This document provides information about paragraphs and their structure. It defines a paragraph as a group of sentences that develop one topic or idea. A well-organized paragraph includes a topic sentence, supporting sentences, and a concluding sentence. The topic sentence expresses the main idea of the paragraph and lets the reader know what the paragraph is about. It should be placed at the beginning of the paragraph. Supporting sentences provide details and evidence about the topic. The concluding sentence wraps up the main point. Examples are provided to illustrate topic sentences and analyzing the main idea and structure of paragraphs. Exercises are included for students to practice writing topic sentences.