should

Preterit of shall.

Used as an auxiliary verb, to express a conditional or contingent act or state, or as a supposition of an actual fact; also, to express moral obligation (see shall); e. g.: they should have come last week; if I should go; I should think you could go.

Used to form the future tense of the subjunctive mood, usually in the first person.

Be obliged to; have an obligation to; ought to; indicates that the subject of the sentence has some obligation to execute the sentence predicate.

Will likely (become or do something); indicates that the subject of the sentence is likely to execute the sentence predicate.

A variant of would.

A statement of what should be the case as opposed to what is the case.