The word(s) "why" appears 68 time(s) in 63 verse(s) in Quran in Mohsin Khan translation.

(51) "why then are not golden bracelets bestowed on him, or angels sent along with him?"

(52) Then why did those whom they had taken for alihah (gods) besides Allah, as a way of approach (to Allah) not help them? Nay, but they vanished completely from them (when there came the torment). And that was their lie, and their inventions which they had been inventing (before their destruction).

(53) Those who believe say: "why is not a Surah (chapter of the Qur'an) sent down (for us)? But when a decisive Surah (explaining and ordering things) is sent down, and fighting (Jihad - holy fighting in Allah's cause) is mentioned (i.e. ordained) therein, you will see those in whose hearts is a disease (of hypocrisy) looking at you with a look of one fainting to death. But it was better for them (hypocrites, to listen to Allah and to obey Him).

(54) We created you: then why do you believe not?

(55) And indeed, you have already known the first form of creation (i.e. the creation of Adam): why then do you not remember (or take heed)?

(56) If We willed, We verily could make it salt (and undrinkable): why then do you not give thanks (to Allah)?

(57) Then why do you not (intervene) when (the soul of a dying person) reaches the throat?

(58) Then why do you not - if you are exempt from the reckoning and recompense (punishment) -

(59) Have you not seen those who were forbidden to hold secret counsels, and afterwards returned to that which they had been forbidden, and conspired together for sin and wrong doing and disobedience to the Messenger (Muhammad صلى الله عليه وسلم). And when they come to you, they greet you with a greeting wherewith Allah greets you not, and say within themselves: "why should Allah punish us not for what we say?" Hell will be sufficient for them; they will burn therein. And worst indeed is that destination!

(60) O you who believe! why do you say that which you do not do?