The difference between 並べる(ならべる) and 並ぶ(ならぶ)
transitive and intransitive verb pair is a classic and important feature of Japanese grammar, and the pair 並べる (ならべる, naraberu) and 並ぶ (ならぶ, narabu) is a textbook example.
並べる (naraberu) is the transitive form. It describes an action where someone intentionally arranges or lines up objects. In other words, the subject actively places things in a sequence or order.
並ぶ (narabu) is the intransitive counterpart. It describes a state or spontaneous action in which people or objects are arranged in a line, or line up on their own. The focus is on the resulting arrangement rather than the agent performing the action.
Mastering this distinction is essential for producing natural and accurate Japanese, as choosing the wrong verb can subtly shift the meaning from an intentional action to a passive or self-arranged state.