14 verses have
when
in Edition Clear Qur'an by Talal Itani / Al-Anbiyaa (The Prophets)

21:12Then, when they sensed Our might, they started running away from it.

21:36When those who disbelieve see you, they treat you only with ridicule: “Is this the one who mentions your gods?” And they reject the mention of the Merciful.

21:38And they say, “When will this promise come true, if you are truthful?”

21:39If those who disbelieve only knew, when they cannot keep the fire off their faces and off their backs, and they will not be helped.

21:45Say, “I am warning you through inspiration.” But the deaf cannot hear the call when they are being warned.

21:46And when a breath of your Lord’s punishment touches them, they say, “Woe to us, we were truly wicked.”

21:52When he said to his father and his people, “What are these statues to which you are devoted?”

21:76And Noah, when he called before. So We answered him, and delivered him and his family from the great disaster.

21:78And David and Solomon, when they gave judgment in the case of the field, when some people’s sheep wandered therein by night; and We were witnesses to their judgment.

21:83And Job, when he cried out to his Lord: “Great harm has afflicted me, and you are the Most Merciful of the merciful.”

21:87And Jonah, when he stormed out in fury, thinking We had no power over him. But then He cried out in the darkness, “There is no god but You! Glory to You! I was one of the wrongdoers!”

21:89And Zechariah, when he called out to his Lord, “My Lord, do not leave me alone, even though you are the Best of heirs.”

21:96Until, when Gog and Magog are let loose, and they swarm down from every mound.

21:104On the Day when We fold the heaven, like the folding of a book. Just as We began the first creation, We will repeat it—a promise binding on Us. We will act.