Identifying the topic sentence

A topic sentence states the main idea of a paragraph. Knowing how to identify the topic sentence is an important skill that helps you understand the main point the author makes in a paragraph. 

To determine whether a sentence is a topic sentence or not, one important factor to consider is its position. The possible positions of a topic sentence include:

1. The first sentence of a paragraph;

2. The middle of the paragraph, especially the second or the third sentence;

3. The very end of a paragraph, functioning as a summary or a conclusion.

Another factor to consider is the type of idea or information given in the sentence. The topic sentence is a general statement that can cover all other information in the paragraph. For instance, if a sentence talks about several things and looks at the big picture, it is very likely the topic sentence. In contrast, sentences that provide specific details, e.g. explanation, reasons, examples, statistics, or facts, are supporting sentences.

Example 1:

But women grow up thinking they need to look loke Barbie dolls or girls on magazine Covers, which for most women is impossible. Nonetheless, the multibillion-dollar beauty industry, complete with its own aisle in the… (Para. 7, Text A)

The topic sentence is the first sentence in the paragraph. It states a general idea: women are enthusiastic about pursuing a perfect look under the influence of the beauty industry. All the other sentences contain specific details which explain and illustrate this idea.

Example 2:

Women do not look at themselves this way. If I had to guess what most women think about their appearance, it would be: “Not good enough.” no matter how attractive a woman may be, her perception of herself is eclipsed by the beauty industry… (Para. 5, Text A)

The topic sentence is the second sentence. The first sentence functions as a transition from the previous paragraph.

Example 3:

To avoid sleep problems, alcoholic beverages or drinks with caffeine should not be taken before bedtime. Another way to avoid sleep problems… These are some simple guidelines that can help you avoid sleep problems. 

The topic sentence appears at the end, summarizing what has been discussed before.

阅读下图，了解topic和main idea的区别:

What are Transition Words and how Do I use Transition Words for Essays? 

Transition words and phrases help make your essay flow smoothly from paragraph to paragraph. You can use them at the ends and beginnings of paragraphs, as well as in your introduction and conclusion. Transition words and phrases can be used in every type of essay, but they are most appropriate in expository or argumentative essays in which it’s important to present your ideas in a clear, logical flow. Read on for more insight into transition words for essays, including lists, examples and descriptions of how to use them in your writing.

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