Verbs express actions, occurrences, or states of being. There are several types of verbs including action verbs, mental verbs, linking verbs, and helping verbs. Action verbs describe physical actions while mental verbs refer to cognitive states like thinking or understanding. Linking verbs describe conditions or situations like "is" or "are". Helping verbs add detail to verb tenses and convey meanings around expectations, permissions, and obligations. There are 13 verbs in English that can be used as helping verbs including forms of "be", "have", "do", "can", and "will".