ADVERBS of MANNER

Most of the adverbs answer the question HOW? and are called "adverbs of manner". They are usually formed adding -ly to an adjective:
- happy + -ly = happily
- He is a happy man
- He dances happily how does he dance? happily
- A slow train moves slowly
More adverbs of manner: calmly, beautifully, badly, nicely, strongly, sadly, softly, ridiculously, madly, quickly, etc.

But a few adverbs of manner don't end in -ly (fast, hard, well, fine):
- A fast train moves fast
- He worked hard for his family
- I play the piano well
- You are doing this fine

POSITION IN THE SENTENCE

They can go before or after the verb:
- She walked across the living-room
- She quietly walked across the living-room
- She walked quietly across the living-room
- She walked across the living-room quietly

The most common position is after the verb (some adverbs can ONLY go after the verb). But if it is a transitive verb with a direct object, we need to put it AFTER the direct object, because in English we can't separate a transitive verb from its objet:

- He eats fast.
- He eats bread fast.
- He eats fast bread.