Understanding how to build a well-structured paragraph is one of the most important skills in academic writing. Just like a hamburger has layers — buns, meat, and vegetables — a paragraph has three essential components: the topic sentence, the supporting sentences, and the concluding sentence. Mastering this structure makes your writing clearer, more persuasive, and easier to follow.
What is the topic sentence and why does it matter?
The topic sentence is the first and most important sentence in a paragraph [0:42]. It serves two purposes: it states the topic and it limits that topic to a specific idea. This limitation is what gives the paragraph focus and direction.
In the example analyzed during the lesson — taken from Writing Academic English by Oshima and Hoke — the topic sentence reads: "Gold, a precious metal, is prized for two important characteristics." [1:24] Here, "gold" is the topic, while "two important characteristics" is the controlling idea. The writer is telling the reader exactly what to expect: not everything about gold, just two specific characteristics.
- The topic sentence introduces the subject.
- The controlling idea narrows the focus.
- Together, they set the reader's expectations for the rest of the paragraph.
How do supporting sentences develop the main idea?
The supporting sentences are the body of the paragraph [0:52]. They provide examples, statistics, and arguments that back up the topic sentence. Without strong support, a paragraph feels empty and unconvincing.
In the gold paragraph, two sentences directly support the topic sentence [3:15]:
- "First of all, gold has a lustrous beauty that is resistant to corrosion." — This introduces the first characteristic: beauty.
- "Another important characteristic of gold is its usefulness to industry and science." — This introduces the second characteristic: utility.
Everything else between these two key sentences serves as further explanation and evidence. For instance, the example of a Macedonian coin that looks the same after 25 centuries [2:09] illustrates gold's lasting beauty. Similarly, mentions of photography, dentistry, and astronaut suits demonstrate gold's industrial usefulness [2:26].
What makes a strong supporting sentence?
- It connects directly to the topic sentence.
- It uses specific examples rather than vague claims.
- Additional sentences explain or expand on it with concrete evidence.
Notice how the paragraph uses transition words like "First of all," "Therefore," "For example," and "Another important characteristic" to guide the reader smoothly from one idea to the next.
What role does the concluding sentence play?
The concluding sentence closes the paragraph by restating and paraphrasing the main idea [4:00]. It does not introduce new information. Instead, it reminds the reader of what was discussed.
In the example, the concluding sentence is: "In conclusion, gold is treasured not only for its beauty but also for its utility." [4:10] Notice how it mirrors the topic sentence — the two important characteristics (beauty and utility) are rephrased using slightly different words. This technique of paraphrasing reinforces the message without sounding repetitive.
How can you practice writing paragraphs with this structure?
Three topic sentences were suggested as writing prompts [4:38]:
- "Learning online requires discipline and motivation."
- "When buying cell phones, people should look for two important features."
- "Driving requires alertness and skill."
Each of these follows the same pattern: a clear topic plus a controlling idea that limits what you will discuss. When writing your own paragraph, remember to:
- Start with a focused topic sentence.
- Add supporting sentences with examples and evidence.
- End with a concluding sentence that paraphrases your main point.
- Use transition words to connect your ideas naturally.
The hamburger analogy [0:28] is a simple but powerful way to remember paragraph structure: the top bun is your topic sentence, the fillings are your supporting sentences, and the bottom bun is your concluding sentence. Every layer matters.
Now it's your turn — pick one of the three prompts and share your paragraph in the comments. Don't forget to clearly identify your supporting sentences and your concluding sentence!
