Parallel construction means that words or phrases are written in the same form. If
one phrase in a list begins with "of," then other phrases should, too. If one phrase
uses the verb form ending in "ing," then other phrases should, too. Here is an example
of mismatched sentence parts:
I like skiing, ice skating, and to hike.
Here we have two "ing" verb forms and one infinitive ("to hike"). By using matched
parts, we can improve the parallelism: