This paper focuses on the capacity of the case markers in the Mongolian language, as a relative element, to generate any finite noun phrase or relative clause based on their syntactic function or relationship. In Mongolian, there are two different approaches to generate noun phrases: parataxis and hypotaxis. According to my early observation, if the noun phrase generated through the parataxis, is the complement of the postpositional phrase, the head word of the relevant noun phrase can be truncated. In other words, since this head noun is governed by case marker in its null form to generate the postpositional phrase, the head noun can be encoded. The second approach generates two different types of noun phrases in their structures: free structured and non-free structured noun phrases. Of them, the free structured noun phrase allows any syntactic transformations in their internal structure based on the senses of the case markers which denote a relation. That is to say, the null constituents in this type of noun phrases can be encoded to generate an extended alternative of the noun phrase and a relative clause.