What is the dhatu roop of as?

The dhatu roop of "as" (to be) in Sanskrit primarily belongs to the root "अस" (as). Its various forms include "सति" (sati) for the present tense, "असति" (asati) for the past tense, and "स्यम" (syam) for the future tense. This root forms the basis for various grammatical constructions in Sanskrit, reflecting existence or being.