This section is from the book "Lessons In English", by Chestine Gowdy, Lora M. Dexheimer. Also available from Amazon: Lessons in English.
Two elements that are used exactly alike in a sentence are said to be of the same rank.
Two subjects of the same predicate, two predicates of the same subject, or two objects of the same verb are of the same rank. Two adjuncts, in order to be of the same rank, not only must be added to the same word, but they must express the same sort of idea; for example, quality, place, time, purpose, or cause. They should be of the same form also; that is, both should be words, phrases, or clauses.
 
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