Parallelism is a grammatical construction in which similar words, phrases, or clauses are used in parallel form. It creates a sense of balance and rhythm in writing and can be used to emphasize ideas or create contrast.
To check parallelism, you need to identify the elements in your sentence that are parallel. These elements can be words, phrases, or clauses. Once you have identified the parallel elements, you need to make sure that they are all in the same grammatical form. This means that they should have the same tense, voice, and mood.