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

(351) And were it not that all people had been a single nation, We would certainly have assigned to those who disbelieve in the Beneficent Allah (to make) of silver the roofs of their houses and the stairs by which they ascend.

(352) Rather We will certainly show you that which We have promised them; for surely We are the possessors of full power over them.

(353) And certainly We sent Musa with Our communications to Firon and his chiefs, so he said: Surely I am the apostle of the Lord of the worlds.

(354) certainly We have brought you the truth, but most of you are averse to the truth.

(355) And if you should ask them who created them, they would certainly say: Allah. Whence are they then turned back?

(356) And certainly We tried before them the people of Firon, and there came to them a noble apostle,

(357) And certainly We delivered the children of Israel from the abasing chastisement,

(358) And certainly We chose them, having knowledge, above the nations.

(359) And certainly We gave the Book and the wisdom and the prophecy to the children of Israel, and We gave them of the goodly things, and We made them excel the nations.

(360) And certainly We had established them in what We have not established you in, and We had given-- them ears and eyes and hearts, but neither their ears, nor their eyes, nor their hearts availed them aught, since they denied the communications of Allah, and that which they mocked encompassed them.