To provide information, or explain steps in a process. 

To tell a story. 

To entertain the readers.

To persuade the reader.

The hook, the topic sentence, and conclusion.

Introduction, Hook, Body

Introduction, Body, Conclusion

Claim, Counterclaim, Rebuttal. 

The body.

The introduction.

The conclusion.

Supporting details.

The statement that is the main idea of an essay.

The statement that introduces each paragraph.

The statement that grabs the reader's attention. 

The final statement in an essay.