If /(?)/

If

conj.
  1. In case that; granting, allowing, or supposing that; -- introducing a condition or supposition.
    Tisiphone, that oft hast heard my prayer, Assist, if Œdipus deserve thy care.
    If thou be the Son of God, command that these stones be made bread.
    — Matt. iv. 3.
  2. Whether; -- in dependent questions.
    Uncertain if by augury or chance.
    She doubts if two and two make four.

Phrases & Compounds
As if
See under As, But.