Parallelism is used to balance nouns with nouns, prepositional phrases with prepositional phrases, participles with participles, infinitives with infinitives, clauses with clauses, it basically means similarity in construction and position.
Item in a series must be parallel: It means, they must have the same Grammatical construction.
He likes music, art, and science.
He is tall, cool, and handsome. (Adj)
They wanted to paint the living room, to lay a new carpet, and to buy a new sofa. (Infin)
He likes dancing, swimming, and painting. (Verb + Ing Form)
Taking the bus can be as costly as taking a plane (V + Ing)
He wanted to borrow a car or to rent one while his car was being repaired. (Infin)
Eating in a restaurant is more fun than cooking at home
Although he liked to eat good food, he did not like to pay high prices for it. (Infin)
The Romans conquered, colonized, and governed much of the world.
Past Perfect Tense:
He had finished the game, had taken a shower, and had eaten lunch by the time I went to his house.
Note: The auxiliary "had" may be omitted in the second and the third verb phrases.
The structure joined by and, but, as, or then, or although must have the same grammatical form.
He enjoyed the music of Spain and the sculpture of France.
That verb form is not active, but passive (Adj)
Now let’s see some examples:
1. Her husband had bought a car, found a job, and choose a school for the children before she arrived. (Wrong)
Her husband had bought a car, found a job, and chosen a school for the children before she arrived. (Right)
2. That soup should not be served hot, but at a cold temperature. (Wrong)
That soup should not be served hot, but cold. (Right)
3. Renting an apartment can be as expensive as to buy a house. (Wrong)
Renting an apartment can be as expensive as buying a house. (Right)
4. He is young, intelligent, and has charm. (Wrong)
He is young, intelligent, and charming. (Right)
5. She likes to read, to travel and blogging. (Wrong)
She likes to read, to travel, and to blog. (Right)
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