In your SAT Writing prep, you’ve probably learned the Big 2: Verbs & Pronouns. Problems with verbs and pronouns account for almost 50% of the errors you’ll find when Improving Sentences and Identifying Errors. So why, then, is the preposition important? Just think of it as your inside man, giving you all the details on the verbs, nouns, and pronouns surrounding him.
What is a preposition? Prepositions are those little words in sentences like “on”, “in”, “for”, “of”, and “between”. They show the relationship of a noun or pronoun to another word, usually indicating time, location, or movement, and they can give you vital information on Subject-Verb Agreement and Pronoun Case.
Let’s look at Subject-Verb Agreement first. Singular subjects need to be paired with singular verbs. Plural subjects need to be paired with plural verbs. Sounds simple, right? Unfortunately, the SAT likes to confuse matters, tricking you with false subjects. They do this by using prepositional phrases, descriptive phrases that start with a preposition. Let’s look at an Improving Sentences example, remembering the simple rule that a sentence’s subject cannot follow a preposition:
The details of the recipe for the delicious dessert was a secret passed down through generations.
What’s the subject of this sentence? The SAT wants you to think it’s “dessert”. “Dessert” is singular, and “was” is singular. All good, right? But we have a few prepositions in our way: “of” and “for”. Since the subject cannot follow a preposition, remove the prepositional phrases “of the recipe” and “for the delicious dessert”. Once you’ve taken those out, re-read the sentence. “The details was a secret…” Our true subject is “details”, which is plural, so we need to change “was” to “were”.
Prepositions can help with more than Subject-Verb Agreement – they can tell us whether to use a subject pronoun (I, you, he/she/it, we, they, who) or an object pronoun (me, you, her/him/it, us, them, whom). How can prepositions help? Here’s the rule: if a pronoun follows a preposition, it must be in the object case. One common preposition used to trick you on the SAT is “between”, which is demonstrated in this Identifying Errors example:
He claims to have paid (A) the contractor on time, but, between you and I (B), this is hardly (C) the first time he has gotten embroiled (D) in a dispute. No error (E)
This might seem like a “No error” problem, but let’s take a closer look. When a grouping of pronouns is underlined, like “you and I”, immediately check to see if they are in the proper case. “Between”, a preposition, comes before “you and I”, so any pronoun that follows must be in object case. “You” can be object or subject case, so it’s ok. However, “I” is a subject pronoun. We’ve found our error:
(B)! (While we don’t need to correct the error here, had this been an Improving Sentences question, you would change the phrase to read “between you and me”.)
Subject-Verb Agreement and Pronoun Case are two big ways that one little word, the preposition, can help you avoid the SAT’s tricks and traps.
Lia O’Neale is a world-traveling, soccer-loving, Revolution Prep tutor and instructor. She’s a UC Berkeley graduate, who studied at Queen Mary College her junior year. She’s taught in China, walked in the footsteps of Dickens in London, held a penguin in New Zealand, and run from a crocodile in Australia.


