if

لَوْ \ had I (you, he etc.): if I (you, he, etc.) had: Had he asked me, I would have told him. if: (usu. in regard to the past) supposing that: If I had told you, you would not have believed me, (in regard to sth. impossible or improbable in the present or future; sometimes using the special forms were and were to of the verb to be) supposing that If I were you (but this is impossible), I should buy it.