For example
Not Parallel: Mike likes hiking, biking, and to take afternoon naps.
Parallel: Mike likes hiking, biking, and taking afternoon naps.
OR Mike likes to hike, bike, and take afternoon naps.
Not Parallel: I took her dancing and to a show.
Not Parallel: I took her dancing and to a show.
Parallel: I took her to a dance and a show.
Not Parallel: I would rather pay for my education than financial aid.
Not Parallel: I would rather pay for my education than financial aid.
Parallel: I would rather pay for my education than receive financial aid.
Not Parallel: Mike likes swimming (noun), hiking (noun), and to ride a motorcycle (phrase).
Parallel: Mike likes swimming(noun), hiking(noun), and riding a motorcycle(noun)
Not Parallel: Mr. Haris is a lawyer (noun), a politician (noun) and he teaches (clause).
Parallel: Mr. Haris is a lawyer (noun), a lawyer (noun) and a teacher (noun).
Not Parallel: The soldiers approached the enemy camp slowly (adverb) and silent (adjective).
Parallel: The soldiers approached the enemy camp slowly (adverb) and silently (adverb)
Not Parallel: Mike likes swimming (noun), hiking (noun), and to ride a motorcycle (phrase).
Parallel: Mike likes swimming(noun), hiking(noun), and riding a motorcycle(noun)
Not Parallel: Mr. Haris is a lawyer (noun), a politician (noun) and he teaches (clause).
Parallel: Mr. Haris is a lawyer (noun), a lawyer (noun) and a teacher (noun).
Not Parallel: The soldiers approached the enemy camp slowly (adverb) and silent (adjective).
Parallel: The soldiers approached the enemy camp slowly (adverb) and silently (adverb)