An expository essay is like a research essay but the only difference is that you are providing evidence and you are including your point of view or argument on topic. To help you with your expository essay you could use:
Cause & Effect
Problem & Solution
Compare & Contrast
Or Examples.
* Hope this helps:) I tried to make my answer as simple as much as I could instead of COPYING from the internet. So just to let you know this not COPIED! IT'S IN MY OWN WORDS! :)