Three details on top of the basic pattern laid out earlier will help you handle the comings and goings of the /e/.
(a) The /e/ vowel actually comes up as /a/ when it’s followed by /q/. Otherwise the pattern is the same.
naqa’si I stop
→ ‘nqa’si stop!
→ ‘npa’sites I will stop
naqalg I leave h/her
→ ‘nqal leave h/her!
→ ‘nqalates I will leave h/her
maqtawe’g s/he/it is black
→ ‘mqatawapu “black-broth” = cormorant
(b) Because /o/ is generally originally from /a/—give or take some other details—a few words have the same pattern with /o/. The most common and useful of these is /poqt-/ ~ /’pqot/ ‘start, begin to…’.
poqtlugwei I start working
→ ‘pqotlugwa start working!
→ ‘pqotlugwetes I will start working
(c) Finally, a few words have a slightly quirky pattern between the e-form and the plain form. The most important of these is /wejgu-/ ~ /jugu-/ ‘coming this way/here’.
wejgu’ei I am coming (here)
→ jugu’a come (here)!
→ jugu’ates I will come (here)
wejgua’tu I am bringing it (here)
→ jugua’tu bring it (here)!
→ jugua’tutes I will bring it (here) (also said /juguattes/)