shouldst in British English
(ʃʊdst ) or shouldest (ˈʃʊdɪst ) verb. archaic or dialect (used with the pronoun thou or its relative equivalent) a form of the past tense of shall.
What does the word should imply?
On the other hand, should “denotes a guideline or recommendation whenever noncompliance with the specification is permissible.” When used as an auxiliary verb, it expresses “a conditional or contingent act or state … or moral obligation” (5). ... (Recall also that the word should does imply moral obligation.)
What is mayest in English?
verb Archaic. 2nd person singular present indicative of may1.