Conditionals - IF Clauses Conditional sentences have two parts: the if-clauseand the main clause. Example sentence: If it rains, I will cancel the trip. If it rains is the if-clause and I will cancel the trip is the main clause. The IF-clause introduces a condition. The main clause is the result of that condition. What happens in the main clause is conditional to what happens in the if-clause. In other words the main clause only happens when the events in the if-clause happen. There are 4 main