Answer:
First of all, an expository essay is a genre of essay that requires the student to investigate an idea, evaluate evidence, expound on the idea, and set forth an argument concerning that idea in a clear and concise manner. To write an exposition essay you have to :
1. Select a topic
2. Write a thesis sentence
3. Select a method of development
4. Organize the essay
5. Write topic sentences for the body paragraphs of the essay
6. Write the body paragraphs of the essay
7. Furnish a paragraph of introduction