Linking verbs are verbs that connect the subject of a sentence to a subject complement, which can be a noun, pronoun, or adjective. They do not show action but instead describe a state of being or condition. Common linking verbs include forms of the verb to be (am, is, are, was, were) and verbs like seem, become, and appear. These verbs help provide more information about the subject. For example, in the sentence "The sky is blue," the verb "is" links the subject the sky to the adjective blue, describing its state. Linking verbs are essential for creating clear and descriptive sentences.