The word(s) "certain" appears 144 time(s) in 135 verse(s) in Quran in Abdullah Yusuf Ali translation.

(91) Say: "Who gives you sustenance, from the heavens and the earth?" Say: "It is Allah; and certain it is that either we or ye are on right guidance or in manifest error!"

(92) The Unbelievers say: "We shall neither believe in this scripture nor in (any) that (came) before it." Couldst thou but see when the wrong-doers will be made to stand before their Lord, throwing back the word (of blame) on one another! Those who had been despised will say to the arrogant ones: "Had it not been for you, we should certainly have been believers!"

(93) O men! certainly the promise of Allah is true. Let not then this present life deceive you, nor let the Chief Deceiver deceive you about Allah.

(94) The (people) said: "for us, we augur an evil omen from you: if ye desist not, we will certainly stone you. And a grievous punishment indeed will be inflicted on you by us."

(95) "Had it not been for the Grace of my Lord, I should certainly have been among those brought (there)!

(96) But they rejected him, and they will certainly be called up (for punishment),-

(97) He would certainly have remained inside the Fish till the Day of Resurrection.

(98) "We should certainly have been Servants of Allah, sincere (and devoted)!"

(99) That they would certainly be assisted,

(100) "That I will certainly fill Hell with thee and those that follow thee,- every one."