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

(101) And they assign a portion of that which We have provided them unto what they know not (false deities). By Allah, you shall certainly be questioned about (all) that you used to fabricate.

(102) He hides himself from the people because of the evil of that whereof he has been informed. Shall he keep her with dishonour or bury her in the earth ? certainly, evil is their decision.

(103) And be not like her who undoes the thread which she has spun, after it has become strong, by taking your oaths as a means of deception among yourselves, lest a nation should be more numerous than another nation. Allah only tests you by this [i.e who obeys Allah and fulfils Allah's Covenant and who disobeys Allah and breaks Allah's Covenant]. And on the Day of Resurrection, He will certainly make clear to you that wherein you used to differ [i.e. a believer confesses and believes in the Oneness of Allah and in the Prophethood of Prophet Muhammad صلى الله عليه و سلم which the disbeliever denies and that is their difference amongst them in the life of this world] .

(104) And had Allah willed, He could have made you (all) one nation, but He sends astray whom He wills and guides whom He wills. But you shall certainly be called to account for what you used to do.

(105) Whatever is with you, will be exhausted, and whatever is with Allah (of good deeds) will remain. And those who are patient, We will certainly pay them a reward in proportion to the best of what they used to do .

(106) Whoever works righteousness - whether male or female - while he (or she) is a true believer (of Islamic Monotheism) verily, to him We will give a good life (in this world with respect, contentment and lawful provision), and We shall pay them certainly a reward in proportion to the best of what they used to do (i.e. Paradise in the Hereafter).

(107) Say (O Muhammad صلى الله عليه و سلم to these polytheists, pagans): "If there had been other alihah (gods) along with Him as they assert, then they would certainly have sought out a way to the Lord of the Throne (seeking His Pleasures and to be near to Him).

(108) Verily, they were about to tempt you away from that which We have revealed (the Qur'an) unto you (O Muhammad صلى الله عليه و سلم), to fabricate something other than it against Us, and then they would certainly have taken you a Khalil (an intimate friend)!

(109) Say: "If there were on the earth, angels walking about in peace and security, We should certainly have sent down for them from the heaven an angel as a Messenger."

(110) And you would have thought them awake, whereas they were asleep. And We turned them on their right and on their left sides, and their dog stretching forth his two forelegs at the entrance [of the Cave or in the space near to the entrance of the Cave (as a guard at the gate)]. Had you looked at them, you would certainly have turned back from them in flight, and would certainly have been filled with awe of them.