Mode
Position 4: Mode  (inflectional)
This position is the primary marker for perfect or imperfect mode (but it is not the only marker).
there are three morphemes in this position and indicate the structure of the perfective and imperfective
(see Structure if Imperfective and Perfective).

     ghe
     ne
     z

Modes
Part of the key to understanding the Dena'ina verb is understanding the concept of mode.
Mode is roughly analogous to the English concept of tense.  There are three modes in Dena'ina:

Imperfect:  In imperfect mode or the imperfective the action is incomplete.
Usually the imperfective is translated into English as present tense.
Technically, one would not say in Dena'ina "I walk." One would say "I am walking."
Perfect:  action complete. Perfect or perfective mode is usually translated into
English as past tense, as in 'I walked.'

Future/progressiveThe future or progressive mode is the same as the future tense in
          English.

The morphemes for mode are bound morphemes and are found in two places:
The verb stem contains variations that indicate mode (imperfect, perfect OR future/progressive),
in  prefix position 4 (see below).  Thus they are redundant.   

VERB STEM ASPECT
     Dena'ina verb stems fall into a number of general, abstract and semantic categories
each with its own set of stem morphemes for imperfect, perfect and future/progressive.
In addition each of these will vary according to whether it is an open (consonant/vowel)
or closed (consonant/vowel/consonant) type of stem.
The other characteristic of stem aspect is that prefix positions 3,4, and 5 will have certain
patterned morphemes signaling what the mode is: imperfect or perfect.

1. Momentaneous     Actions occurring at a single moment of time.
     Ø imperfective      paired with      z perfective
     z imperfective                                z perfective
     Ø imperfective                              gh perfective
     n imperfective                               n perfective
     Ø imperfective                              Ø perfective

2. Durative: Actions over a prolonged period of time.
     Ø imperfective
     gh perfective

3. Semelfactive: a single act out of a possible series.
     Ø imperfective
     z perfective*

4. Serative: discrete actions performed in a series
     Ø imperfective
     gh perfective

5. Repetitive: unanalyzable (to the Dena'ina) repeated actions (e.g. I'm dancing)
     Ø  imperfective
     ghe perfective

6. Stative: signifies the object is at rest in a particular place
     z imperfective
     gh perfective

7. Neuter: refers to adjective-like qualities such as color.
     gh imperfective
     gh perfective

8. Transitional: verbs expressing transition into a certain condition (e.g. becoming…)
     Ø imperfective
     Ø perfective

9. Progressive: motion which is continuous or non-directional
     gh perfective
     gh progressiv