
			Modal Auxiliary	…we can visit him.
improbable action	should + Infinitive	If she should win this race, …	Future I	…I will congratulate her.
			Imperative	…congratulate her.
			Modal Auxiliary	…we can congratulate her.
present facts	Simple Present	If he gets what he wants, …	Simple Present	…he is very nice.

Exercise 1 

Exercise 2 

(source: ego4U)