The paper had a purpose or theme which is introduced in the introduction, developed in the body of the paper, and returned to in the conclusion. Paragraphs are linked to each other in a logical sequence using transitional sentences. Arguments, examples, facts, opinions, and details explain the main point and lend credibility to each point being developed. In the best papers, words are chosen carefully and sentences are constructed purposefully so that each point the author makes is expressed exactly, precisely, and as clearly as possible. The best papers are characterized by consistently correct grammar, punctuation, and spelling.
Verbs agree with their subjects.
There are no single sentence paragraphs.