verb (3rd sing. should)
Old English sceolde: past of shall
As with shall and will, there is confusion about when to use should and would. The traditional rule is that should is used with first person pronouns (I and we), as in I said I should be late, and would is used with second and third persons (you, he, she, it, they), as in you didn’t say you would be late. In practice, would is normally used instead of should in reported speech and conditional clauses: I said I would be late; if we had known we would have invited her. In spoken and informal contexts the issue rarely arises, since the distinction is obscured by the use of the contracted forms I’d, we’d, etc. In modern English uses of should are dominated by the senses relating to obligation (for which would cannot be substituted), as in you should go out more often, and for related emphatic uses, as in you should have seen her face! For a discussion on the use of should of instead of should have, see have (usage).