The word(s) "shouldst" appears 18 time(s) in 18 verse(s) in Quran in Muhammad Pickthal translation.

(1) And the Jews will not be pleased with thee, nor will the Christians, till thou follow their creed. Say: Lo! the guidance of Allah (Himself) is Guidance. And if thou shouldst follow their desires after the knowledge which hath come unto thee, then wouldst thou have from Allah no protecting guardian nor helper.

(2) And even if thou broughtest unto those who have received the Scripture all kinds of portents, they would not follow thy qiblah, nor canst thou be a follower of their qiblah; nor are some of them followers of the qiblah of others. And if thou shouldst follow their desires after the knowledge which hath come unto thee, then surely wert thou of the evil-doers.

(3) The people of the Scripture ask of thee that thou shouldst cause an (actual) Book to descend upon them from heaven. They asked a greater thing of Moses aforetime, for they said: Show us Allah plainly. The storm of lightning seized them for their wickedness. Then (even) after that) they chose the calf (for worship) after clear proofs (of Allah's Sovereignty) had come unto them. And We forgave them that! And We bestowed on Moses evident authority.

(4) Lo! I would rather thou shouldst bear the punishment of the sin against me and thine own sin and become one of the owners of the fire. That is the reward of evil-doers.

(5) Repel not those who call upon their Lord at morn and evening, seeking His Countenance. Thou art not accountable for them in aught, nor are they accountable for thee in aught, that thou shouldst repel them and be of the wrong-doers.

(6) Nor unto those whom, when they came to thee (asking) that thou shouldst mount them, thou didst tell: I cannot find whereon to mount you. They turned back with eyes flowing with tears, for sorrow that they could not find the means to spend.

(7) Never stand (to pray) there. A place of worship which was found upon duty (to Allah) from the first day is more worthy that thou shouldst stand (to pray) therein, wherein are men who love to purify themselves. Allah loveth the purifiers.

(8) Thus have We revealed it, a decisive utterance in Arabic; and if thou shouldst follow their desires after that which hath come unto thee of knowledge, then truly wouldst thou have from Allah no protecting friend nor defender.

(9) And they indeed strove hard to beguile thee (Muhammad) away from that wherewith We have inspired thee, that thou shouldst invent other than it against Us; and then would they have accepted thee as a friend.

(10) We have not revealed unto thee (Muhammad) this Qur'an that thou shouldst be distressed,