直接+ly
complete→completely
thorough→ thoroughly
part→partly

去y+ily
merry →merrily
shy →shily
healthy →healthily

去e+y
gentle →gently
terrible→ terribly
simple→ simply

变过去分词或ing形式后+ly
mistake →mistakenly
doubt→ doubtedly
increase→ increasingly
hurry →hurriedly
surprise surprisedly/surprisingly
excite→ excitedly
disappoint →disappointedly

不规则
whole →wholly
true →truly