The word(s) "if" appears 1640 time(s) in 1298 verse(s) in Quran in Mohsin Khan translation.

(511) "That which is left by Allah for you (after giving the rights of the people) is better for you, if you are believers. And I am not a guardian over you.

(512) He said: "O my people! Tell me if I have a clear evidence from my Lord and He has given me a good sustenance from Himself (shall I corrupt it by mixing it with the unlawfully earned money). I wish not, in contradiction to you, to do that which I forbid you. I only desire reform to the best of my power. And my guidance cannot come except from Allah, in Him I trust and unto Him I repent.

(513) "And ask forgiveness of your Lord and turn unto Him in repentance. Verily, my Lord is Most Merciful, Most Loving."

(514) As if they had never lived there! So away with Madyan (Midian) as away with Thamud! (All these nations were destroyed).

(515) And indeed We sent Musa (Moses) with Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) and a manifest authority.

(516) They were pursued by a curse in this (deceiving life of this world) and (so they will be pursued by a curse) on the Day of Resurrection. Evil indeed is the gift gifted [i.e. the curse (in this world) pursued by another curse (in the Hereafter)].

(517) And those who are blessed, they will be in Paradise, abiding therein for all the time that the heavens and the earth endure, except as your Lord wills: a gift without an end.

(518) Indeed, We gave the Book to Musa (Moses), but differences arose therein, and had it not been for a Word that had gone forth before from your Lord, the case would have been judged between them, and indeed they are in grave doubt concerning it (this Qur'an).

(519) if only there had been among the generations before you persons having wisdom, prohibiting (others) from Al-Fasad (disbelief, polytheism, and all kinds of crimes and sins) in the earth, (but there were none) - except a few of those whom We saved from among them! Those who did wrong pursued the enjoyment of good things of (this worldly) life, and were Mujrimun (criminals, disbelievers in Allah, polytheists, sinners).

(520) And if your Lord had so willed, He could surely have made mankind one Ummah [nation or community (following one religion i.e. Islam)] but they will not cease to disagree.