Big grammar theory
(Adjective clause)
I cannot believe that he said it. (Noun clause)
6. Adjectives and adverbs, word forming:
Adverbs formed from adjectives ending -ly:
1.) omadussõna lõpul olev -y, mille ees on konsonant, muutub i-ks:
· easy / easily
· funny / funnily
2.) -ll lõpulistel sõnadel langeb üks l välja:
· Full / fully
· Dull / dully
3.) -le lõpulistel omadussõnadel jääb -e ära:
· Possile / possibly
· Able / ably
· Simple / simply
Mõned -e lõpulised omadussõnad säilitavad -e:
· Wise / wisely
· Extreme / extremely
AGA! Scientific / scientifically; probable / probably...
But some words that end in -ly are adjectives, not adverbs and they cannot be used as adverbs:
Friendly; lovely; lonely; likely; silly.
He is friendly. He speaks in a friendly way. (NOT: He speaks friendly)