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Voice changes to argument structure?



Hello to the list:

I have a question related to THE MONOGRAPH.

The Monograph explains that argument structure is case requirements plus required number of arguments.

"its valency (i.e. the number of basic arguments that it requires) and its case requirements (i.e. the semantic roles played by the basic arguments). When combined, the valency and case requirements of a verb are usually referred to as the argument structure of the verb."
Monograph: 2.0 Verbs

The Monograph explains that voice changes do not change argument structure and that a demoted or deleted argument is always implied.

"A grammatical voice change starts with a basic verb and rearranges the argument structure by increasing or reducing the topicality of one core argument relative to another, but without changing the basic meaning of the verb. In the process, an existing argument may be deleted. A deleted argument may be expressed obliquely (e.g. passive) or may not be expressable at all (e.g. middle). However, the role of the deleted argument is ALWAYS implied." 
Monograph: 2.7 Grammatical Voice

I am confused when the monograph says that the system of voice changes will change argument structure.

"In other words, we will allocate a single suffix for each voice. The resulting verbs will, of course, have a different argument structure."
Monograph: 2.7.1 Implementation of a Grammatical Voice System

Can anyone shed some light on this?

Thank you
FaqSphinx