¡Feliĉan ZamenhofTagon!

¡Happy ZamenhofDay!

Zamenhof did not realize how great his system of correlatives is. By using the am-suffix (Kiam, tiam, iam, neniam, kaj, ĉiam (when then, sometime, no-time, everytime)), I created a very specific adverb (ZamenhofTagam On ZamenhofDay). If he would have thought a little more about it, he would have realized that we do not need the definite article, if we would just use the suffix u (particular individual (kiu, tiu, iu, neniu, ĉiu (who, that-one, someone, no-one, everyone))). A cat would be kato, but the cat would be katu instead of la kato. Unfortunately, this use would now clash with imperative verbs.

Speaking about that-one, ¿what is with nonbinaries using they for singular. English has the singular pronouns that-one and this-one. One could say, "That-one is Mar.". They is for plurals.