if

إِذا \ if: (usu. not followed by the future tense) on condition that; provided that: If you go, I shall go too, (usu. in regard to the past) supposing that: If he lost it, he was a fool. If I had told you, you would not have believed me, (in regard to sth. certain) when: Ice melts (or will melt) if you heat it. \ إِنْ \ if: (in regard to sth. certain) when: Ice melts (or will melt) if you heat it, (usu. not followed by the future tense) on condition that; provided that: If you go, I shall go too. \ فيما إذا \ if: whether: I asked him if you were at home.