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

(211) And (remember) when Allah promised you (Muslims) one of the two parties (of the enemy i.e. either the army or the caravan) that it should be yours; you wished that the one not armed (the caravan) should be yours, but Allah willed to justify the truth by His Words and to cut off the roots of the disbelievers (i.e. in the battle of Badr).

(212) (Remember) when you sought help of your Lord and He answered you (saying): "I will help you with a thousand of the angels each behind the other (following one another) in succession."

(213) (Remember) when He covered you with a slumber as a security from Him, and He caused water (rain) to descend on you from the sky, to clean you thereby and to remove from you the Rijz (whispering, evil-suggestions) of Shaitan (Satan), and to strengthen your hearts, and make your feet firm thereby.

(214) (Remember) when your Lord revealed to the angels, "Verily, I am with you, so keep firm those who have believed. I will cast terror into the hearts of those who have disbelieved, so strike them over the necks, and smite over all their fingers and toes."

(215) O you who believe! when you meet those who disbelieve, in a battle-field, never turn your backs to them.

(216) You killed them not, but Allah killed them. And you (Muhammad صلى الله عليه وسلم) threw not when you did throw, but Allah threw, that He might test the believers by a fair trial from Him. Verily, Allah is All-Hearer, All-Knower.

(217) O you who believe! Answer Allah (by obeying Him) and (His) Messenger when he (صلى الله عليه وسلم) calls you to that which will give you life, and know that Allah comes in between a person and his heart (i.e. He prevents an evil person to decide anything). And verily to Him you shall (all) be gathered.

(218) And remember when you were few and were reckoned weak in the land, and were afraid that men might kidnap you, but He provided a safe place for you, strengthened you with His Help, and provided you with good things so that you might be grateful.

(219) And (remember) when the disbelievers plotted against you (O Muhammad صلى الله عليه وسلم) to imprison you, or to kill you, or to get you out (from your home, i.e. Makkah); they were plotting and Allah too was plotting; and Allah is the Best of those who plot.

(220) And when Our Verses (of the Qur'an) are recited to them, they say: "We have heard (the Qur'an); if we wish we can say the like of this. This is nothing but the tales of the ancients."