The word(s) "when" appears 916 time(s) in 828 verse(s) in Quran in Mohsin Khan translation.

(391) when he called out his Lord (Allah) a call in secret.

(392) He said: "My Lord! How can I have a son, when my wife is barren, and I have reached the extreme old age."

(393) He said: "So (it will be). Your Lord says: It is easy for Me. Certainly I have created you before, when you had been nothing!"

(394) And mention in the Book (the Qur'an, O Muhammad صلى الله عليه وسلم the story of) Maryam (Mary), when she withdrew in seclusion from her family to a place facing east.

(395) She said: "How can I have a son, when no man has touched me, nor am I unchaste?"

(396) It befits not (the Majesty of) Allah that He should beget a son [this refers to the slander of Christians against Allah, by saying that 'Îsa (Jesus) is the son of Allah]. Glorified (and Exalted) be He (above all that they associate with Him). when He decrees a thing, He only says to it: "Be!" - and it is.

(397) Then the sects differed [i.e. the Christians about 'Îsa (Jesus) عليه السلام], so woe unto the disbelievers [those who gave false witness by saying that 'Îsa (Jesus) is the son of Allah] from the Meeting of a great Day (i.e. the Day of Resurrection, when they will be thrown in the blazing Fire) .

(398) How clearly will they (polytheists and disbelievers in the Oneness of Allah) see and hear the Day when they will appear before Us! But the Zalimun (polytheists and wrong-doers) today are in plain error.

(399) And warn them (O Muhammad صلى الله عليه وسلم) of the Day of grief and regrets, when the case has been decided, while (now) they are in a state of carelessness, and they believe not .

(400) when he said to his father: "O my father! Why do you worship that which hears not, sees not and cannot avail you in anything?