It is a theory of the Government and Binding framework and its successors. There are two Cases that are generally recognized in English--the nominative Case and the accusative Case--the latter is also ...

If dual-case prepositions describe movement from one place to another, they are followed by the accusative case. Otherwise, they take the dative. Ich stecke die Schuhe unter das Bett.

Ich gebe dem Mann das Buch. 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 ...