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

(141) And those who disbelieve say: "We believe not in this Qur'an nor in that which was before it." But if you could see when the Zalimun (polytheists and wrong-doers) will be made to stand before their Lord, how they will cast the (blaming) word one to another! Those who were deemed weak will say to those who were arrogant: "Had it not been for you, we should certainly have been believers!"

(142) "So now the Word of our Lord has been justified against us, that we shall certainly (have to) taste (the torment).

(143) certainly, that is how We deal with Al-Mujrimun (polytheists, sinners, disbelievers, criminals, the disobedient to Allah).

(144) "Had it not been for the Grace of my Lord, I would certainly have been among those brought forth (to Hell)."

(145) But they denied him [Iliyas (Elias)], so they will certainly be brought forth (to the punishment),

(146) "And you shall certainly know the truth of it after a while".

(147) And indeed it has been revealed to you (O Muhammad صلى الله عليه وسلم), as it was to those (Allah's Messengers) before you: "If you join others in worship with Allah, (then) surely (all) your deeds will be in vain, and you will certainly be among the losers."

(148) And Allah judges with truth, while those to whom they invoke besides Him, cannot judge anything. certainly, Allah! He is the All-Hearer, the All-Seer.

(149) But surely, We shall cause those who disbelieve to taste a severe torment, and certainly, We shall requite them the worst of what they used to do.

(150) Those who believe not therein seek to hasten it, while those who believe are fearful of it, and know that it is the very truth. Verily, those who dispute concerning the Hour are certainly in error far away.