Grammar Unit First Conditional

• In conditional sentences there are two clauses, an if clause and a result clause. We use the first conditional when it is possible or likely that the situation in the if clause will happen in the future.

          If I pass the test, my parents will be happy.

          If it doesn´t rain, we´ll go for a walk.

• The if clause is formed with if + subject + present simple. The result clause is formed with subject + will + base form of the verb. There is a comma after the if clause.

          If he sees Martina, he´ll tell her about the party.

          If we have time, we´ll do some shopping at the supermarket.

          If you don´t start your homework soon, you won´t finish it tonight.

• We can change the order of the two clauses. In this case, there is no comma between the clauses.

          He´ll tell Martina about the party if he sees her.

          We´ll do some shopping at the supermarket if we have time.

WHEN AND IF

• If indicate a possible situation. If we use when instead of if, it indicates that we are sure that the situation is going to happen.

          If he sees Martina, he´ll tell her about the party.

          When he sees Martina, he´ll tell her about the party.