To make the first person singular (and plural) for imūstõ you must
1. Singular >add -b to imūstõ to make imūstõb (the reason why we’re not using the other First Person indicative -õb is because the verb already has õ) 2. Plural >add -m, but not -õm or -mõ because the same reason for the singular ma imūstõb õ'ldzõki'võd (i want gems)
Even doe Kashubian isn't really dead, but I remember when I was in some Kashubian small city everything was written in Polish. It's just like Welsh or Aquitanian now.