These are quite easy to spot, actually. A clear example can be found here.
The telling feature is, as you might have guessed, a narration–but not just any kind of narration. The point here is that the narration involved is meant to support the main thesis / conclusion of the argument. It serves as a good reason to accept the conclusion.
Can you tell which thesis / conclusion is being argued here? Were there any other argument forms that you could spot in the article? Could there be an argument from analogy present here, as well?
Posted by ifathenb 
