If/ɪf/ Definition 1 of 5Pro Tip 1/3Conditional Outcome Shows consequence or outcome that depends on whether the first part happens. If you study hard, you'll pass the exam. Pro Tip 2/3Choice Indication Used when indicating choices or alternatives available. If you prefer tea, we also have green and black. Pro Tip 3/3Real vs. Unreal Distinguishes real situations from hypothetical ones, with different verb forms used. If he is there, say hello. If he were there, you would see him.