The word(s) "should" appears 194 time(s) in 173 verse(s) in Quran in Mohsin Khan translation.

(141) And that you should worship Me [Alone - Islamic Monotheism, and set up not rivals, associate-gods with Me]. That is the Straight Path.

(142) Lest a person should say: "Alas, my grief that I was undutiful to Allah (i.e. I have not done what Allah has ordered me to do), and I was indeed among those who mocked [at the truth! i.e. La ilaha illallah (none has the right to be worshipped but Allah), the Qur'an, and Muhammad صلى الله عليه وسلم and at the faithful believers]

(143) Or (lest) he should say: "If only Allah had guided me, I should indeed have been among the Muttaqun (the pious - See V.2:2)."

(144) Or (lest) he should say when he sees the torment: "If only I had another chance (to return to the world), then I should indeed be among the Muhsinun (good-doers - See V.2:112)."

(145) "O my people! Yours is the kingdom today, you being dominant in the land. But who will save us from the Torment of Allah, should it befall us?" Fir'aun (Pharaoh) said: "I show you only that which I see (correct), and I guide you only to the path of right policy!"

(146) And, indeed We have sent Messengers before you (O Muhammad صلى الله عليه وسلم): of some of them We have related to you their story. And of some We have not related to you their story, and it was not given to any Messenger that he should bring a sign except by the Leave of Allah. But, when comes the Commandment of Allah, the matter will be decided with truth, and the followers of falsehood will then be lost.

(147) And you have not been hiding yourselves (in the world), lest your ears, and your eyes, and your skins should testify against you; but you thought that Allah knew not much of what you were doing.

(148) He (Allah) has ordained for you the same religion (Islamic Monotheism) which He ordained for Nuh (Noah), and that which We have revealed to you (O Muhammad صلى الله عليه و سلم), and that which We ordained for Ibrahim (Abraham), Musa (Moses) and 'Îsa (Jesus) saying you should establish religion (i.e. to do what it orders you to do practically), and make no divisions in it (religion) (i.e. various sects in religion). Intolerable for the Mushrikun, is that (Islamic Monotheism) to which you (O Muhammad صلى الله عليه و سلم) call them. Allah chooses for Himself whom He wills, and guides unto Himself who turns to Him in repentance and in obedience.

(149) It is not given to any human being that Allah should speak to him unless (it be) by Revelation, or from behind a veil, or (that) He sends a Messenger to reveal what He wills by His Leave. Verily, He is Most High, Most Wise.

(150) And they said: "If it had been the Will of the Most Gracious (Allah), we should not have worshipped them (false deities)." They have no knowledge whatsoever of that. They do nothing but lie!