For example, you might be able to omit a topic sentence in a paragraph that narrates a series of events, if a paragraph continues developing an idea that you introduced (with a topic sentence) in the previous paragraph, or if all the sentences and details in a paragraph clearly refer—perhaps indirectly—to a main point.
The vast majority of your paragraphs, however, should have a topic sentence.
Most paragraphs in an essay have a three-part structure—introduction, body, and conclusion.
You can see this structure in paragraphs whether they are narrating, describing, comparing, contrasting, or analyzing information.
Readers generally look to the first few sentences in a paragraph to determine the subject and perspective of the paragraph.
That’s why it’s often best to put the topic sentence at the very beginning of the paragraph.Along with the smooth flow of sentences, a paragraph’s coherence may also be related to its length.If you have written a very long paragraph, one that fills a double-spaced typed page, for example, you should check it carefully to see if it should start a new paragraph where the original paragraph wanders from its controlling idea.Each part of the paragraph plays an important role in communicating your meaning to your reader.Introduction: the first section of a paragraph; should include the topic sentence and any other sentences at the beginning of the paragraph that give background information or provide a transition.Regardless of the kind of information they contain, all paragraphs share certain characteristics.One of the most important of these is a topic sentence.If a paragraph is coherent, each sentence flows smoothly into the next without obvious shifts or jumps.A coherent paragraph also highlights the ties between old information and new information to make the structure of ideas or arguments clear to the reader.THUS ALMOST EVERY TYPE OF ELECTROMAGNETIC RADIATION YET DISCOVERED HAS BEEN USED TO EXTEND OUR SENSE OF SIGHT IN SOME WAY.George Harrison, “Faith and the Scientist”In a coherent paragraph, each sentence relates clearly to the topic sentence or controlling idea, but there is more to coherence than this.