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If we miss the last bus, we'll have to walk home.
If anyone has found a bunch of keys, would they please leave them on my desk.
You can come and stay with us if you want.
Are you planning to return to work, and if so, who is going to look after the baby?
Has anyone dealt with the technical problems? And if not, why not?
We are ready to fight for our rights if necessary.
I should like to be back here by 10.30 if possible.
If Luke paid more attention in class, he would achieve better results.
If Freud were alive today, he would approve of our methods.
If you should happen to meet Diane, would you give her a message.
If anyone were to complain, I should merely tell them to write to the manager.
I'd never sell this painting, even if they offered me a million dollars.
If I'd known you were coming, I would have had a meal ready for you.
If the new safety system had been in use, the accident would never have happened.
This is the British English definition of if. View American English definition of if.