The word(s) "if" appears 1620 time(s) in 1267 verse(s) in Quran in Abdullah Yusuf Ali translation.

(291) "if Allah touch thee with affliction, none can remove it but He; if He touch thee with happiness, He hath power over all things.

(292) Of them there are some who (pretend to) listen to thee; but We have thrown veils on their hearts, So they understand it not, and deafness in their ears; if they saw every one of the signs, not they will believe in them; in so much that when they come to thee, they (but) dispute with thee; the Unbelievers say: "These are nothing but tales of the ancients."

(293) if thou couldst but see when they are confronted with the Fire! They will say: "Would that we were but sent back! Then would we not reject the signs of our Lord, but would be amongst those who believe!"

(294) Yea, in their own (eyes) will become manifest what before they concealed. But if they were returned, they would certainly relapse to the things they were forbidden, for they are indeed liars.

(295) And they (sometimes) say: "There is nothing except our life on this earth, and never shall we be raised up again."

(296) if thou couldst but see when they are confronted with their Lord! He will say: "Is not this the truth?" They will say: "Yea, by our Lord!" He will say: "Taste ye then the penalty, because ye rejected Faith."

(297) What is the life of this world but play and amusement? But best is the home in the hereafter, for those who are righteous. Will ye not then understand?

(298) if their spurning is hard on thy mind, yet if thou wert able to seek a tunnel in the ground or a ladder to the skies and bring them a sign,- (what good?). if it were Allah's will, He could gather them together unto true guidance: so be not thou amongst those who are swayed by ignorance (and impatience)!

(299) Say: "Think ye to yourselves, if there come upon you the wrath of Allah, or the Hour (that ye dread), would ye then call upon other than Allah?- (reply) if ye are truthful!

(300) "Nay,- On Him would ye call, and if it be His will, He would remove (the distress) which occasioned your call upon Him, and ye would forget (the false gods) which ye join with Him!"