conjunction Supposing that, assuming that, in the circumstances that; suppositive used to introduce a condition that may be (or prove to be) either true or false.
I'll do it next week if I have time.
conjunction A 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
conjunction Supposing 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.
conjunction Even if; even in the circumstances that.
I wouldn't marry you if you were the last man on earth.
conjunction Considering 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.
conjunction When; whenever; every time that.
If you heat water to 100° C, it boils.
conjunction Although; used to introduce a concession; may..but.
He was a great friend, if a little stingy at the bar.
conjunction While; used to introduce a contrast.
If tea is expensive, coffee is completely unaffordable.