Syntax: The Case Filter 2.1
Since English is not considered a morphologically rich language, case is usually covertly marked, except in the case of pronouns and possession.
Each noun phrase in a sentence must be marked for case in order to show its grammatical function. If no case or the incorrect case is assigned to an NP, the sentence will be ungrammatical.
Ex: *Her bought a pink dress.
Here 'her' is marked with accusative case rather than nominal case, thus the sentence is ungrammatical.
Nominative case is assigned to a sentence’s subject by a finite ‘I’ head. Accusative case is assigned to a direct object by a ‘V’ head as well as the object of a preposition by ‘P’ head. Genitive case indicates possession and is assigned by the ‘N’ head.
This exercise will help you identify the three types of case assignment in English: nominative, accusative, and genitive. NPs are marked with these cases (and others, for a later discussion) mainly due to where they are located on a syntactic tree. This is referred to as structural case.
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