The superlative form of an adverb is used to say what thing or person does something to
the greater degree within a group or of its kind.
The rule for forming the superlative of an adverb is if it has the same form as an adjective add the suffix -est to the end.
For example:-
- fast - "Jill ran the fastest."
When an adverb ends in -ly, most is put in front of the adverb.
For example:-
- Frequently - "Jill did her homework most frequently."
The following irregular adverbs are exceptions:-
- 'well' becomes 'the best'
- 'badly' becomes 'the worst'
For example:
- "Jill did the best in the test."
- "Jack did the worst in the test."