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In many languages, the fundamental unit of composition is the paragraph. A paragraph consists of several sentences that are grouped together. This group of sentences together discuss one main subject. In U.S. formal academic English, paragraphs have three principal parts. These three parts are the topic sentence, body sentences, and the concluding sentence. We will also talk briefly about details in paragraphs.
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:
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.
(Notice how the first sentence begins with "My hometown..." a few spaces to the right of the paragraph edge. This is an indentation. All paragraphs in English MUST begin with an indentation.)
Note how the first sentence, My hometown, Wheaton, is famous for several amazing geographical features,is the most general statement. This sentence is different from the two sentences that follow it, since the second and third sentences mention specific details about the town's geography, and are not general statements.
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:
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.
(Notice how the first sentence begins with "My hometown..." a few spaces to the right of the paragraph edge. This is an indentation. All paragraphs in English MUST begin with an indentation.)
Note how the first sentence, My hometown, Wheaton, is famous for several amazing geographical features,is the most general statement. This sentence is different from the two sentences that follow it, since the second and third sentences mention specific details about the town's geography, and are not general statements.