(helping verb) is (main verb) moving
A Main Verb is an action word or otherwise helps to make a statement.
Examples: runs, jumps, swims, fishes, flies, hops, eats, devours, consumes, inhales, is, are, seems.
Kyle devoured the pizza.
A Helping Verb helps the main verb fit into the sentence.
Example: has, been, is, have been.
Kyle has been eating all afternoon