Each main paragraph must have a topic sentence, a clincher, and relevant, specific details. A topic sentence is a general statement that expresses the main idea of the paragraph. A clincher is a general statement that concludes a paragraph. It usually restates the main idea (the topic sentence) of the paragraph in a creative way. The details are the examples that support the topic sentence. They should be specific statements that are interesting, relevant to the topic, and expressed clearly in grammatically sound sentences.