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

(91) And We will remove whatever of ill-feeling is in their breasts; the rivers shall flow beneath them and they shall say: All praise is due to Allah Who guided us to this, and we would not have found the way had it not been that Allah had guided us; certainly the apostles of our Lord brought the truth; and it shall be cried out to them that this is the garden of which you are made heirs for what you did.

(92) And certainly We have brought them a Book which We have made clear with knowledge, a guidance and a mercy for a people who believe.

(93) certainly We sent Nuh to his people, so he said: O my people! serve Allah, you have no god other than Him; surely I fear for you the chastisement of a grievous day.

(94) Then he turned away from them and said: O my people I did certainly deliver to you the message of my Lord, and I gave you good advice, but you do not love those who give good advice.

(95) The chiefs, those who were proud from among his people said: We will most certainly turn you out, O Shu'aib, and (also; those who believe with you, from our town, or you shall come back to our faith. He said: What! though we dislike (it)?

(96) So he turned away from them and said: O my people! certainly I delivered to you the messages of my Lord and I gave you good advice; how shall I then be sorry for an unbelieving people?

(97) And if the people of the towns had believed and guarded (against evil) We would certainly have opened up for them blessings from the heaven and the earth, but they rejected, so We overtook them for what they had earned.

(98) These towns-- We relate to you some of their stories, and certainly their apostles came to them with clear arguments, but they would not believe in what they rejected at first; thus does Allah set a seal over the hearts of the unbelievers

(99) And We did not find in most of them any (faithfulness to) covenant, and We found most of them to be certainly transgressors.

(100) He said: Yes, and you shall certainly be of those who are near (to me).