A paragraph should be unified around a main point. The point should be clear to readers, and all sentences in the paragraph should relate to it.
As a rule, you should state the main point of a paragraph in a topic sentence—a one-sentence summary that tells readers what to expect as they read on.
If you have trouble writing paragraphs with topic sentences, try this:
Alternately, after you have written a draft, you can check for topic sentences.
Sample formal outline: Government regulation of food choices (Harba)
Exercise:
Topic sentences