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

(701) The Day when they will be pushed down by force to the Fire of Hell, with a horrible, forceful pushing.

(702) The Day when their plotting shall not avail them at all nor will they be helped (i.e. they will receive their torment in Hell).

(703) So wait patiently (O Muhammad صلى الله عليه وسلم) for the Decision of your Lord, for verily, you are under Our Eyes ; and glorify the Praises of your Lord when you get up from sleep.

(704) By the star when it goes down (or vanishes).

(705) when that covered the lote-tree which did cover it!

(706) Those who avoid great sins (See the Qur'an, Verses: 6:152,153) and Al-Fawahish (illegal sexual intercourse) except the small faults, - verily, your Lord is of Vast Forgiveness. He knows you well when He created you from the earth (Adam), and when you were fetuses in your mothers' wombs. So ascribe not purity to yourselves. He knows best him who fears Allah and keeps his duty to Him [i.e. those who are Al-Muttaqun (the pious. See V.2:2)].

(707) From Nutfah (drops of semen - male and female discharges) when it is emitted.

(708) Then when the heaven is rent asunder, and it becomes rosy or red like red-oil, or red hide - [See V.70:8]

(709) when the Event (i.e. the Day of Resurrection) befalls.

(710) when the earth will be shaken with a terrible shake.