Identify two ideas that are similar and have an equal level of importance. The two ideas can be at the word level, phrase level or clause level. For example, in Psalm 139, David uses parallelism to describe the omniscience of God: "You discern my going out and my lying down, you are familiar with all my ways." (Psalms 139:3). David uses the same idea twice in the sentence to emphasize the idea that God knows about David's every action.
Add a coordinating conjunction to connect the ideas together. In a simple sentence, this can be a conjunction such as "and" or "or."
Retain the grammatical form of the words when making a list during the speech. For example, "The hard work, the dedication, the talent which we bring to the field will bring this city a championship." In this example, the word "the" is retained for each item in the list.
This technique can also be used to clarify meaning: "Terry researches cell membranes and cell walls." In this example, retaining the word "cell" clarifies the meaning of the sentence with parallelism.
Maintain the same grammatical structure of the connected clauses in a complex sentence. In complex sentences, vary the exact wording of each clause, while maintaining the same structure throughout. Francis Bacon did this in his book "On Studies": "Reading maketh a man full, conference a man ready, and writing an exact man."