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Answer Key
1. Not Parallel. It mixes gerunds (hiking, swimming) with an infinitive (to ride). Should be "riding."
2. Parallel. Three imperative verb phrases: work hard, play fair, be honest.
3. Not Parallel. Mixes adverbs (quickly, accurately) with a prepositional phrase (with thoroughness). Should be "thoroughly."
4. Parallel. All three activities are gerund phrases.
5. Not Parallel. After "not only" there's a noun phrase, but after "but also" there's a verb phrase.
6. Not Parallel. Mixes gerunds (brushing, checking) with an infinitive (to make).
7. Parallel. Three adjectives describing the candidate.
8. Not Parallel. Mixes a gerund (Learning) with an infinitive (to learn). Should be "learning."
9. Parallel. "Either... or" connects two verb phrases.
10. Not Parallel. First two are adjectives, last is a prepositional phrase. Should be "professional."