A common linking verb is 'are, ' which is used to connect the subject of a sentence with a predicate. It is used to indicate a state of being or existence, and is one of the most commonly used verbs in the English language. It is also used to link two nouns together, such as in the phrase 'the cat and the dog are friends.' Additionally, it can be used to link an adjective to a noun, such as in the phrase 'the flowers are beautiful.'