The word(s) "why" appears 48 time(s) in 45 verse(s) in Quran in Muhammad Pickthal translation.

(31) And they say: why are not portents sent down upon him from his Lord? Say: Portents are with Allah only, and I am but a plain warner.

(32) And they say unto their skins: why testify ye against us? They say: Allah hath given us speech Who giveth speech to all things, and Who created you at the first, and unto Whom ye are returned.

(33) why, then, have armlets of gold not been set upon him, or angels sent along with him?

(34) Then why did those whom they had chosen for gods as a way of approach (unto Allah) not help them? Nay, but they did fail them utterly. And (all) that was their lie, and what they used to invent.

(35) And verily ye know the first creation. why, then, do ye not reflect?

(36) If We willed We verily could make it bitter. why then, give ye not thanks?

(37) why, then, when (the soul) cometh up to the throat (of the dying)

(38) why then, if ye are not in bondage (unto Us),

(39) Hast thou not observed those who were forbidden conspiracy and afterward returned to that which they had been forbidden, and (now) conspire together for crime and wrongdoing and disobedience toward the messenger? And when they come unto thee they greet thee with a greeting wherewith Allah greeteth thee not, and say within themselves: why should Allah punish us for what we say? Hell will suffice them; they will feel the heat thereof - a hapless journey's end!

(40) O ye who believe! why say ye that which ye do not?