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

(431) So they twain journeyed on till, when they met a lad, he slew him. (Moses) said: What! Hast thou slain an innocent soul who hath slain no man? Verily thou hast done a horrid thing.

(432) So they twain journeyed on till, when they came unto the folk of a certain township, they asked its folk for food, but they refused to make them guests. And they found therein a wall upon the point of falling into ruin, and he repaired it. (Moses) said: If thou hadst wished, thou couldst have taken payment for it.

(433) Till, when he reached the setting-place of the sun, he found it setting in a muddy spring, and found a people thereabout. We said: O Dhu'l-Qarneyn! Either punish or show them kindness.

(434) Till, when he reached the rising-place of the sun, he found it rising on a people for whom We had appointed no shelter therefrom.

(435) Till, when he came between the two mountains, he found upon their hither side a folk that scarce could understand a saying.

(436) Give me pieces of iron - till, when he had levelled up (the gap) between the cliffs, he said: Blow! - till, when he had made it a fire, he said: Bring me molten copper to pour thereon.

(437) He said: This is a mercy from my Lord; but when the promise of my Lord cometh to pass, He will lay it low, for the promise of my Lord is true.

(438) when he cried unto his Lord a cry in secret,

(439) He said: My Lord! How can I have a son when my wife is barren and I have reached infirm old age?

(440) He said: So (it will be). Thy Lord saith: It is easy for Me, even as I created thee before, when thou wast naught.