The rules

Adverbs are usually formed by placing –ly after an adjective

Slow -> slowly, beautiful -> beautifully

Some adverbs are irregular

Good -> well

If the adjective ends with ‘y’ the ‘y’ changes into ‘i’ before adding –ly

Example: Angry -> angrily

If the adjective ends with –able, –ible or –le

The ‘e’ changes into ‘y’

Example: terrible -> terribly

If the adjective ends with –ic

Add –ally

Example: artistic -> artistically

Adverbs are usually placed after the verb.

He speaks clearly

When there is an object, the adverb is usually placed after the verb + object.

Adverbs are never placed between object and verb

I read the book quickly (Correct)

I read quickly the book (Incorrect)

Sometimes adverbs are placed at the beginning of a sentence.

Quickly, I changed my opinion

I quickly changed my opinion