Parallelism in grammar occurs when there is a similarity of structures used in sentence construction. The usage of parallelism in your writing makes the information you are presenting easier to process for your readers.
Inappropriate parallelism, on the other hand, disturbs the flow of thoughts when reading a piece of writing.
When two or more parts of a sentence are similar in meaning but different in form, a faulty parallelism can be said to have occurred.
Let us take a look at the following examples;
Ali is swimming, driving, running and to dance.
The above sentence sounds odd, doesn’t it? Now check out the sentence below.
Ali is swimming, eating, running and dancing.
The above sentence sounds a whole lot better, doesn’t it? Now, here is what happened.
In the first sentence, the verbs are all in the present continuous form except the last one ‘to dance’ which is in the infinitive form while the verbs in the second sentence are all in the present continuous form.
Be mindful of this when you write.