Adverbs of manner in English

The table below shows how we can make adverbs from adjectives in English.

Adjective Adverb
Add -ly to an adjective. This applies to adjectives ending in -l so that the l is doubled. But note: full/fully bad badly
careful carefully
mad madly
plain plainly
sudden suddenly
beautiful beautifully
musical musically
-y becomes -ily: consonant + y:
Compare: vowel + y
(day - noun)
busy busily
funny funnily
dry drily/dryly
sly slyly
Delete -e and add -ly for endings in -ie: noble nobly
able ably
nimble nimbly
possible possibly
whole wholy
Other adjectives ending in -e retain the -e when adding -ly: extreme extremely
tame tamely
Exceptions: due duly
true truly
Adjectives ending in -ic take -ally: fantastic fantastically
basic basically
systematic systematically
Exception: public publicly

Some adverbs have two forms which may have the same meaning:
I bought this car cheap/cheaply.

Some may have different meanings:
I work hard and play hard. He did hardly any work today.