What are adverbs that modify adverbs?

Answer 1

An adverb can describe, or modify, another adverb. These are almost always adverbs of degree.

For example:

Jackie ran very quickly.

(Very modifies quickly.)

It was almost completely destroyed.

(Almost modifies completely which modifies destroyed)

These can sometimes "stack up" as in these examples:

He spoke entirely too loudly in the elevator.

The team did not play quite so badly in their final game.

(entirely and too, quite and so)