Whether one is writing an academic essay, a stand-alone paragraph, a personal communication, or a business communication, understanding how a topic sentence functions will strengthen and improve one’s writing by enhancing its clarity and effectiveness. The topic sentence is often the first sentence in a paragraph, and it thus occupies a crucial position. It is expected that the topic sentence will set the stage for the information to follow, and the topic sentence generally serves as a barometer by which a reader gauges the strength of an argument. The topic sentence can sometimes come in the middle or at the end of the paragraph and act as a summary of the important information, but this can be tricky and less effective than placing it at the beginning. The Topic and the Controlling Idea The most effective topic sentences consist of two parts: a topic and a controlling idea. The topic introduces the general idea that the writer will discuss and the controlling idea limits that idea so that it is manageable. For example, if a student were asked to write a paragraph about a memorable experience, he/she might be tempted to simply write “I had a memorable experience.” While this is true, this statement is also very broad and could discuss any number of memorable experiences that the student had. As a result, this topic sentence does not adequately limit the idea to material that can be covered in one paragraph. Instead, saying “I had a memorable experience while I was living in Peru” would more adequately outline to the reader what information the paragraph will discuss. In this case, the “memorable experience” is the topic and the clarification “while I was living in Peru” is the controlling idea that narrows the topic to a more specific guideline. “The What and the Why” In most writing, simply stating a fact is not sufficient; the author is generally expected to support an argument or idea with convincing evidence. The topic sentence helps the writer set up the paragraph in a way that will accomplish these goals. As such, it can be helpful to think of a topic sentence as “the what and the why” of the paragraph. The topic states what the paragraph will be about and the controlling idea often details why it is important. For example, if a student were asked to write about the benefits of cell phones, simply stating that “Cell phones are beneficial” makes for a fairly weak topic sentence. Adding a controlling idea that explains why cell phones are beneficial makes for a much stronger topic sentence. In this case, the student could say that “Cell phones are beneficial because they allow a person to remain in close contact with family and they can be very helpful in an emergency.” Now, the reader understands the what of the argument (cell phones are beneficial) and has an insight into why (they allow a person to remain in close contact with family and they can be very helpful in an emergency). Do All Paragraphs Have Topic Sentences? There are a few types of paragraphs that do not require topic sentences. For example, narrative paragraphs which tell a story often do not require an explicit topic sentence as this would become awkward and cumbersome to the story-telling. Descriptive paragraphs that describe a location or an event may not have a topic sentence either. However, for most academic paragraphs which offer an argument or proposition, topic sentences are a must. They are also extremely useful for beginning writers or students who have difficulty with organization or clarity in their writing. How Does a Topic Sentence Differ From a Thesis Statement? A topic sentence can be thought of as a mini-thesis. A thesis usually comes at the end of the first paragraph in an essay, and it controls the direction of the entire essay. A topic sentence serves a similar function, but it is usually located at the beginning of a paragraph and it works on a more limited scale by guiding the direction of a single paragraph rather than a full-length essay. A topic sentence often works in conjunction with a thesis statement to develop a specific part of an essay's argument. Learning how to construct effective topic sentences will undoubtedly increase the authority and strength of one’s writing and can be helpful in many genres of writing. For more information on topic sentences and thesis statements, please consult the “Paragraphs and Topic Sentences” page for Indiana University’s Writing Tutorial Services.
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