Mommy is teaching expository writing. For those of you who are not in fourth grade, that means, steps in a process. Let's try it.
Finding the perfect tree can be a challenging process. (catchy topic sentence.) First, you must search though hundreds of possibilities.
Look to your left, and your right. Be careful so you don't miss it!
Then, you get the saw and begin cutting down your tree. It is important to wear safety goggles and have the proper assistant. (transition, with detail sentence)
Next, you send your tree through this fancy machine that binds it up, really tight. whirrrrrr (notice the use of onomatopoeia)
Once you get the tree home, let it rest for 24 hours. Then, you can begin decorating. Carefully hang the ornaments, near the bottom of the tree so the kitties have something to play with.
Then, place the star on top of the tree.
Finally, enjoy! (final step) Follow these simple steps, and setting up your tree will be a piece of cake! (you really should never use cliches in your formal writing.)