The word(s) "could" appears 105 time(s) in 97 verse(s) in Quran in Abdullah Yusuf Ali translation.

(41) If thy Lord had so willed, He could have made mankind one people: but they will not cease to dispute.

(42) "And I follow the ways of my fathers,- Abraham, Isaac, and Jacob; and never could we attribute any partners whatever to Allah: that (comes) of the grace of Allah to us and to mankind: yet most men are not grateful.

(43) So he began (the search) with their baggage, before (he came to) the baggage of his brother: at length he brought it out of his brother's baggage. Thus did We plan for Joseph. He could not take his brother by the law of the king except that Allah willed it (so). We raise to degrees (of wisdom) whom We please: but over all endued with knowledge is one, the All-Knowing.

(44) "Turn ye back to your father, and say, 'O our father! behold! thy son committed theft! we bear witness only to what we know, and we could not well guard against the unseen!

(45) If there were a Qur'an with which mountains were moved, or the earth were cloven asunder, or the dead were made to speak, (this would be the one!) But, truly, the command is with Allah in all things! Do not the Believers know, that, had Allah (so) willed, He could have guided all mankind (to the right)? But the Unbelievers,- never will disaster cease to seize them for their (ill) deeds, or to settle close to their homes, until the promise of Allah come to pass, for, verily, Allah will not fail in His promise.

(46) And they carry your heavy loads to lands that ye could not (otherwise) reach except with souls distressed: for your Lord is indeed Most Kind, Most Merciful,

(47) And unto Allah leads straight the Way, but there are ways that turn aside: if Allah had willed, He could have guided all of you.

(48) If Allah so willed, He could make you all one people: But He leaves straying whom He pleases, and He guides whom He pleases: but ye shall certainly be called to account for all your actions.

(49) If it were Our Will, We could take away that which We have sent thee by inspiration: then wouldst thou find none to plead thy affair in that matter as against Us,-

(50) Say: "If the whole of mankind and Jinns were to gather together to produce the like of this Qur'an, they could not produce the like thereof, even if they backed up each other with help and support.