When talking about an object pronoun, it does not mean you are referring to a subject; there is a big difference between a subject and an objective verb. Mostly the sentence is affected by an object. However, understanding the concept may be quite tricky. However, we encounter many object pronouns in a day.
Object pronouns are very crucial in any grammar writing in everyday life. Therefore it is essential to understand the pronouns so that it can easy to understand the written language easily.