I need help with topic sentence on a book character. the book is chrysalids and my charcter is David strorm. im not sure how to write a topic sentence any examples?

http://www.arts.uottawa.ca/writcent/hypergrammar/partopic.html

Read carefully.

Basically, the topic sentence is the main idea of the entire paragraph. All the other sentences should be supporting details for the topic sentence.

Give it a try, and someone here will be able to help you.