Adverbs of Degree

Adverbs of degree tell how large, how small, how long, how much, to what extent etc. they answer the questions "How large?", "To what extent?". Adverbs of degree usually modify adjectives or other adverbs.

In the following illustrations the adverbs of degree modify adjectives:

This pear is very sour. (Very modifies the adjective sour)
The play was rather amazing. (Rather modifies amazing)

In the following sentences the adverbs of degree modify other adverbs:

Peter runs much faster than Edward. (Much modifies the adverb faster)
Don't talk so loud. (So modifies the adverb loud)