parallel structure
Matching forms in a list or a comparison.
In a list or a comparison, keep the same grammatical form. If the first item is a gerund, the rest are gerunds: She likes cooking, swimming, and reading. If the first is a base verb, the rest are base verbs. The items may be words, phrases, or clauses. Keep them the same kind.
Examples
UseI like hiking, swimming, and reading.
AvoidI like hiking, swimming, and to go to the movies.
UseThe job includes sorting mail, stacking boxes, and working nights.
AvoidThe job includes sorting mail, stacking boxes, and the night shift.