State verbs are verbs that indicate a state or condition rather than an action, and are not usually used in Continuous (Continuous verb forms such as Present Continuous, Past Continuous, etc.). They describe permanent or long-lasting states, not specific actions. In Past Perfect Continuous, state verbs can be used, but their use is usually limited.
Some examples of state verbs:
● to be
● to have
● to like
● to love
● to hate
● to know
● to understand
● to believe
● to prefer
● to belong
● to seem
● to resemble
● to contain
● to consist
Some of these verbs can be used in Continuous forms if they are used in a specific context that implies a temporary state rather than a permanent one. However, even in Past Perfect Continuous, where Continuous forms are allowed, state verbs are not always used with them because they describe permanent or stable states that do not change over time.