A conditional sentence is a sentence in a natural language that expresses that one thing is contingent on another, e.g., "If it rains, the picnic will be cancelled." They are so called because the impact of the sentence’s main clause is conditional on a subordinate clause. A full conditional thus contains two clauses: the subordinate clause, called the antecedent, which expresses the condition, and the main clause, called the consequent expressing the result.