An academic essay is a focused piece of writing that develops an idea or argument using evidence, analysis and interpretation. There are many types of essays you might write as a student. The content and length of an essay depends on your level, subject of study, and course requirements. However, most essays at university level are argumentative : they aim to persuade the reader of a particular position or perspective on a topic.
Teaching Main Idea in Reading and Writing: Tips to Engage Your Students
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The main idea, or topic, sentence of a paragraph is the sentence that gets to the heart of the subject of that paragraph. The purpose of a main idea sentence is to tie together all the other facts presented in a paragraph to prove the author's point. While elementary students are most often taught that the topic sentence should be the first sentence of the paragraph, it's possible to make the main idea clear to readers in more subtle ways -- without leading with a blanket statement.