1. The Topic Sentence
A topic sentence usually comes at the beginning of a paragraph; that is, it is usually the first sentence in a formal academic paragraph. (Sometimes this is not true, but as you practice writing with this online lesson site, please keep to this rule unless you are instructed otherwise.) Not only is a topic sentence the first sentence of a paragraph, but, more importantly, it is the most general sentence in a paragraph. What does "most general" mean? It means that there are not many details in the sentence, but that the sentence introduces an overall idea that you want to discuss later in the paragraph.
For example, suppose that you want to write a paragraph about the natural landmarks of your hometown. The first part of your paragraph might look like this:
Example :
| My hometown is famous for several amazing natural features. First, it is noted for the Wheaton River, which is very wide and beautiful. Also, on the other side of the town is Wheaton Hill, which is unusual because it is very steep. |
Consider again the above-mentioned, short paragraph:
| My hometown, Wheaton, is famous for several amazing natural features. First, it is noted for the Wheaton River, which is very wide and beautiful. Also, on the other side of the town is Wheaton Hill, which is unusual because it is very steep. |
When a reader reads a topic sentence, such as My hometown, Wheaton, is famous for several amazing natural features,a question should usually appear in the reader's mind. In this case, the question should be like, "What are the natural features that make Wheaton famous?" The reader should then expect that the rest of the paragraph will give an answer to this question.
Now look at the sentences after the topic sentence. We can see that the second sentence in the paragraph, First, it is noted for the Wheaton River, which is very wide and beautiful,indeed gives an answer to this question. That is, the second sentence gives some explanation for the fact that Wheaton is a famous town. Similarly, we can see that the third sentence also gives some explanation for the fact that Wheaton is famous by giving another example of an "amazing natural feature," in this case, Wheaton Hill.
The second and third sentences are called supporting sentences. They are called "supporting" because they "support," or explain, the idea expressed in the topic sentence. Of course, paragraphs in English often have more than two supporting ideas. The paragraph above is actually a very short paragraph. At minimum, you should have at least five to seven sentences in your paragraph. Here we can see our paragraph about Wheaton with a few more supporting sentences in bold font:
| My hometown is famous for several amazing natural features. First, it is noted for the Wheaton River, which is very wide and beautiful. Also, on the other side of the town is Wheaton Hill, which is unusual because it is very steep. The third amazing feature is the Big Old Tree. This tree stands two hundred feet tall and is probably about six hundred years old. |
3. The Concluding Sentence
In formal paragraphs you will sometimes see a sentence at the end of the paragraph which summarizes the information that has been presented. This is the concluding sentence. You can think of a concluding sentence as a sort of topic sentence in reverse.
You can understand concluding sentences with this example. Consider a hamburger that you can buy at a fast-food restaurant.* A hamburger has a top bun (a kind of bread), meat, cheese, lettuce, and other elements in the middle of the hamburger, and a bottom bun. Note how the top bun and the bottom bun are very similar. The top bun, in a way, is like a topic sentence, and the bottom bun is like the concluding sentence. Both buns "hold" the meat, onions, and so on. Similarly, the topic sentence and concluding sentence "hold" the supporting sentences in the paragraph. Let's see how a concluding sentence (in bold font) might look in our sample paragraph about Wheaton:
| My hometown is famous for several amazing natural features. First, it is noted for the Wheaton River, which is very wide and beautiful. Also, on the other side of the town is Wheaton Hill, which is unusual because it is very steep. The third amazing feature is the Big Old Tree. This tree stands two hundred feet tall and is probably about six hundred years old. These three landmarks are truly amazing and make my hometown a famous place. |
Not all academic paragraphs contain concluding sentences, especially if the paragraph is very short.
4. Details in Paragraphs
The short paragraph in this lesson is a fairly complete paragraph, but it lacks details. Whenever possible, you should include enough details in your paragraphs to help your reader understand exactly what you are writing about. In the paragraph about Wheaton, three natural landmarks are mentioned, but we do not know very much about them. For example, we could add a sentence or two about Wheaton river concerning HOW wide it is or WHY it is beautiful. Consider this revision (and note the additional details in bold):
| My hometown is famous for several amazing natural features. First, it is noted for the Wheaton River, which is very wide and beautiful. On either side of this river, which is 175 feet wide, are many willow trees which have long branches that can move gracefully in the wind. In autumn the leaves of these trees fall and cover the riverbanks like golden snow. Also, on the other side of the town is Wheaton Hill, which is unusual because it is very steep. Even though it is steep, climbing this hill is not dangerous, because there are some firm rocks along the sides that can be used as stairs. There are no trees around this hill, so it stands clearly against the sky and can be seen from many miles away. The third amazing feature is the Big Old Tree. This tree stands two hundred feet tall and is probably about six hundred years old. These three landmarks are truly amazing and make my hometown a famous place. |
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