CHAPTER 6 VARIATION IN THE VERB SYSTEM 6-1] Introduction The verb system of Aymara consists of verb roots and verb suffixes, which together form verb stems. A verbalized noun root or stem is a verb theme. Verb roots, stems, and themes are usually cited with the nominalizing suffix -fia, unless the resulting form implies a seman- tically unacceptable human subject. (See 8-2.25 for more on -fia semantics.) The verb sa.fia ‘to say' (see 6-4) is set off from all others by its phonological structure (it is the only monosyllabic root in the lan- guage) and by its function as a syntactic subordinator. Most Aymara verbs have two-vowel roots; a few (mostly Spanish loans) have three-vowel roots. Spanish verbs enter Aymara freely, e. g. puyri.fia ‘to be able’ from Spanish poder. There is also a class of ambiguous noun/verb roots, as noted in 5-2.7. Verb suffixes are of two types: derivational and inflectional. Both types are closed classes that do not admit loans. Verbal derivational suffixes modify 317