Here's how it works:
* Adjective + -ly = Adverb
* *quick* (adjective) + *ly* = *quickly* (adverb)
* *slow* (adjective) + *ly* = *slowly* (adverb)
* *happy* (adjective) + *ly* = *happily* (adverb)
Examples:
* "The car moved quickly down the street." (Describing the manner of movement)
* "She was deeply saddened by the news." (Describing the degree of sadness)
* "He arrived punctually for the meeting." (Describing the time of arrival)
Exceptions:
* Some words ending in "-ly" are not adverbs but adjectives, like "friendly," "lovely," "silly," and "ugly."
* Some adverbs do not end in "-ly," like "well," "fast," and "hard."
In summary: "-ly" is a common suffix that transforms adjectives into adverbs, indicating how, to what extent, or when something happens.