Verb Theme

The verb theme carries the stem verb morpheme, which is immediately preceded by one of four classifiers (-h-, -Ø-, -l-, -d-).

The -Ø- classifier primarily marks intransitive and stative verbs.

The classifier -h-, referred to as ł classification in Athabaskan literature, marks transitivity and/or causativity and deletes when preceded by the first-person singular subject marking s-. Though it is found in some intransitive clauses, as in sehtsū́ts ("clothlike object is located"), these generally bear the -Ø- classifier.^[7]

• etsén segan 'the meat is dried'
• etsén sehgan 's/he dried the meat'

The -d- classifier serves a more complex function, accompanying self-benefactives, reflexives, reciprocals, iteratives (marked by the prefix ne-) and passives.

The -l- classifier combines the functions of the -d- and -h- (ł) classifiers.

Conjunct

The conjunct, which appears between the disjunct prefix group and the verb theme, carries inflectional information including subject, direct object and mood/aspect markings. In subject markings, Kaska syntactically differentiates between "subject I" and "subject II" morphemes (the latter represented in the gray boxes in the table below to the left).

Subject I markers occur conjunct-finally, while subject II markers occur conjunct-initially.

The direct object markings are given in the table at right. The marking for third-person singular direct object depends on the subject of the sentence: if the subject is in first- or second-person, then it is Ø-, but becomes ye- when the subject is in third-person.

Disjunct

The disjunct typically carries adverbial and derivational prefixes, including the negative marker dū- and the distributive plural morpheme né-, which pluralizes otherwise dual subjects and, in some cases, singular objects. The presence (or absence) of this feature bears most of the numerical marking that is not already indicated contextually or through the subject and object affixes themselves. The prefix ɬe- marks for dual subject in at least one verb phrase: "to sit." Postpositional morphemes, such as ts'i'- ("to") and yé- ("about"), also appear in the disjunct, along with the oblique object markings listed in the table below.

===Space, Time and Aspect===^[7] In Kaska, time is expressed primarily through aspect marking, called modes when described in Athabaskan languages. These prefixes convey imperfective, perfective and optative aspect. Overt expressions for quantified units of time exist, such as tādet'ē dzenḗs ("three days"), but rarely appear in Kaska dialog.

The imperfective (prefix Ø-) expresses incomplete action, is used in instrumental marking, descriptions of static situations and to express irrealis mood. In Kaska narratives, imperfective verb forms commonly accompany a humorous tone.

The perfective mode (prefix n-) functions largely in complement to the imperfective, expressing complete action, is used in descriptions of kinetic events and establishing realis mood. Kaska narratives tend to express a more serious tone through perfective verb forms.

The optative mode (prefix u- in conjunction with suffix -í) expresses unrealized or desired activity.

Directional prefixes, stems and suffixes also index spatial relations in Kaska narratives. These include allatives, ablatives, areals and punctuals, with some examples listed below.

• kúh- 'distant location (known to both speaker and addressee)'
• de- 'distant location (known exclusively to speaker)'
• ah- 'distant location (determined by non-focal character)'
• júh-, jah- 'nearby location'
• degé- 'up ahead' (also used to mean 'in the future')
• nā́né- 'across'
• -áné 'to the side' (often used in conjunction with ah- prefix)