The word(s) "when" appears 708 time(s) in 647 verse(s) in Quran in Abdullah Yusuf Ali translation.

(291) Then they proceeded: until, when they met a young man, he slew him. Moses said: "Hast thou slain an innocent person who had slain none? Truly a foul (unheard of) thing hast thou done!"

(292) Then they proceeded: until, when they came to the inhabitants of a town, they asked them for food, but they refused them hospitality. They found there a wall on the point of falling down, but he set it up straight. (Moses) said: "If thou hadst wished, surely thou couldst have exacted some recompense for it!"

(293) Until, when he reached the setting of the sun, he found it set in a spring of murky water: Near it he found a People: We said: "O Zul-qarnain! (thou hast authority,) either to punish them, or to treat them with kindness."

(294) Until, when he came to the rising of the sun, he found it rising on a people for whom We had provided no covering protection against the sun.

(295) Until, when he reached (a tract) between two mountains, he found, beneath them, a people who scarcely understood a word.

(296) "Bring me blocks of iron." At length, when he had filled up the space between the two steep mountain-sides, He said, "Blow (with your bellows)" Then, when he had made it (red) as fire, he said: "Bring me, that I may pour over it, molten lead."

(297) He said: "This is a mercy from my Lord: But when the promise of my Lord comes to pass, He will make it into dust; and the promise of my Lord is true."

(298) He said: "O my Lord! How shall I have a son, when my wife is barren and I have grown quite decrepit from old age?"

(299) He said: "So (it will be) thy Lord saith, 'that is easy for Me: I did indeed create thee before, when thou hadst been nothing!'"

(300) Relate in the Book (the story of) Mary, when she withdrew from her family to a place in the East.