也 in classical Chinese as copula I've been doing my research on 者 and in one of the articles I read I came across a sentence from "Analects":


  安见方六七十如五六十而非邦也者。


Glosses for this example are as follows:


  where see size six-or-seventy or five-or-sixty and NEG country COP ZHE


I don't really understand why is 也 glossed as copula, is anyone able to explain why would it be treated as such instead of being a final particle? Is it because 者 is there too, probably also as a sentence final particle？
Because it is a coupla.


  Confucius rhetorically asks: "Among territories (方) which are 60 to
  70, or (如) 50 to 60 li, where can you see (安見) one (者) that isn't a
  state (非邦也)?"


方六七十如五六十而非邦也 specifies a territory (方) which is about 60 to 70, or 50 to 60 li that hypothetically may not be a state (非邦也; not be is the function of the coupla). The idea is that such territories do not exist, because you cannot pick out any one (者) among the set of territories of these measurements which isn't a state.