The phrase "neither...nor" is used to connect two negative ideas or options, indicating that both are excluded. For example, in the sentence "She likes neither apples nor oranges," it means that she does not like either fruit. This construction emphasizes the absence of both choices. In writing, "neither...nor" helps to create clarity and avoid confusion. It can be used with singular or plural nouns, depending on the context. For instance, "Neither the cat nor the dog is allowed on the couch" shows that both animals are prohibited from that area.