Definitions
1.ConjunctionSupposing that, assuming that, in the circumstances that; used to introduce a condition that may be (or prove to be) either true or false."If crossing the road, make sure you look both ways.; If I give you the money would/will you buy it for me?; If you prefer, I can come tomorrow instead.; I'll, if I have time, do it next week.; I'll come only if you will do the driving.; Fetch me a cold beer if there's one in the fridge.; if A then B else C"
2.ConjunctionA keyword that invokes conditional processing: in the event that a given condition is true, execute the given statement(s) (otherwise execute other statements)."if A then B else C"
3.ConjunctionSupposing that; used with past or past perfect subjunctive to indicate a counterfactual or hypothetical condition."If she hadn't told me, I wouldn't know.; "You would be healthier if you would give up smoking" "Well, if I were rich, I'd go to one of those hypnosis therapies to quit".; She could have used my car if the battery wasn't flat.; I wouldn't marry you if you were the last man on earth.; You're finishing your chowder if you sit there all afernoon!"
4.ConjunctionEven if; even in the circumstances that."I wouldn't marry you if you were the last man on earth.; You're finishing your chowder if you sit there all afernoon!"
5.ConjunctionConsidering the fact that; given that; introducing a condition that is known to be true."The drain's blocked — and if the drain's blocked, the water won't flow."
6.ConjunctionWhen; whenever; every time that."If you heat water to 100° C, it boils.; If it rains, it pours."
7.ConjunctionAlthough; used to introduce a concession; may..but."He was a great friend, if a little stingy at the bar.; She won her team's admiration, if not the award, for her performance."
8.ConjunctionWhether; used to introduce a noun clause, an indirect question, that functions as the direct object of certain verbs."I don't know if I want to go or not."
9.ConjunctionIntroducing a relevance conditional; in case."I have leftover cake if you want some.; If you want to go home, I have the car keys."
10.ConjunctionWhile; used to introduce a contrast.
11.NounAn uncertainty, possibility, condition, doubt etc."The board can't approve this project; there are too many ifs."