introduces
In order for a paragraph to be cogent, it must support the topic sentence. If one is addressing another idea, conclude the previous thought and begin another paragraph.
It always depends on what your topic sentence was...
Reinforce
A deductive paragraph is a paragraph in which the topic sentence is stated first. The first sentence of a deductive paragraph should be the topic sentence.
the first sentence of the paragraph is called the topic sentence which should describe most of the paragraph for the reader to understand. The topic sentence is usually the first sentence of a paragraph. It makes a statement (about a topic) and the rest of the paragraph explains the topic sentence or gives examples of the topic sentence. The second sentence of a paragraph can sometimes be the topic sentence. Sometimes it is called a summary sentence.
Final.
It is the first sentence of a paragraph which is the topic sentence.
if a paragraph does not have a topic sentence then
1.Topic sentence then you 2.Reinforce then you 3.Illustrate then you 4.Conclude
The first sentence usually introduces the topic of the paragraph -- in this case, the essay topic as well. The concluding sentence of the topic paragraph is an excellent place to reinforce the essay's topic in the minds of readers.
support the topic sentence
Topic sentence