Here are some examples:
* quick (adjective) -> quickly (adverb)
* slow (adjective) -> slowly (adverb)
* happy (adjective) -> happily (adverb)
* sad (adjective) -> sadly (adverb)
However, it's important to remember that not all adverbs end in -ly. There are many adverbs that don't follow this pattern, such as:
* very
* too
* so
* now
* then
* here
* there