1. To introduce the main idea of a paragraph: A topic sentence acts as a "mini-thesis" for the paragraph, clearly stating the central point the paragraph will discuss. It acts as a roadmap for the reader, guiding them through the specific information that will be presented.
2. To provide a logical connection to the thesis statement: The topic sentence should directly relate to the overall argument or thesis statement of the essay. It should be a supporting point that contributes to the larger claim being made.
Think of it like this:
* Thesis statement: The main argument of your entire essay.
* Topic sentence: A supporting argument for your thesis, focused on a specific aspect of the main claim.
For example:
Thesis statement: Social media has had a significant impact on modern society.
Topic sentence: One major impact of social media is the spread of misinformation, which can have dangerous consequences.
This topic sentence clearly introduces the main idea of the paragraph (the spread of misinformation) and connects back to the overall thesis statement (social media's impact on society).