TOPIC SENTENCES. A well-organized paragraph supports or develops a single controlling idea, which is expressed in a sentence called the topic sentence. A topic sentence has several important functions: it substantiates or supports an essay's thesis statement; it unifies the content of a paragraph and directs the order of the sentences; and it Matt Ellis Updated on June 2, 2022 Students A topic sentence, usually the first sentence in a paragraph, introduces the main idea of that paragraph and sets its tone. A topic sentence is especially important in essays, where topics change from paragraph to paragraph. In the topic sentences provided in the other examples on the previous page, the controlling ideas are: The subjection of children to forced labour through trafficking has age and gender dimensions. The ILO alone cannot respond to all the recommendations of the Commission's report. Every topic sentence has two parts: a topic (what the paragraph is about) and a controlling idea (the direction the paragraph will take). Take a look at these topic sentence examples in which the topic is bold and the controlling idea is in italics. .

topic sentence and controlling idea examples