'Relative clauses are either postnominal, or more commonly, appear in a noun phrase without any overt head noun. In the latter case, they can equally well be considered as noun phrases which happen to be headed by a nominalized verb. The nominalized verb is always clause final in the relative clause, and takes any case marking imposed by the independent clause. If the NP being modified by a relative clause is headed by an overt noun, both the head noun and the verb of the relative clause will then be case marked. This implies that a relative clause modifying an overt noun appears in an appositive structure'. (Morse & Maxwell 1999:151).