If means:in a possible or imagined situation
Uses
1.used for introducing a situation that may happen or may be real, especially when talking about its results
If we miss the last bus, we'll have to walk home.
2.used for introducing a situation or condition that must exist before something else happens
I'll come with you if you'll promise not to go too fast.
3.used for introducing a situation that does not exist now and is unlikely or impossible, especially when talking about its imaginary results
If you paid more attention in class, you would achieve better results.
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