Comparison of adverbs in English

The table below shows the way we create comparative and superlative forms of adverbs in English.

	Adverb	Comparative	Superlative
Same form as adjective:	fast	faster	fastest
-ly adverbs of manner	easily	more easily	most easily
	briefly	more/less briefly	most/least briefly
	clearly	more/less clearly	most/least clearly
	quickly	more/less quickly	most/least quickly
Some adverbs of frequency	rarely	more rarely	most rarely
	seldom	more seldom	most seldom
	often	more often oftener (less common)	most often -
Exceptions:	badly	worse	worst
	far	farther further	farthest further
	late	later	last
	little	less	least
	much	more	most
	well	better	best

Latest and last can be adjectives.
I have bought the latest CD of Coldplay. (i.e. most recent)
I bought the last CD of Whitney Huston. (i.e. final)

Normally only last is used as an adverb.
That was a difficult question, so I answered it last.
It last snowed six months ago. (= The last time it snowed was ...)

Farther and further can be both used to refer to distance.
He drove then miles farther/further than necessary.