The new president promised not only to restructure the economy but also to balance the budget.
(This sentence is parallel because the two clauses use a matching verb phrase “to restructure the economy” and “to balance the budget.”)
Shaun likes to play football, read books, and paint portraits.
(This sentence is parallel because Shaun’s hobbies are listed using the same verb tense: play, read, and paint.)
Lynette finished her homework during recess and submitted it before class.
(This sentence is parallel because the verbs finished and submitted are both in simple past tense.)