The First and Second Conditional
I would earn a lot of money if I get that job. Unfortunately, they hired another candidate.
...if I got that job.
If I pass the test, I don't have to study at the weekend. Hope it'll be all right.
...I won't have to study at the weekend.
I'd help you if you are free on Saturday. I'm sorry you have to go out of town.
...if you were free on Saturday.