Answer:
1. Parallel structure means using the same pattern of words to show that two or more ideas have the same level of importance. This can happen at the word, phrase, or clause level. The usual way to join parallel structures is with the use or.
2. A simple way to check for parallelism in your writing is to make sure you have paired nouns with nouns, verbs with verbs, prepositional phrases with prepositional phrases, and so on. Underline each element in a sentence and check that the corresponding element uses the same grammatical form.Parallel structure is when you use the same way of describing several things in a list - so non-parallel structure is when you use different ways.
3. Not always, but Maintaining parallel structure helps you avoid grammatically incorrect sentences and improves your writing style.
