Instructions: revise to remove fragnments and/or parallelism errors.

?1. I like basebal because it is fun and teaches me about the sport.

Circular thinking here = "I like baseball because it [baseball] ... teaches me about [baseball]."

??

I see no parallel construction problems nor any fragment, but I do see that error in thinking.

I like baseball, I can learn about the sport and it is also fun.

To revise the sentence and remove any fragments and parallelism errors, you can make the following changes:

"I like baseball because it is fun and it teaches me about the sport."

Here, I have fixed the fragment by adding a subject ("it") to the sentence. I have also corrected the parallelism error by using the same structure for both reasons ("because it is fun" and "it teaches me about the sport").