1) Adverbs modify verbs, adjectives, or other adverbs and can indicate manner, location, time, or frequency. 2) Many adverbs are formed by adding "-ly" to adjectives. Exceptions include very, hardly, and lately. 3) Not all words ending in "-ly" are adverbs, and not all adverbs are formed by adding "-ly". 4) The rules for adding "-ly" depend on whether the adjective ends in "-y", "-le", or "-ic".