Common errors in writing a topic sentence 1)Announcements rather than statements a.The subject of this paper will be my parents. b.I want to talk about the crime wave in our country. c.The "baby boom"generation is the concern of this essay.Common errors in writing a topic sentence ß 1)Announcements rather than statements a. The subject of this paper will be my parents. b. I want to talk about the crime wave in our country. c. The “baby boom” generation is the concern of this essay