Here's why:
* Adverbs modify verbs, adjectives, or other adverbs. "Sometimes" tells us how often something happens, modifying the verb.
* Examples:
* "I sometimes eat breakfast." (modifies the verb "eat")
* "It's sometimes cold in the morning." (modifies the adjective "cold")
* "He walks very sometimes fast." (modifies the adverb "fast")
Let me know if you have any other grammar questions! 😊