The word(s) "when" appears 926 time(s) in 834 verse(s) in Quran in Muhammad Habib Shakir translation.

(521) And when he came to it, a voice was uttered from the right side of the valley in the blessed spot of the bush, saying: O Musa! surely I am Allah, the Lord of the worlds.

(522) And saying: Cast down you staff. So when he saw it in motion as if it were a serpent, he turned back retreating, and did not return. O Musa! come forward and fear not; surely you are of those who are secure;

(523) So when Musa came to them with Our clear signs, they said: This is nothing but forged enchantment, and we never heard of it amongst our fathers of old.

(524) And you were not on the western side when We revealed to Musa the commandment, and you were not among the witnesses;

(525) And you were not on this side of the mountain when We called, but a mercy from your Lord that you may warn a people to whom no warner came before you, that they may be mindful.

(526) But (now) when the truth has come to them from Us, they say: Why is he not given the like of what was given to Musa? What! did they not disbelieve in what Musa was given before? They say: Two magicians backing up each other; and they say: Surely we are unbelievers in all.

(527) And when it is recited to them they say: We believe in it surely it is the truth from our Lord; surely we were submitters before this.

(528) And when they hear idle talk they turn aside from it and say: We shall have our deeds and you shall have your deeds; peace be on you, we do not desire the ignorant.

(529) And your Lord never destroyed the towns until He raised in their metropolis an apostle, reciting to them Our communications, and We never destroyed the towns except when their people were unjust.

(530) And on the day when He will call them and say: Where are those whom you deemed to be My associates?