A fourth method of building up a paragraph from a topic-sentence consists in telling what it is not; that is, giving the obverse.
In isolated paragraphs, paragraphs that are indeed compositions in miniature, the topic-sentence is the first sentence.
A paragraph with no topic-sentence is most common in narration and description.
Below are four paragraphs, from different forms of discourse, all having the topic-sentence at the beginning.
In narration and in a short paragraph of description this paragraph of details is frequently without a topic-sentence.
In these cases the topic-sentence follows the transition, and it may come as late as the middle of the paragraph.
In exposition and argument, and sometimes in the other forms of discourse, the topic-sentence may be at the end of the paragraph.
A third method of developing a paragraph from a topic-sentence is by repetition.
The main sentence in a paragraph, often the first sentence. It briefly conveys the essential idea of the paragraph.