Grammar, how to formulate sentences

The grammar of the ancient languages of the Indo-European requires an examination of the ways in which the motions they say were and could be written out.

The grammar they saw was the motion of nature. But they did not see the rising of the sun they saw the earth rotating around the sun. that perception requires an entirely different examination of language. Language itself is the way individuals communicate with individuals communicate with each other. The language they used was a language resulting from an application of communicating about motion.

Describing how things move. What is in motion.

That is the rules of grammar; the rules of how things move.