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As is typical for many languages, full conditional sentences in English consist of a condition clause or protasis specifying a condition or hypothesis, and a consequence clause or apodosis specifying what follows from that condition. The condition clause is a dependent clause, most commonly headed by the conjunction if, while the consequence is contained in the main clause of the sentence. Either clause may appear first.
For more general information about the uses of verb tenses, moods and aspects in English, see Uses of English verb forms. Contradiction between the zero and first conditional.
Inversion in condition clauses below. The apodosis, expressing the consequence of the stated condition, is generally the main clause of the sentence. Depending on the sentence type, it may be a statement, question, or order. If I see him, I will tell him.