Наречия, считается, заканчиваются в английском на -ly, но только есть немало наречий без этого окончания. И, наоборот, прилагательное с ним. А есть такие, что одновременно являются и прилагательным, и наречием.
Эти четыре стиха, практически мини-рэп-опера, поможет вам разобраться в этом.
Adverbs which don’t end with -ly
Very, too, almost, so, pretty, outside
Also, enough, rather, quite, now, inside
Home, underground, near, abroad, far, upstairs,
Tomorrow, today, yesterday, last, downstairs
Hard, fast, late, high, always, often, though, ever
Seldom, sometimes, here, there, nowhere and never
Later, well, fine, anywhere, everywhere
Soon, little, less, much, more, least, most, somewhere.
Just ,low, yet, even, like, once, twice tonight,
Nevertheless, anyway, way, wrong, right
Next, and aside, around, better and then
Forward, however, ago, back, again
Adjectives which end with -ly
Early, hourly, daily, weekly, monthly, yearly, jolly
Friendly, lovely, lonely, lively, likely, silly, holy.
Ugly, chilly, deadly, costly, heavenly, sly, curly
Woolly, cowardly, unlikely, elderly and surly
Homely, orderly and oily, bubbly, manly, hilly
Ghostly, southerly and sparkly, womanly and frilly.
Crumbly, grisly, melancholy, smelly, timely, prickly
Wobbly, kindly, measly, wriggly, comely, stately, sickly.
Words which are both adverbs and adjectives
Early, late, near, far, high, low, daily, fine and well,
They are adverbs as you know, but adjectives as well
“Early” and “lately”
“Hardly” and “easy”
“Highly” and “low”
“Nearly” and “far”.
These pairs of words
Are not opposite, really,
Well, even though they just look like they are.
“Lately” means “recently”,
“Highly” means “super”,
“Nearly” means “almost”,
“Hardly” means “nil”,
Well, almost zero, just like "hardly ever".
You know this rule now and you always will.