1. Words used to modify a verb, an adjective, or another adverb
Adverbs
Words used to modify a verb, an adjective, or another adverb

2. Function of an adverb
When modifying adjectives or other adverbs, they add intensity or limit intensity of the word
Usually answers the following questions:
When?
Where?
How?
Why?
Under what conditions?
To what degree?

3. Examples of adverbs Pet the cat gently. [pet how? Gently]
Eat your vegetables first. [eat when? First]
Be extremely good while the babysitter is here. [extremely adds intensity to good; babysitter is where? Here]

4. Common Mistakes with adverbs
Not are never adverbs that are commonly overlooked
Well vs. good
Well is an adverb and should be used to modify a verb, adjective, or an adverb while good is an adjective
He ran well at the track meet today.
Well modifies the verb ran