The word(s) "certain" appears 498 time(s) in 437 verse(s) in Quran in Muhammad Habib Shakir translation.

(291) And certainly We sent Nuh to his people, so he remained among them a thousand years save fifty years. And the deluge overtook them, while they were unjust.

(292) He said: Surely in it is Lut. They said: We know well who is in it; we shall certainly deliver him and his followers, except his wife; she shall be of those who remain behind.

(293) And certainly We have left a clear sign of it for a people who understand.

(294) And (We destroyed) Qaroun and Firon and Haman; and certainly Musa came to them with clear arguments, but they behaved haughtily in the land; yet they could not outstrip (Us).

(295) Recite that which has been revealed to you of the Book and keep up prayer; surely prayer keeps (one) away from indecency and evil, and certainly the remembrance of Allah is the greatest, and Allah knows what you do.

(296) And they ask you to hasten on the chastisement; and had not a term been appointed, the chastisement would certainly have come to them; and most certainly it will come to them all of a sudden while they will not perceive.

(297) And (as for) those who believe and do good, We will certainly give them abode in the high places in gardens beneath which rivers flow, abiding therein; how good the reward of the workers:

(298) And if you ask them, Who created the heavens and the earth and made the sun and the moon subservient, they will certainly say, Allah. Whence are they then turned away?

(299) And if you ask them Who is it that sends down water from the clouds, then gives life to the earth with it after its death, they will certainly say, Allah. Say: All praise is due to Allah. Nay, most of them do not understand.

(300) And (as for) those who strive hard for Us, We will most certainly guide them in Our ways; and Allah is most surely with the doers of good.