The word(s) "why" appears 77 time(s) in 72 verse(s) in Quran in Abdullah Yusuf Ali translation.

(31) They said: "O our father! why dost thou not trust us with Joseph,- seeing we are indeed his sincere well-wishers?

(32) And the Unbelievers say: "why is not a sign sent down to him from his Lord?" But thou art truly a warner, and to every people a guide.

(33) The Unbelievers say: "why is not a sign sent down to him from his Lord?" Say: "Truly Allah leaveth, to stray, whom He will; But He guideth to Himself those who turn to Him in penitence,-

(34) "No reason have we why we should not put our trust on Allah. Indeed He Has guided us to the Ways we (follow). We shall certainly bear with patience all the hurt you may cause us. For those who put their trust should put their trust on Allah."

(35) "why bringest thou not angels to us if it be that thou hast the Truth?"

(36) We know best why it is they listen, when they listen to thee; and when they meet in private conference, behold, the wicked say, "Ye follow none other than a man bewitched!"

(37) "These our people have taken for worship gods other than Him: why do they not bring forward an authority clear (and convincing) for what they do? Who doth more wrong than such as invent a falsehood against Allah?

(38) "why didst thou not, as thou wentest into thy garden, say: 'Allah's will (be done)! There is no power but with Allah!' If thou dost see me less than thee in wealth and sons,

(39) Behold, he said to his father: "O my father! why worship that which heareth not and seeth not, and can profit thee nothing?

(40) He will say: "O my Lord! why hast Thou raised me up blind, while I had sight (before)?"