if /ˈɪf/
 (conj.)如果,是否,假設,即使條件DOS命令:測試並確定某特定條件真偽
 if
 若
 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.   --Pope.
    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.   --Dryden.
    She doubts if two and two make four.   --Prior.
 As if, But if. See under As, But.
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