Topic Sentences for Letter to the Teacher A topic sentence is the first sentence of a paragraph. Its purpose is to let your reader know what the topic of the paragraph is; it does NOT have any examples/supporting evidence in it. Possible examples might be: Paragraph One 1. There are many interesting facts about my life. 2. In order to know me better, I will tell you some things about me, my family, and things I like to do. 3. Since you do not know me, I would like to tell you a few things about myself. Paragraph Two 1. Language arts is/is not my favorite subject. 2. I like/dislike language arts. 3. Language arts and I don’t get along. Paragraph Three 1. I have several goals for my life. 2. Setting goals for my life is not easy. 3. It’s important to set goals.