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

(391) Allah has written down: I will most certainly prevail, I and My apostles; surely Allah is Strong, Mighty.

(392) And had it not been that Allah had decreed for them the exile, He would certainly have punished them in this world, and in the hereafter they shall have chastisement of the fire.

(393) Have you not seen those who have become hypocrites? They say to those of their brethren who disbelieve from among the followers of the Book: If you are driven forth, we shall certainly go forth with you, and we will never obey any one concerning you, and if you are fought against, we will certainly help you, and Allah bears witness that they are most surely liars.

(394) certainly if these are driven forth, they will not go forth with them, and if they are fought against, they will not help them, and even if they help-them, they will certainly turn (their) backs, then they shall not be helped.

(395) You are certainly greater in being feared in their hearts than Allah; that is because they are a people who do not understand

(396) Had We sent down this Quran on a mountain, you would certainly have seen it falling down, splitting asunder because of the fear of Allah, and We set forth these parables to men that they may reflect.

(397) Indeed, there is for you a good example in Ibrahim and those with him when they said to their people: Surely we are clear of you and of what you serve besides Allah; we declare ourselves to be clear of you, and enmity and hatred have appeared between us and you forever until you believe in Allah alone-- but not in what Ibrahim said to his father: I would certainly ask forgiveness for you, and I do not control for you aught from Allah-- Our Lord! on Thee do we rely, and to Thee do we turn, and to Thee is the eventual coming:

(398) certainly there is for you in them a good example, for him who fears Allah and the last day; and whoever turns back, then surely Allah is the Self-sufficient, the Praised.

(399) He it is Who raised among the inhabitants of Mecca an Apostle from among themselves, who recites to them His communications and purifies them, and teaches them the Book and the Wisdom, although they were before certainly in clear error,

(400) Those who disbelieve think that they shall never be raised. Say: Aye! by my Lord! you shall most certainly be raised, then you shall most certainly be informed of what you did; and that is easy to Allah.