The objective of this dissertation is to present a preliminary grammatical account of Asheninka Perene an endangered Arawak language of Southeastern Peru. The description and analysis of the language is based on the 29-week field research conducted in an area of the Southwest Amazonian high jungle. Interesting issues of Asheninka Perene grammar include a lack of phonemic voice distinction in stops, fricatives, and affricates, a series of palatalized stops, and a set of palatalized alveolar phonemes. Grammatical morphemes exhibit a great deal of multifunctionality. Possession is marked on the possessee or by juxtaposition. Non-masculine is the default gender. There is a small underived adjective class with mere thirteen members. The nominal classification system is fairly extensive. There is an array of highly productive applicative derivations. Aspectual and modal systems are very complex. Asheninka Perene shows a straightforward correspondence between unreal events and their encoding in the language as irrealis. Negated irrealis is expressed on the verb as realis. There is an abundance of clausal conjunctions. The language has a nominative-accusative system of grammatical alignment combined with the frequently occurring split intransitive phenomenon which is grammatically and pragmatically conditioned. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]