If

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

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".

I wouldn't marry you if you were the last man on earth.

You're finishing your chowder if you sit there all afernoon!

“Wait a minute!” said the girl: “I wouldn’t hurry by, if it was you that was coming out to be hung, the next time eight o’clock struck, Bill. I’d walk round and round the place till I dropped, if the snow was on the ground, and I hadn’t a shawl to cover me.”

If it’s the last thing I do / If it takes me from Tubilo to Timbuktu / If it’s the last thing I do / I’m gonna dodge every road block, speed trap, county cop / To get my hands on you / If it’s the last thing I do.

The drain's blocked — and if the drain's blocked, the water won't flow.

O what of Gods then boots it to be borne, / If old Aveugles ſonnes ſo euill heare?

If you heat water to 100° C, it boils.

If it rains, it pours.

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.

Both Spear & Davis were indicted in the witchhunt surrounding the sensational (if nonexistent) "Revere sex ring."

I don't know if I want to go or not.

Quoth Matthew, “ […] / She doubts if two and two make four, / […] ”

It is doubtful if the Victorian Londoner needed any warning, for the artful mobsmen, toolers, whizzers and dippers, together with their stickman accomplices, were everywhere in the crowds, in the underground, on railway trains […]

I have leftover cake if you want some.

If you want to go home, I have the car keys.

The board can't approve this project; there are too many ifs.

1709, Susannah Centlivre, The Busy Body, Act III, in John Bell (ed.), British Theater, J. Bell (1791), page 59, Sir Fran. Nay, but Chargy, if——— ¶ Miran. Nay, Gardy, no Ifs.——Have I refus'd three northern lords, two British peers, and half a score knights, to have put in your Ifs?

Well might Bergman add, (in his Sciographia,), “if the compariſon that has been made, &c. be juſt.” The preſent writer makes no ifs about the matter, and has ſuperadded a little inaccuracy of his own, […]

Even if they managed to strike Japan, the United States or South Korea with nuclear weapons — a big if, given that they do not have a reliable delivery system — they could not save themselves from ultimate defeat.

The “Zarfian Cruelty Scale” rates games as Merciful, Polite, Tough, Nasty, or Cruel. The scale describes how works of IF become unwinnable, especially how and when the interactor (here a player, and one trying to win) learns this.