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A Closer Look at the Parts
Topic Sentence
The topic sentence tells your reader what the paragraph is about. It also helps you keep your writing under control. Here is a formula for writing good topic sentences.

Helpful Hint
A sentence like "Walking around London is good" would not make a strong topic sentence because it does not express a specific focus about the topic.
Body
The body is the main part of the paragraph. The sentences in the body should include specific details that support the topic sentence. You can use facts, statistics, reasons, examples, quotations, sensory descriptions, and so on. (See page 44.) They can come from your personal knowledge of the topic or from other sources.
Organize your details so that the reader can easily follow them. The details in “Walking London” follow spatial organization, letting the walking path unfold, location by location.