Here's why:
* Verb: "Understand" is the main verb in the sentence, indicating an action or state of being.
* Adverb: "Never" is an adverb that modifies the verb, telling us how often the action happens (not at all).
Even though "never" appears before "understand," it doesn't become part of the verb phrase. Verb phrases typically include the main verb and any helping verbs (auxiliary verbs) that might be present (like "has," "will," "have been," etc.).