The word(s) "certainly" appears 476 time(s) in 417 verse(s) in Quran in Muhammad Habib Shakir translation.

(81) Say: Then Allah's is the conclusive argument; so if He please, He would certainly guide you all.

(82) Or lest you should say: If the Book had been revealed to us, we would certainly have been better guided than they, so indeed there has come to you clear proof from your Lord, and guidance and mercy. Who then is more unjust than he who rejects Allah's communications and turns away from them? We will reward those who turn away from Our communications with an evil chastisement because they turned away.

(83) Most certainly then We will question those to whom (the apostles) were sent, and most certainly We will also question the apostles;

(84) Then most certainly We will relate to them with knowledge, and We were not absent.

(85) And certainly We have established you in the earth and made in it means of livelihood for you; little it is that you give thanks.

(86) And certainly We created you, then We fashioned you, then We said to the angels: Prostrate to Adam. So they did prostrate except Iblis; he was not of those who prostrated.

(87) He said: As Thou hast caused me to remain disappointed I will certainly lie in wait for them in Thy straight path.

(88) Then I will certainly come to them from before them and from behind them, and from their right-hand side and from their left-hand side; and Thou shalt not find most of them thankful.

(89) He said: Get out of this (state), despised, driven away; whoever of them will follow you, I will certainly fill hell with you all.

(90) They said: Our Lord! We have been unjust to ourselves, and if Thou forgive us not, and have (not) mercy on us, we shall certainly be of the losers.