A sentence is a group of words expressing a complete thought, typically containing at least a subject and a predicate, while a paragraph consists of a series of such sentences organized around a single idea, beginning with a topic sentence to introduce the main point, followed by supporting sentences to elaborate or provide evidence, and often ending with a concluding sentence that summarizes or reinforces the main idea; a well-structured paragraph presents its argument clearly, each sentence contributing to a logical flow and supporting the unity of the whole
