1. What is a parallel structure?
Parallel structure (also called parallelism) is the repetition of a chosen grammatical form within a sentence by making each compared item or idea in your sentence follow the same grammatical pattern, you create a parallel construction
Example
Not Parallel:
Ellen likes hiking, the rodeo, and to take afternoon naps.
Parallel:
Ellen likes hiking, attending the rodeo, and taking afternoon naps.
OR
Ellen likes to hike, attend the rodeo, and take afternoon naps.
so as you can see haha parallel structure is fixed in sentence while the not parallel is not fixed in sentence or not complete
CORRECT ME IF IM WRONG