Parallelism

Parallelism means that all items in a list have the same tense (present, past, future, or continuous.

 

Each plan would 1) restore the ecosystem, 2) clean up water pollution, 3) ensure water supply for cities and farms, and 4) improve levees to keep us all safe from floods.

With the -ing form (gerund) of words: Mary likes 1) hiking, 2) swimming, and 3) bicycling.

With infinitive phrases: Mary likes to hike, to swim, and to ride a bicycle. OR Mary likes to hike, swim, and ride a bicycle.

Not Parallel: Mary likes hiking, swimming, and to ride a bicycle.

Parallel: Mary likes hiking, swimming, and riding a bicycle.

Not Parallel: The production manager was asked to write his report quickly, accurately, and in a detailed manner.

Parallel: The production manager was asked to write his report quickly, accurately, and thoroughly.

Not Parallel: The coach told the players that they should get a lot of sleep, not eat too much, and to do some warm-up exercises before the game.

Parallel: The coach told the players that they should get a lot of sleep, not eat too much, and do some warm-up exercises before the game.