Descriptive grammar is an attempt to give an account of what the current system is for either a society or an individual, whatever you happen to be studying.
Noam ChomskyThe leading, the most respected Vietnam historian, military historian Bernard Fall -he was a hawk incidentally, but he cared for the Vietnamese - he said it wasn't clear to him whether Vietnam could survive as a historical and cultural entity under the most massive attack that any region that size had ever suffered. He was talking about South Vietnam, incidentally.
Noam Chomsky