[tlhIngan Hol] A comic that illustrates the difference between past tense and the perfective

https://www.smbc-comics.com/comic/technical <https://www.smbc-comics.com/comic/technical> 11 was a prime number, and it has been a prime number, but it’s not done yet, being prime, so it’s being prime is not yet perfective. We’ll never be able to say that it had been prime. charghwI’ ‘utlh (ghaH, ghaH, -Daj)