Here's why:
* Verb: The core of the phrase is a verb ("be", "tired", "angry").
* Phrase: It's a group of words that functions as a single unit within a sentence.
* Function: In this case, the verb phrase acts as the predicate of a sentence, telling us something about the subject.
For example:
* She is tired. ("is tired" is the verb phrase, acting as the predicate)
* He was angry. ("was angry" is the verb phrase, acting as the predicate)
These verb phrases are also examples of linking verbs because they connect the subject to a noun, pronoun, or adjective that describes or renames the subject.