What is the best definition for a 'topic sentence'?

Question

BlackTom AI · Accepted Answer

The question asks: What is the best definition for a 'topic sentence'?

In this case, the options list is missing, so there are no alternative statements provided to compare against. Nevertheless, the given correct answer states: 'b. A sentence which always expresses the main idea of a paragraph in which it appears, usually at the beginning of a paragraph.'

Why this definition is accurate: A topic sentence typically announces the main idea or central point of a paragraph, giving readers a clear sense of what the paragraph will discuss. It often appears at the beginning of the paragraph, serving as a guidepost for the supporting sentences that follow. This aligns with common writing conventions that use a vivid, concise sentence to set the paragraph’s focus and direction.

Why this conceptual definition matters: Understanding that the topic sentence centers the main idea helps writers organize paragraphs logically and helps readers quickly grasp the paragraph’s purpose. It also supports cohesion within a piece by linking a paragraph’s details back to its central claim.

If other options had been present, we would assess them as follows: options claiming that a topic sentence is optional or only expresses a secondary idea would be incorrect, since topic sentences are conventionally central and often placed at the start. Any statement suggesting that topic sentences apply to every sentence or that they must be lengthy would also be inaccurate, as topic sentences are typically concise and focused on the main idea, not a summary of the entire paragraph.

In sum, the stated definition captures the core function and typical placement of a topic sentence in standard expository writing.

MUF0011 English Unit 1 - Semester 1, 2025 3.9 Synthesis Quiz

What is the best definition for a 'topic sentence'?

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