Maybe we need to define some new words and tenses for the paradox of existence?
First of all, there are things that exist in the eternal now, not the fleeting now. The past and future tense might not be appropriate for referring to something that exists eternally, but applying the present tense might also be inaccurate. Mathematics is one of these cases. This is the same problem noted in Existence as possibility: the everyday concept of time does not properly apply when describing the space of all possibilities.
Apart from the timeless/eternal existence, maybe the multitude/oneness antinomy can be represented more accurately? The oneness of the many, as for example is being referred to spiritual and philosophical traditions as “we all are one”, the unity of multiplicity. The “multi-one”.
It is and it is not could be better represented as a single word and/or verb?
Probably all antinomies fit here? Especially the ones that cannot be proved mathematically?
The verb “can” has at least two meanings: a) effortless potentiality, mathematical probability b) ability, change by effort, conditional
The verb “be”: a) is made of b) exists c) is part of