When Amber and Igor were grunting all those nouns that named people, animals, and things, they also noticed that people did things: Animals moved around, made noises, and ate stuff; and tangible things could move and affect other things. They noticed activity. They perceived action. So they grunted some words to describe all the activity around them:
The baby crawled. The cow mooed. The wheel rolled. The fire blazed. The spear snagged the fish. John hit the ball. Action verbs were born.
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