Adverbs of manner are used with verbs. They describe how something happens. Adverbs of manner can be in the middle or at the end of a sentence.
Adverbs of manner cannot be placed between verb and object.
Most adverbs of manner are formed by adding -ly to the adjective form.
However, some adverbs are spelled differently.
With adjectives ending in -le, the -le is replaced by -ly.
With adjectives ending in -y, the -y is replaced by -ily.
But one-syllable adjectives ending in -y simply add -ly.
With adjectives ending in -ic, -ally is added.