The word(s) "should" appears 389 time(s) in 321 verse(s) in Quran in Muhammad Habib Shakir translation.

(271) And should you ask them, Who created the heavens and the earth? They would most certainly say: Allah. Say: Have you then considered that what you call upon besides Allah, would they, if Allah desire to afflict me with harm, be the removers of His harm, or (would they), if Allah desire to show me mercy, be the withholders of His mercy? Say: Allah is sufficient for me; on Him do the reliant rely.

(272) Lest a soul should say: O woe to me! for what I fell short of my duty to Allah, and most surely I was of those who laughed to scorn;

(273) Or it should say: Had Allah guided me, I would certainly have been of those who guard (against evil);

(274) Or it should say when it sees the punishment: Were there only a returning for me, I should be of the doers of good.

(275) And warn them of the day that draws near, when hearts shall rise up to the throats, grieving inwardly; the unjust shall not have any compassionate friend nor any intercessor who should be obeyed.

(276) You call on me that I should disbelieve in Allah and associate with Him that of which I have no knowledge, and I call you to the Mighty, the most Forgiving;

(277) Say: I am forbidden to serve those whom you call upon besides Allah when clear arguments have come to me from my Lord, and I am commanded that I should submit to the Lord of the worlds.

(278) So be patient, surely the promise of Allah is true. So should We make you see part of what We threaten them with, or should We cause you to die, to Us shall they be returned.

(279) And certainly We sent apostles before you: there are some of them that We have mentioned to you and there are others whom We have not mentioned to you, and it was not meet for an apostle that he should bring a sign except with Allah's permission, but when the command of Allah came, judgment was given with truth, and those who treated (it) as a lie were lost.

(280) And you did not veil yourselves lest your ears and your eyes and your skins should bear witness against you, but you thought that Allah did not know most of what you did.