The word(s) "when" appears 1006 time(s) in 918 verse(s) in Quran in Muhammad Pickthal translation.

(231) And those who deny Our revelations - step by step We lead them on from whence they know not.

(232) They ask thee of the (destined) Hour, when will it come to port. Say: Knowledge thereof is with my Lord only. He alone will manifest it at its proper time. It is heavy in the heavens and the earth. It cometh not to you save unawares. They question thee as if thou couldst be well informed thereof. Say: Knowledge thereof is with Allah only, but most of mankind know not.

(233) He it is Who did create you from a single soul, and therefrom did make his mate that he might take rest in her. And when he covered her she bore a light burden, and she passed (unnoticed) with it, but when it became heavy they cried unto Allah, their Lord, saying: If thou givest unto us aright we shall be of the thankful.

(234) But when He gave unto them aright, they ascribed unto Him partners in respect of that which He had given them. High is He Exalted above all that they associate (with Him).

(235) Lo! those who ward off (evil), when a glamour from the devil troubleth them, they do but remember (Allah's Guidance) and behold them seers!

(236) And when thou bringest not a verse for them they say: Why hast thou not chosen it? Say: I follow only that which is inspired in me from my Lord. This (Qur'an) is insight from your Lord, and a guidance and a mercy for a people that believe.

(237) And when the Qur'an is recited, give ear to it and pay heed, that ye may obtain mercy.

(238) They only are the (true) believers whose hearts feel fear when Allah is mentioned, and when His revelations are recited unto them they increase their faith, and who trust in their Lord;

(239) And when Allah promised you one of the two bands (of the enemy) that it should be yours, and ye longed that other than the armed one might be yours. And Allah willed that He should cause the Truth to triumph by His words, and cut the root of the disbelievers;

(240) when ye sought help of your Lord and He answered you (saying): I will help you with a thousand of the angels, rank on rank.