有什麼英文字不用加''ly"?

Adverbs without the "ly":

Comparative adverbs: less, more, most, least
Superlative adverbs: higher, highest, lower, lowest, easier, easiest, etc

fast

very

rather

quite

almost

abreast

clockwise, anticlockwise

Here, there
pretty ( such as pretty good, Pretty is an adverb here)
easy ( It don't come easy)

2010-11-24 22:47:00 補充：
after, before

2010-11-24 22:47:58 補充：
Did you eat this before?

"fast" and "hard" are the two adjectives which I know.
However, "ly" can be added to "hard" in the following condition:
I hardly finish my homework. (= It is difficult for me to finish my homework.)

是指adverb不用加-ly嗎?

hard
e.g. work hard

fast
e.g. run fast

只想到這兩個, 其他有待補充.