Correlative conjunctions are connecting words used in pairs to link equivalent grammatical elements in a sentence. Some common correlative conjunctions are either/or, neither/nor, not only/but also, and both/and. They connect two equal grammatical items, such as two nouns, two verbs, or two phrases. For example, "Neither the potted ivy nor the dirty dishes have been watered" or "She will either start classes or join the Navy." The conjunctions follow specific rules depending on whether the sentence elements are singular or plural.