There are four cases, and three of them affect pronouns: nominative case - the subject of the sentence accusative case - the direct object of the sentence genitive case - denotes possession and is ...

I give the man the book. Two nouns in a sentence - dative before accusative Ich gebe es dem Mann. I give it to the man. One noun, one pronoun in a sentence - pronoun goes first Ich gebe ihm das Buch.

Case theory deals with a special property that all noun phrases are assumed to have ... There are two Cases that are generally recognized in English--the nominative Case and the accusative Case--the ...

Presumably, the Case in formal English is [+Nom]. In colloquial Standard English, the Case is probably [-Nom], since the predicate object pronouns are accusative after BE: Note that the verb BE agrees ...