The word(s) "had" appears 413 time(s) in 356 verse(s) in Quran in Mohsin Khan translation.

(161) And if there had been a Qur'an with which mountains could be moved (from their places), or the earth could be cloven asunder, or the dead could be made to speak (it would not have been other than this Qur'an). But the decision of all things is certainly with Allah. Have not then those who believed yet known that had Allah willed, He could have guided all mankind? And a disaster will not cease to strike those who disbelieved because of their (evil) deeds or it (i.e. the disaster) settles close to their homes, until the Promise of Allah comes to pass. Certainly, Allah breaks not His Promise.

(162) The description of the Paradise which the Muttaqun (the pious - See V.2:2) have been promised: Underneath it rivers flow, its provision is eternal and so is its shade; this is the end (final destination) of the Muttaqun (the pious - See V.2:2), and the end (final destination) of the disbelievers is Fire. (See Verse 47:15)

(163) And they all shall appear before Allah (on the Day of Resurrection); then the weak will say to those who were arrogant (chiefs): "Verily, we were following you; can you avail us anything against Allah's Torment?" They will say: "had Allah guided us, we would have guided you. It makes no difference to us (now) whether we rage, or bear (these torments) with patience; there is no place of refuge for us."

(164) And Shaitan (Satan) will say when the matter has been decided: "Verily, Allah promised you a promise of truth. And I too promised you, but I betrayed you. I had no authority over you except that I called you, and you responded to me. So blame me not, but blame yourselves. I cannot help you, nor can you help me. I deny your former act in associating me (Satan) as a partner with Allah (by obeying me in the life of the world). Verily, there is a painful torment for the Zalimun (polytheists and wrong-doers)."

(165) And warn (O Muhammad صلى الله عليه و سلم) mankind of the Day when the torment will come unto them; then the wrong-doers will say: "Our Lord! Respite us for a little while, we will answer Your Call and follow the Messengers!" (It will be said): "had you not sworn aforetime that you would not leave (the world for the Hereafter).

(166) "And you dwelt in the dwellings of men who wronged themselves, and it was clear to you how We had dealt with them. And We put forth (many) parables for you."

(167) How much would those who disbelieved wish that they had been Muslims [those who have submitted themselves to Allah's Will in Islam i.e. Islamic Monotheism - this will be on the Day of Resurrection when they will see the disbelievers going to Hell and the Muslims going to Paradise].

(168) And indeed, We know the first generations of you who had passed away, and indeed, We know the present generations of you (mankind), and also those who will come afterwards.

(169) And We created not the heavens and the earth and all that is between them except with truth, and the Hour is surely coming, so overlook (O Muhammad صلى الله عليه و سلم) their faults with gracious forgiveness. [This was before the ordainment of Jihad - holy fighting in Allah's cause].

(170) And upon Allah is the responsibility to explain the Straight Path . But there are ways that turn aside (such as Paganism, Judaism and Christianity). And had He willed, He would have guided you all (mankind).