How do i make a sentence using the word protagonist?

Firstly, in order to construct a sentence, you must have full understanding of what you're writing. The Word you must include is protagonist. That means the main character of story, whom everything revolves around.

In the sentence "Katie peered around the corner nervously.", Katie is the protagonist because she is very obviously the subject of the sentence and the story the sentence belongs to. Now that you know what protagonist is, you can go anywhere from there. If you know how to use a Word, you can do anything with it. A sentence could be a definition, or part of a story. You decide, you're the author of it! Here's a few examples.

"The protagonist of Priscilla and the Wimps is Priscilla," Jayde explained importantly.

A protagonist has the whole story on their shoulders, because they are the conductor of it.

"You are the protagonist of your very own story!" exclaimed the dramatic teacher.