The topic sentence tells what the paragraph is about.
http://www.indiana.edu/~wts/pamphlets/paragraphs.shtml
How do you set up a topic sentence when writing an english paper?
2 answers
Take your main subject and divide it into the main points you want to make. Then take each of those main points and think of three ideas you want to use to support that point. .....THEN write your "topic" sentence for that main point to set up those support ideas.
Here are some sites on writing topic sentences:
http://www.writingcentre.uottawa.ca/hypergrammar/partopic.html
(Broken Link Removed)
Here are some sites on writing topic sentences:
http://www.writingcentre.uottawa.ca/hypergrammar/partopic.html
(Broken Link Removed)