There is a designated external position for arguments of NP. This position precedes the Noun. Agents, themes and possessors can be externally realised in this prenominal position, that is, in front of the Noun Phrase (NP). It is the position in which possessive pronouns show up. For example, a possessor may be realised following the Noun in a PP headed by fon ‘of’, but it may also be realised in the designated genitival position preceding the Noun:

The term 'possessor' is in fact ambiguous. Semantically, it refers to the thematic role of possessor. Syntactically, it only refers to the prenominal designated position, external to the postnominal domain in which PPs are found. So, the complement of the preposition fon ‘of’ is semantically a possessor, but not syntactically, because it doesn’t occur in the prenominal possessor position. This syntactic possessor position is comparable to the subject position of a clause.

The choice of preposition correlates with the thematic role which is assigned to the prepositional complement. An adposition like uur is usually associated with themes. It never denotes the possessor. In contrast, the adposition fon ‘of’ has a wide array of uses. It can be used with Noun Phrases (NPs) bearing various thematic roles. It may denote a possessor, a theme or an agent. As a result, the following NP is three ways ambiguous:

The bracketed PP can denote the ones possessing the image, the ones who made the image, or the ones of whom the image is made. Such cases are rare, though. In contrast, the preposition an ‘to’ is mainly used for indirect objects and for locational contact. In the following example, this adposition is used for the thematic role characteristically present with indirect objects:

The PP used for the subject in the passive voice is either truch ‘by’ or fon ‘of’. This PP can also be used inside NPs to denote the agent associated with the noun. To illustrate, consider the example below:

Here Christ is presented as the author of peace (‘by’), though there is also the reading in which Christ is the way of peace (‘through’). The adposition truch ‘by’ is used for the subject in a passive clause as well:

Adpositions which are selected by the Noun may not appear in the prenominal position for external arguments:

So the last sentence is ungrammatical in the reading in which Arafat is the theme of teaching. If the theme can be expressed in a PP headed by the adposition fon ‘of’, then it is usually possible to have the theme in the prenominal position, as in the following example:

The prenominal argument position is reserved for persons. Furthermore, the prenominal argument is generally quite simple. It is not very well possible to expand the prenominal argument. Nouns can be elided following a possessor (see: possessive pronouns).