comparison: comparative and superlative adverbs

Most comparative and superlative adverbs are made with more and most.

    Could you talk more quietly? (NOT. . . quietlier?)

A few adverbs have comparatives and superlatives with -erand -est. The most common are: fast, soon, early, late, hard, long, well {better, best), far (farther/further, farthest/furthest,), near; and in informal English slow, loud and quick.

    Can’t you drive any faster?
    Can you come earlier?
    She sings better than you do.
    Talk louder.