Parallel Structure

Parallel structure means using the same pattern throughout the sentence. Usually, words, clauses or phrases using parallel structure are joined by coordinating conjunctions.

Example #1:
Words ending in -ing (gerund) form:

Incorrect: She went skiing, sledding, and snowboarded this weekend.
- Do not mix forms: skiing, sledding, snowboarded
Correct: She went skiing, sledding, and snowboarding this weekend.
- All words ended in -ing: skiing, sledding, and snowboarding

Example #2:
Infinitives:

Harley likes to read, to write, and to draw illustrations. OR
Harley likes to read, write, and draw illustrations.
- Use to before all the words, or before the first word in the list.

Example #3:
Clauses:

Not parallel: The students were told that they would present their presentation during class, that they would be able to use their notes, and had to answer questions asked by their peers. (Note: the last clause is also passive voice)
Parallel: The students were told that they would present their presentation during class, that they would be able to use their notes, and that peers would ask questions after the presentation.

Practice Quiz #1
Practice Quiz #2
Practice Quiz #3