What do AAVE (African American Vernacular English, ASL (American Sign Language), and Nahuatl all have in common?

Well, it’s what they lack. A copula for the present tense.

A copula is a word that links subject to predicate, like the various forms of the verb “be” in English.

Zero copula languages (which also include Arabic and Russian, among others) don’t say, for example, “you’re beautiful.” Instead, they say something along the lines of “you beautiful” (which, indeed, is perfectly lovely AAVE).