What is the difference between a topic sentence and a supporting sentence in a paragraph?

It looks like your follow-up might be incomplete (perhaps starting a numbered list or referring to a specific point?). Based on the original question about topic sentences versus supporting sentences, I'll expand on the difference with more detail and an example to clarify. If this isn't what you meant, feel free to provide more context!

Key Differences:

1. Topic Sentence: This is the "hook" or foundation of the paragraph. It introduces the main idea or central claim in 1–2 sentences, usually at the beginning (though it can appear elsewhere). Its purpose is to guide the reader on what the paragraph will discuss, without providing details yet.

2. Supporting Sentences: These follow the topic sentence and build on it by providing evidence, examples, explanations, statistics, or anecdotes. They "support" the main idea, making it more convincing or detailed. Typically, there are 2–5 of these per paragraph, and they don't introduce new unrelated ideas.

Example Paragraph:

Topic sentence: Renewable energy sources, such as solar and wind power, are essential for reducing global carbon emissions.
Supporting sentences: Solar panels convert sunlight into electricity without producing greenhouse gases, making them a clean alternative to fossil fuels (evidence). For instance, countries like Germany have installed millions of solar panels, resulting in a 40% drop in coal usage over the past decade (example). Additionally, wind turbines harness natural wind patterns to generate power, which is both cost-effective and scalable for urban areas (explanation).

This structure ensures the paragraph stays focused and persuasive. How can I help further—maybe with practice exercises?