The word(s) "certainly" appears 150 time(s) in 144 verse(s) in Quran in Mohsin Khan translation.

(101) Musa (Moses) said: "Then go away! And verily, your (punishment) in this life will be that you will say: "Touch me not (i.e. you will live alone exiled away from mankind); and verily (for a future torment), you have a promise that will not fail. And look at your ilah (god) to which you have been devoted. We will certainly burn it, and scatter its particles in the sea."

(102) And if We had destroyed them with a torment before this (i.e. Messenger Muhammad صلى الله عليه وسلم and the Qur'an), they would surely have said: "Our Lord! If only You had sent us a Messenger, we should certainly have followed Your Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), before we were humiliated and disgraced."

(103) They cried: "Woe to us! certainly we have been Zalimun (polytheists, wrong-doers and disbelievers in the Oneness of Allah)."

(104) certainly you (disbelievers) and that which you are worshipping now besides Allah, are (but) fuel for Hell! (Surely), you will enter it.

(105) And surely, the Hour is coming, there is no doubt about it; and certainly, Allah will resurrect those who are in the graves.

(106) He calls unto him whose harm is nearer than his profit: certainly, an evil Maula (patron) and certainly an evil friend!

(107) That He (Allah) may make what is thrown in by Shaitan (Satan) a trial for those in whose hearts is a disease (of hypocrisy and disbelief) and whose hearts are hardened. And certainly, the Zalimun (polytheists and wrong-doers) are in an opposition far-off (from the truth against Allah's Messenger and the believers).

(108) Invoke not loudly this day! certainly you shall not be helped by Us.

(109) And certainly, you (O Muhammad صلى الله عليه وسلم) call them to the Straight Path (true religion - Islamic Monotheism).

(110) Allah has promised those among you who believe and do righteous good deeds, that He will certainly grant them succession to (the present rulers) in the land, as He granted it to those before them, and that He will grant them the authority to practise their religion which He has chosen for them (i.e. Islam). And He will surely give them in exchange a safe security after their fear (provided) they (believers) worship Me and do not associate anything (in worship) with Me. But whoever disbelieves after this, they are the Fasiqun (rebellious, disobedient to Allah).