Oh, pronouns. They are so simple, and yet can be so tricky, especially pronouns on the SAT. Even if you haven’t had a grammar lesson in years, you probably remember what a pronoun is, but just in case, let’s refresh.Pronouns replace nouns in our writing and help us avoid repetition of the same nouns over and over. Nouns themselves are versatile and can be used in different ways. As a result, there are many types of pronouns, each with its own purpose.