This verb is used to convey that the subject is, or has the characteristics of, the preceding word or phrase (the "complement"). For example:
Toonai aant'ee. It's a fish. (lit. 'fish - it is thus')
Shoonkw' aasht'ee. I'm fine., I am well. (lit. 'fine/well - I am thus')
Teehkaatc'ee' t'eeh ch'aan aant'ee-yee. It eats crawfish raw, that's what it does., It actually eats crawfish raw. (lit. 'crawfish - raw - it eats - it is thus')
1: This is an unusual form; normally nin-perfective + first person singular becomes /nii-/.
2: After a vowel, nin-perfective + 2nd person singular may be pronounced either as /nin-/, or /n-/.
3: After a short vowel or glottal stop in impersonal forms, nin-perfective is sometimes pronounced fully (as /nin-/), sometimes reduced to /Vn-/ (where V is the preceding vowel).