Things to look out for when making a sentence with parallel structure include:
Active v. passive voice, infinitive v. other
verb forms, list of individual modifiers v.
longer phrases, sentences about sharks.
Active v. passive voice, infinitive v. other
verb forms, list of individual modifiers v.
longer phrases.
Active v. passive voice, infinitive v. other
verb forms, list of individual modifiers v.
longer phrases, run-on sentences.

In the"Mending Wall" by Robert Frost, the speaker mains skeptical towards the action taken by the neighbors, who decide to repair a wall that separates them. In the end, he understands the meaning behind this periodic maintenance of the wall when one of the neighbors tells him: "Good fences make good neighbors". The speaker learns that it is this periodical practice that keeps the neighbors in touch and in good terms.

This poem defers from Frost's attitude towards writing, as it is not structured in stanzas. It is rather a simple narrative from a person in 45 lines.