When you write about an opinion, it is different from writing a story.  It does not need to have a character, a setting or actions.   But you have to tell people what you think.  First, you have to say what your opinion is, and then you MUST tell the readers a few reasons so they can understand why you think that way.
You can write about your opinion on any topic you like, or you can also practice writing an opinion using these ideas:
1. The most awesome superhero is ________.
2. The best animal to pick as a pet is ________.
3. The worst animal to pick as a pet is ________.
4. The best video game is ________.
5. The bravest person in my family is ________.
6. The silliest person in my family is _______.
7. The kindest person I have ever met is _______.
8. What kind of toys they should put in the Happy Meal?
9. What kind of food they should have in school cafeteria?
10. What is the best job in the whole world?
11. Are unicorns real?
12. Are space aliens real?
13. Are dinosaurs real?
14. Is magic real?
15. Is it wrong for Goldilocks to go in the bears’ house?
16. Is it wrong for Jack to climb the beanstalk to the giant’s house?
17. Is Elsa from Frozen a good sister?
18. Is Kylo Ren a good guy or a bad guy?
19. Which one is easier, learning to swim or learning to ride a bicycle?
20. Which one is harder, skateboarding or juggling?
21. Which one is  harder to catch, a frog or a butterfly?
22. What do you like more, Halloween or Christmas?
23. What do you like more, cupcake or pizza?
24. What do you like more, winter or summer?
25. What do you like more, candies or ice-cream?
26. What do you like more, pancake or cereal?
27. What do you like more, a pet dog or a pet cat?
28. On a hot day, the best place to go is __________.
29. Should kids watch scary movies?
30. Should kids help wash dishes?
 
Tips for parents
Help your child choose a topic and an opinion to express.  Let your child come up with their own reasons why they have that opinion.  Ask your child to write those reasons down independently.  Come back and discuss what they have written.  Focus on the reason, not so much on the spelling.  Talk about if the sentences support the opinion.  Let your child judge whether to keep a supporting reason or to replace it with a different idea.
For example:
“The Lego movie is very funny.  There is a Batman in that movie.  I watch it on Netflix. I like that movie”  
If you child wrote something like this, ask guiding questions to improve the first draft:
When someone reads this, will they figure out what is so funny about that movie?  Where does it tell them that? 
If a person disagree with you (“they think the Lego movie is not funny”), what would you say to try to change their mind?
Which of these sentences do you think you could change to show WHY you have that opinion? Which of these sentences is NOT helping to show why you have that opinion?
 
After making changes, rewrite it on a new sheet of paper, this time, you can point out mistakes in spelling or punctuation (uppercase, periods, etc.).
Goal:
Write two ‘Opinion Essays’ by the end of the month.  Each essay must state an opinion, with 2 or 3 reasons to support that opinion.
The actual quality of the writing is not the most important thing.  The MAIN IDEA is whether students understand there are different purposes of writing, writing an opinion has a different purpose from writing a story.