The Copula at Its Potential Forms

As said earlier, the copula da is a fundamental particle which performs some of the functions usually performed by the verb to be and its forms, the link between the subject and its predicate.

So let us focus at the potential part, done by the form na which you can see below:

Tense/ Mode	No-past		Past		No-past (with emphasis on future)
	Affirm.	Neg.	Affirm.	Neg.	Affirm.	Neg.
Factual	da	mu / ne	deri	mu deri / ne deri	darah	mu darah / ne darah
Desiderative/ Potential	na	mu na/ ne na	neri	mu neri/ ne neri	narah	mu narah/ ne narah
Imperative	ba	mu ba/ ne ba	beri	mu beri/ ne beri	barah	mu barah/ ne barah

Due to the potential form embodied, the particle na and its variations (the na-branch particles) aren't meant for declarations or statements. Instead, they are for assumptions, kinda things starting with "if it was..." or "if it could be...".

§ Carly Simon da leonor, de on neri aktor.
 → Carly Simon is singer, but she would be an actress.

§ Kapkek na levniai, kol narah legurmezotjaror. [1]
 → Cupcake can be cheaper, just degourmetize it.

These na-branch particles may be used for putting verbs into desiderative/potential forms.

Well, that's it for now (:
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[1] lit. "just [it] should be degourmetized".