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

(271) They said: Swear to each other by Allah that we will certainly make a sudden attack on him and his family by night, then we will say to his heir: We did not witness the destruction of his family, and we are most surely truthful.

(272) And those who disbelieve say: What! when we have become dust and our fathers (too), shall we certainly be brought forth?

(273) We have certainly been promised this, we and our fathers before; these are naught but stories of the ancients

(274) And certainly We gave Musa the Book after We had destroyed the former generations, clear arguments for men and a guidance and a mercy, that they may be mindful.

(275) And certainly We have made the word to reach them so that they may be mindful.

(276) Surely Qaroun was of the people of Musa, but he rebelled against them, and We had given him of the treasures, so much so that his hoards of wealth would certainly weigh down a company of men possessed of great strength. When his people said to him: Do not exult, surely Allah does not love the exultant;

(277) And certainly We tried those before them, so Allah will certainly know those who are true and He will certainly know the liars.

(278) And (as for) those who believe and do good, We will most certainly do away with their evil deeds and We will most certainly reward them the best of what they did.

(279) And among men is he who says: We believe in Allah; but when he is persecuted in (the way of) Allah he thinks the persecution of men to be as the chastisement of Allah; and if there come assistance from your Lord, they would most certainly say: Surely we were with you. What! is not Allah the best knower of what is in the breasts of mankind.

(280) And most certainly Allah will know those who believe and most certainly He will know the hypocrites.