Recognize pronoun agreement and pronoun case errors - TACHS Written Expression

SECTION 1

Why Pronouns Matter: A Brief History

Imagine if every time you talked about your friend Maria, you had to say "Maria" over and over again. That would get pretty annoying, right? That is exactly why pronouns (words like she, he, they, it) were invented. They are handy shortcut words that replace nouns. But pronouns come with rules, and when those rules are broken, sentences get confusing.

English has changed a lot over the centuries. The rules for pronouns have shifted as the language grew. Let's look at a quick timeline of how pronoun rules developed.

~450 • Old English Emerges

Old English had many more pronoun forms than we use today. Pronouns changed based on their role in a sentence, much like in Latin or German.

~1100 • Middle English Simplifies

After the Norman Conquest, English started dropping some pronoun forms. The language became simpler, but pronoun case (subject vs. object) still mattered.

~1700 • Grammar Books Appear

Scholars wrote the first English grammar textbooks. They set clear rules for pronoun agreement and case that are still taught today.

2000s • Standardized Tests Focus on Pronouns

Tests like the TACHS check whether students can spot pronoun errors. Knowing these rules helps you write clearly and score well on exams.

So here is the big question this lesson answers: How do you spot a pronoun that doesn't match its noun or is in the wrong form? Let's find out.

SECTION 2

Core Principles: Agreement & Case

There are two main kinds of pronoun errors you need to watch for. The first is pronoun agreement (making sure a pronoun matches its antecedent—the noun it replaces—in number and gender). The second is pronoun case (using the right form of a pronoun based on its job in the sentence).

Pronoun Agreement

A pronoun must match its antecedent in number (singular or plural) and gender (he, she, they, it).

Antecedent

The antecedent is the noun that a pronoun refers back to. In "Sarah grabbed her bag," Sarah is the antecedent of her.

Subject Case

Use subject pronouns (I, he, she, we, they) when the pronoun is doing the action. Example: She runs fast.

Object Case

Use object pronouns (me, him, her, us, them) when the pronoun receives the action. Example: The coach helped him.

Possessive Case

Use possessive pronouns (my, his, her, our, their, its) to show ownership. Example: That is their house.

✦

KEY TAKEAWAY

Think of a pronoun like a name tag at a party. Agreement means the name tag matches the right person (singular person gets a singular tag). Case means the name tag is worn in the right spot—on your shirt (subject), on your backpack (object), or on your locker (possessive). Wrong spot, wrong form!

SECTION 3

Seeing Pronoun Case at a Glance

The diagram below shows the three pronoun cases side by side. Notice how each pronoun changes form depending on whether it is used as a subject, an object, or a possessive.

This chart shows every personal pronoun organized by case. Use the subject column when the pronoun does the action, the object column when it receives the action, and the possessive column when it shows ownership.

Keep this chart in mind as you work through sentences. When you see a pronoun in a test question, ask yourself: Is this pronoun doing the action, receiving the action, or showing ownership? Then check whether the correct form was used.

SECTION 4

How Pronoun Agreement Works

Pronoun agreement means a pronoun must match its antecedent in number and gender. If the antecedent is singular, the pronoun must be singular. If the antecedent is plural, the pronoun must be plural. Let's break down the most common agreement traps.

Trap 1: Indefinite Pronouns

Words like everyone, everybody, someone, somebody, anyone, anybody, each, either, neither, nobody are all singular. Even though "everyone" sounds like a lot of people, grammar treats it as one person at a time.

⚠

Common Mistake

Wrong: Everyone should bring their lunch. ("Everyone" is singular, but "their" is plural.) Correct on the TACHS: Everyone should bring his or her lunch.

Trap 2: Compound Antecedents

When two nouns are joined by "and," the antecedent is plural. Use a plural pronoun. Example: Tom and Jerry finished their project. But when two nouns are joined by "or" or "nor," the pronoun matches the noun closest to it. Example: Neither the boys nor Maria brought her book.

Trap 3: Collective Nouns

Words like team, class, family, group are usually treated as singular when the group acts as one unit. Example: The team celebrated its victory. (Not "their victory," because the team is acting together as one.)

This flowchart walks you through the steps to check pronoun agreement. Start at the top, find your antecedent, check if it's singular or plural, then choose the matching pronoun.

SECTION 5

Pronoun Case: Choosing the Right Form

Pronoun case is all about a pronoun's job in the sentence. Is it the doer? The receiver? The owner? The three cases are subject, object, and possessive. Here is a closer look at the trickiest situations.

Trick 1: Pronouns After "Than" or "As"

When you see a pronoun after "than" or "as," mentally finish the sentence. She is taller than I [am]. You would not say "me am," so "I" is correct here.

Trick 2: Pronouns in Compound Subjects or Objects

When a pronoun is paired with another noun, remove the other person and test the pronoun alone. Jake and [I/me] went to the store. Drop "Jake and"—would you say "Me went to the store"? No! So it must be "I."

Trick 3: Who vs. Whom

Who is a subject pronoun (like "he"). Whom is an object pronoun (like "him"). Quick test: if you can answer the question with "him," use "whom." Whom did you call? I called him. It fits, so "whom" is correct.

Situation	Wrong	Right	Why
Compound subject	Me and Luis ran.	Luis and I ran.	Subject pronoun needed
Compound object	Give it to she and I.	Give it to her and me.	Object pronoun after "to"
After than/as	He is faster than me.	He is faster than I.	Complete: "than I am"
Who vs. whom	Who did you see?	Whom did you see?	Object of "see" (saw him)
Possessive vs. contraction	The dog wagged it's tail.	The dog wagged its tail.	"Its" = possessive; "it's" = it is

Common pronoun case errors and corrections

SECTION 6

Worked Example: Spotting the Error

Let's walk through a TACHS-style question step by step. Read the sentence below and find the pronoun error.

ℹ

Sample Sentence

Each of the girls on the soccer team packed their own water bottle for the game.

Finding and Fixing the Pronoun Error

1
Step 1 — Find the pronoun

Look through the sentence for any pronouns. We can spot "their" near the end of the sentence. This is our pronoun to examine.
2
Step 2 — Find the antecedent

What does "their" refer to? It refers to "Each" — not "girls" and not "team." The phrase "of the girls" is a prepositional phrase that describes "each" but does not change its number.
3
Step 3 — Check agreement

Is "each" singular or plural? "Each" is always singular. It means "each one," one at a time. But "their" is a plural pronoun. That is a mismatch!

Error found: "their" (plural) does not agree with "each" (singular)
4
Step 4 — Fix the error

Replace the plural pronoun with a singular one. Since the sentence is about girls, we can use "her."

Corrected: "Each of the girls on the soccer team packed her own water bottle for the game."

💡

REMEMBER THIS TRICK

When you see words like "each," "every," "everyone," or "nobody," picture just ONE person standing alone. That one person needs a singular pronoun. Think of it like a spotlight on a single actor on stage — the pronoun should match that one person, not the whole crowd in the background.

SECTION 7

Agreement vs. Case: Side by Side

Students sometimes mix up agreement errors and case errors. They are different problems, and they require different fixes. Let's compare them clearly.

Feature	Agreement Error	Case Error
What it means	Pronoun doesn't match antecedent in number or gender	Wrong pronoun form for its job in the sentence
What to check	Is the antecedent singular or plural?	Is the pronoun a subject, object, or possessive?
Example of error	A student should raise their hand.	Her and I are friends.
Corrected	A student should raise his or her hand.	She and I are friends.
Quick test	Match the pronoun's number to the antecedent's number	Remove the other person and test the pronoun alone

Agreement errors vs. case errors

✦

KEY TAKEAWAY

On the TACHS, you might see both types of errors in the same test. Use two separate checks: first ask "Does the pronoun match its antecedent in number?" (agreement). Then ask "Is the pronoun in the right form for its job?" (case). Two checks, two chances to catch errors.

SECTION 8

Looking Ahead: Pronouns in Tougher Sentences

The skills you are learning now are the same ones used in high school and college writing. As sentences get longer and more complex, pronoun errors become harder to spot. Here is a preview of what lies ahead.

Skill Level	What You Learn Now (TACHS)	What Comes Next (High School & Beyond)
Agreement	Match pronouns with clear antecedents	Handle ambiguous or missing antecedents in complex paragraphs
Case	Subject vs. object in simple and compound structures	Pronoun case in appositives, gerund phrases, and infinitive phrases
Who/Whom	Basic who vs. whom in questions	Who vs. whom in embedded clauses ("the person whom I met")
Unclear reference	Identify the correct antecedent	Fix vague pronoun reference in essays and research papers

Pronoun skills: now vs. later

The good news? If you master agreement and case now, those advanced skills will feel like natural next steps. You are building a strong foundation that will serve you for years.

SECTION 9

Practice Problems

Try these five problems. For each sentence, find the pronoun error and explain why it is wrong. Then write the corrected version.

Question 1: CONCEPTUAL

Which of the following sentences has a pronoun agreement error? (A) The dog wagged its tail. (B) Nobody forgot their homework. (C) She finished her test early. (D) We brought our lunches.

Show answer

The answer is (B). "Nobody" is a singular indefinite pronoun, but "their" is plural. The correct sentence should be: "Nobody forgot his or her homework." Choices (A), (C), and (D) all have pronouns that correctly match their antecedents in number.

Question 2: BASIC CALCULATION

Find and correct the pronoun case error in this sentence: "My mom drove Maria and I to the mall."

Show answer

The error is "I." In this sentence, "Maria and I" is the object of the verb "drove." Use the drop-the-other-person test: you would not say "My mom drove I to the mall." You would say "My mom drove me." The correct sentence is: "My mom drove Maria and me to the mall." After a verb, you need an object pronoun (me), not a subject pronoun (I).

Question 3: INTERMEDIATE

Find and correct the error: "Each of the boys brought their favorite book to class, and the teacher asked they to share it with a partner."

Show answer

There are two errors. First, "their" should be "his" because the antecedent "each" is singular. Second, "they" should be "them" because it is the object of the verb "asked." The corrected sentence reads: "Each of the boys brought his favorite book to class, and the teacher asked them to share it with a partner." Always check both agreement and case when you see multiple pronouns in one sentence.

Question 4: APPLIED

Your classmate writes this sentence in an essay: "The debate team won first place at States, and they were proud of themselves, but everyone was most excited about their individual trophies." Is there an error? If so, identify and fix it.

Show answer

The first part is correct: "team" acts as a group, and "they" can refer to the team members. The error is in the last part. "Everyone" is singular, so "their" does not agree with it. The corrected sentence should end: "...but everyone was most excited about his or her individual trophy." Notice that "trophies" also changes to "trophy" because each person has one trophy. On the TACHS, always check indefinite pronouns like "everyone" carefully.

Question 5: CRITICAL THINKING

Read this paragraph and find all the pronoun errors. Then explain the rule behind each correction: "Neither the coach nor the players remembered to bring his water bottles. Tanya ran faster than him, so the team gave she the MVP award. Whom was the happiest person there? Everyone cheered for their favorite runner."

Show answer

There are four errors. (1) "his" should be "their" — with "neither...nor," the pronoun matches the nearer noun, "players" (plural), so use "their." (2) "him" should be "he" — after "than," complete the thought: "faster than he [ran]." Subject pronoun needed. (3) "she" should be "her" — "she" follows the verb "gave" as an indirect object, so it needs the object form "her." (4) "their" should be "his or her" — "everyone" is singular, so the pronoun must be singular too. Also, "Whom" should be "Who" because it is the subject of the sentence ("Who was the happiest?"). These corrections show agreement rules (errors 1 and 4) and case rules (errors 2, 3, and the who/whom issue).

SUMMARY

Lesson Summary

Summary

In this lesson, you learned two essential rules for pronouns. Pronoun agreement means a pronoun must match its antecedent in number (singular or plural) and gender. Watch out for tricky indefinite pronouns like everyone, someone, each, and nobody — they are all singular. Collective nouns (team, class, family) are usually singular too.

Pronoun case means choosing the right form based on the pronoun's job: subject pronouns (I, he, she, we, they) for doers, object pronouns (me, him, her, us, them) for receivers, and possessive pronouns (my, his, her, our, their) for ownership. Use the drop-the-other-person test for compound subjects and objects, and remember that who is a subject pronoun while whom is an object pronoun. Master these two checks and you will catch pronoun errors on the TACHS every time.