Which feature signaling the paragraph’s main idea is commonly placed at the beginning?

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The main signal for a paragraph’s central idea is the topic sentence, and it’s commonly placed at the beginning to set the focus right away. A topic sentence states the main point in one clear idea, giving readers a map of what the paragraph will argue or describe. When it appears up front, everything that follows—evidence and details—can be seen as support or elaboration for that point, which keeps the paragraph organized and easy to follow.

Evidence and supporting details are the specifics that back up the main idea, not the declaration of it. Transitions, meanwhile, help move smoothly from one thought to the next, linking sentences together, but they don’t usually signal the paragraph’s main point themselves. So, placing the main idea at the beginning with a topic sentence is the most direct way to signal what the paragraph is about.