which sentence does the topic sentence follow?
<answer> The topic sentence is usually the first sentence of a paragraph, but not necessarily. <context> All three paragraphs start out well with a topic sentence. A topic sentence is a sentence whose main idea or claim controls the rest of the paragraph; the body of a paragraph explains, develops or supports with evidence the topic sentence's main idea or claim. The topic sentence is usually the first sentence of a paragraph, but not necessarily. It may come, for example, after a transition sentence; it may even come at the end of a paragraph. Topic sentences are not the only way to organize a paragraph, and not all paragraphs need a topic sentence. For example, paragraphs that describe, narrate, or detail the steps in an experiment do not usually need topic sentences. Topic sentences are useful, however, in paragraphs that analyze and argue.