
If
Conditional Outcome
Shows consequence or outcome that depends on whether the first part happens.

If you study hard, you'll pass the exam.
Choice Indication
Used when indicating choices or alternatives available.

If you prefer tea, we also have green and black.
Real vs. Unreal
Distinguishes real situations from hypothetical ones, with different verb forms used.

If he is there, say hello. If he were there, you would see him.
Compare with
AssumeConceivableGrantOnly ifProvideSupposeUnlessWhether
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