The word(s) "certainly" appears 107 time(s) in 101 verse(s) in Quran in Abdullah Yusuf Ali translation.

(81) But We will certainly give the Unbelievers a taste of a severe Penalty, and We will requite them for the worst of their deeds.

(82) We certainly gave Moses the Book aforetime: but disputes arose therein. Had it not been for a Word that went forth before from thy Lord, (their differences) would have been settled between them: but they remained in suspicious disquieting doubt thereon.

(83) Just in the same way, whenever We sent a Warner before thee to any people, the wealthy ones among them said: "We found our fathers following a certain religion, and we will certainly follow in their footsteps."

(84) "(I worship) only Him Who made me, and He will certainly guide me."

(85) If thou ask them, who created them, they will certainly say, Allah: How then are they deluded away (from the Truth)?

(86) Therefore, when ye meet the Unbelievers (in fight), smite at their necks; At length, when ye have thoroughly subdued them, bind a bond firmly (on them): thereafter (is the time for) either generosity or ransom: Until the war lays down its burdens. Thus (are ye commanded): but if it had been Allah's Will, He could certainly have exacted retribution from them (Himself); but (He lets you fight) in order to test you, some with others. But those who are slain in the Way of Allah,- He will never let their deeds be lost.

(87) If the Unbelievers should fight you, they would certainly turn their backs; then would they find neither protector nor helper.

(88) They are the ones who denied Revelation and hindered you from the Sacred Mosque and the sacrificial animals, detained from reaching their place of sacrifice. Had there not been believing men and believing women whom ye did not know that ye were trampling down and on whose account a crime would have accrued to you without (your) knowledge, (Allah would have allowed you to force your way, but He held back your hands) that He may admit to His Mercy whom He will. If they had been apart, We should certainly have punished the Unbelievers among them with a grievous Punishment.

(89) And know that among you is Allah's Messenger: were he, in many matters, to follow your (wishes), ye would certainly fall into misfortune: But Allah has endeared the Faith to you, and has made it beautiful in your hearts, and He has made hateful to you Unbelief, wickedness, and rebellion: such indeed are those who walk in righteousness;-

(90) "All will certainly be gathered together for the meeting appointed for a Day well-known.