Conditionals in general
In general, conditionals are formed with two clauses: one clause with “if”; and the other clause with a variety of verb forms. We can use conditionals to express cause and effect, to talk about hypotheses, and to express probability or certainty. The choice of conditional depends entirely on you, the speaker, and how you perceive a particular situation. There are no fixed rules for when you have to use a conditional. It is important to remember this.