The word(s) "certain" appears 184 time(s) in 178 verse(s) in Quran in Mohsin Khan translation.

(41) Say (O Muhammad صلى الله عليه وسلم): "I find not in that which has been revealed to me anything forbidden to be eaten by one who wishes to eat it, unless it be Maitah (a dead animal) or blood poured forth (by slaughtering or the like), or the flesh of swine (pork); for that surely is impure or impious (unlawful) meat (of an animal) which is slaughtered as a sacrifice for others than Allah (or has been slaughtered for idols, or on which Allah's Name has not been mentioned while slaughtering). But whosoever is forced by necessity without wilful disobedience, nor transgressing due limits; (for him) certainly, your Lord is Oft-Forgiving, Most Merciful."

(42) And it is He Who has made you generations coming after generations, replacing each other on the earth. And He has raised you in ranks, some above others that He may try you in that which He has bestowed on you. Surely your Lord is Swift in retribution, and certainly He is Oft-Forgiving, Most Merciful.

(43) They said: "Our Lord! We have wronged ourselves. If You forgive us not, and bestow not upon us Your Mercy, we shall certainly be of the losers."

(44) O Children of Adam! Take your adornment (by wearing your clean clothes), while praying and going round (the Tawaf of) the Ka'bah, and eat and drink but waste not by extravagance, certainly He (Allah) likes not Al-Musrifun (those who waste by extravagance).

(45) And between them will be a (barrier) screen and on Al-A'raf (a wall with elevated places) will be men (whose good and evil deeds would be equal in scale), who would recognise all (of the Paradise and Hell people), by their marks (the dwellers of Paradise by their white faces and the dwellers of Hell by their black faces), they will call out to the dwellers of Paradise, "Salamun 'Alaikum" (Peace be on you), and at that time they (men on Al-A'raf) will not yet have entered it (Paradise), but they will hope to enter (it) with certainty.

(46) certainly, We have brought them a Book (the Qur'an) which We have explained in detail with knowledge, - a guidance and a mercy to a people who believe.

(47) Indeed, We sent Nuh (Noah) to his people and he said: "O my people! Worship Allah! You have no other Ilah (God) but Him. (La ilaha illallah: none has the right to be worshipped but Allah). certainly, I fear for you the torment of a Great Day!"

(48) The chiefs of those who were arrogant among his people said: "We shall certainly drive you out, O Shu'aib, and those who have believed with you from our town, or else you (all) shall return to our religion." He said: "Even though we hate it!?"

(49) And if the people of the towns had believed and had the Taqwa (piety), certainly, We should have opened for them blessings from the heaven and the earth, but they belied (the Messengers). So We took them (with punishment) for what they used to earn (polytheism and crimes).

(50) And when they regretted and saw that they had gone astray, they (repented and) said: "If our Lord have not mercy upon us and forgive us, we shall certainly be of the losers."