What are the rules for forming the comparative and superlative degrees of adverbs?

The rules for forming the comparative and superlative degrees of adverbs are as follows:

1. For most adverbs, the comparative degree is formed by adding "-er" to the end of the adverb. For example:
- Adverb: fast
Comparative: faster

2. If the adverb ends in "-y," the "y" is changed to "i" before adding "-er" for the comparative degree. For example:
- Adverb: happy
Comparative: happier

3. If the adverb ends in "-ly," the comparative degree is formed by adding "more" before the adverb. For example:
- Adverb: slowly
Comparative: more slowly

4. Some adverbs have irregular comparative forms. These forms must be memorized as they do not follow a specific pattern. For example:
- Adverb: well
Comparative: better

The rules for forming the superlative degree of adverbs are similar to those for the comparative degree:

1. For most adverbs, the superlative degree is formed by adding "-est" to the end of the adverb. For example:
- Adverb: fast
Superlative: fastest

2. If the adverb ends in "-y," the "y" is changed to "i" before adding "-est" for the superlative degree. For example:
- Adverb: happy
Superlative: happiest

3. If the adverb ends in "-ly," the superlative degree is formed by adding "most" before the adverb. For example:
- Adverb: slowly
Superlative: most slowly

4. Some adverbs have irregular superlative forms. These forms must be memorized as they do not follow a specific pattern. For example:
- Adverb: well
Superlative: best

It is important to note that not all adverbs have comparative and superlative degrees. Some adverbs, such as "always" or "never," do not express degrees of comparison.