A paragraph that begins with a topic sentence sometimes ends with a sentence of conclusion.
(c) the final sentence either emphasizes the thought of the topic sentence or states some important consequence.
Each division and subdivision will naturally contain a topic sentence.
This can sometimes be done by a mere word or phrase (again; therefore; for the same reason) in the topic sentence.
Does he place the topic sentence near the beginning of the paragraphs?
Sometimes, however, it is expedient to precede the topic sentence by one or more sentences of introduction or transition.
Perhaps you expect to begin with, or to lead up to, a topic sentence.
The brief paragraphs of animated narrative, however, are often without even this semblance of a topic sentence.
In this paragraph every sentence is a repetition of some part of the opening or topic sentence, and serves to explain it.
Is his last sentence, in case it is a repetition of the topic, longer or shorter than the topic sentence?
The main sentence in a paragraph, often the first sentence. It briefly conveys the essential idea of the paragraph.