English Language Arts · 9th Grade · Grammar, Style, and the Power of Language · Weeks 28-36

Common Grammatical Errors

Identifying and correcting common grammatical errors such as subject-verb agreement, pronoun-antecedent agreement, and misplaced modifiers.

• Common Core State Standards
• CCSS.ELA-LITERACY.L.9-10.1.A
• CCSS.ELA-LITERACY.L.9-10.1.B

About This Topic

Grammatical errors slow readers down and, at their worst, obscure meaning entirely. The three errors covered here -- subject-verb agreement, pronoun-antecedent agreement, and misplaced modifiers -- are among the most common in student writing and also among the most teachable once students understand why they occur.

Subject-verb agreement errors most often happen when the subject and verb are separated by a long phrase, when collective nouns or indefinite pronouns are involved, or when sentences are inverted. Pronoun-antecedent errors arise when the antecedent is ambiguous or when proximity leads students to match the pronoun to the nearest noun rather than the actual referent. Misplaced modifiers are often the result of revising a sentence without reading the whole thing aloud.

Grammar instruction is most effective when tied to students' own writing rather than decontextualized exercises. Identifying errors in real sentences -- and in their own drafts -- activates the pattern-recognition and revision habits that transfer to future writing. Active workshop formats keep students engaged and make the correction process collaborative rather than corrective.

Key Questions

1. How does incorrect subject-verb agreement obscure the meaning of a sentence?
2. Analyze the impact of misplaced modifiers on sentence clarity.
3. Construct sentences that demonstrate correct pronoun-antecedent agreement.

Learning Objectives

• Identify and explain the cause of subject-verb agreement errors in complex sentences.
• Analyze the impact of misplaced modifiers on sentence clarity and meaning in professional writing samples.
• Construct grammatically correct sentences demonstrating accurate pronoun-antecedent agreement.
• Evaluate the effectiveness of sentence revision strategies for correcting common grammatical errors.

Before You Start

Parts of Speech

Why: Students need to identify nouns, verbs, and pronouns to understand how they function and agree within a sentence.

Sentence Structure Basics

Why: Understanding basic sentence components like subjects and predicates is essential for recognizing agreement and modifier placement issues.

Key Vocabulary

Subject-verb agreement	The grammatical rule requiring that a subject and its verb must agree in number; a singular subject takes a singular verb, and a plural subject takes a plural verb.
Pronoun-antecedent agreement	The grammatical rule that a pronoun must agree in number and gender with the noun or pronoun it refers to, known as its antecedent.
Misplaced modifier	A word, phrase, or clause that is improperly separated from the word it modifies or describes, leading to confusion or unintended meanings.
Collective noun	A noun that refers to a group of people or things as a single unit, such as 'team,' 'family,' or 'committee.'
Indefinite pronoun	A pronoun that refers to a non-specific person, place, thing, or idea, such as 'everyone,' 'something,' or 'nobody.'

Watch Out for These Misconceptions

Common Misconception

Grammatical errors are always obvious when proofreading.

What to Teach Instead

Writers often miss their own errors because the brain reads intended meaning rather than actual text. Reading aloud, reading backward sentence by sentence, and using checklists for specific error types are strategies that catch what silent proofreading misses -- skills peer review workshops help students practice.

Common Misconception

Collective nouns always take plural verbs.

What to Teach Instead

In American English, collective nouns like 'team,' 'committee,' and 'class' generally take singular verbs ('the team is ready'), unlike British English where plural usage is common. Context matters: when the group acts as a unit, use singular; when members act individually, plural is sometimes acceptable.

Common Misconception

Misplaced modifiers only affect long, complicated sentences.

What to Teach Instead

Short sentences are just as vulnerable. 'She almost drove her children to school every day' means something very different from 'She drove her children to school almost every day.' One-word modifiers like 'only,' 'almost,' and 'just' are frequent culprits even in simple sentences.

Active Learning Ideas

Think-Pair-Share: Error Detective

Give students five sentences with subject-verb agreement errors drawn from authentic student writing (anonymized). Individually, they identify the error and write the corrected version. Pairs compare and discuss any disagreements before the class discusses each sentence together.

15 min·Pairs

Workshop: Modifier Placement Scramble

Provide sentences with misplaced or dangling modifiers. Students work individually to identify the intended meaning, then rewrite the sentence so the modifier is correctly placed. Small groups compare their rewrites and discuss cases where multiple correct versions are possible.

20 min·Small Groups

Gallery Walk: Before and After Error Corrections

Post six 'before' sentences (with errors) and their corrected versions around the room. Students walk with a clipboard, writing a one-sentence explanation of the rule that applies to each correction. The class compiles explanations into a shared grammar reference sheet.

20 min·Small Groups

Workshop: Peer Grammar Review

Students exchange a recent draft and use a checklist to search specifically for subject-verb agreement, pronoun-antecedent, and modifier errors. Each reviewer marks potential errors with a question mark rather than correcting directly, leaving the writer to diagnose and fix. Writers then compare the reviewer's flags with their own re-reading.

25 min·Pairs

Real-World Connections

• Journalists at The New York Times must ensure precise subject-verb and pronoun-antecedent agreement to maintain credibility and avoid misrepresenting facts in their reporting.
• Technical writers for companies like Apple meticulously check for misplaced modifiers to ensure user manuals and product descriptions are clear, accurate, and easy to follow.
• Lawyers drafting legal documents, such as contracts or briefs, pay close attention to grammatical precision to prevent ambiguity that could lead to costly disputes or misinterpretations of intent.

Assessment Ideas

Quick Check

Present students with 5-7 sentences, each containing one common grammatical error (subject-verb agreement, pronoun-antecedent agreement, or misplaced modifier). Ask students to identify the error and rewrite the sentence correctly on a whiteboard or digital document.

Peer Assessment

Have students exchange a paragraph of their own writing. Instruct them to specifically look for and highlight instances of subject-verb agreement issues, unclear pronoun references, or misplaced modifiers, and then provide a brief written suggestion for correction.

Exit Ticket

Provide students with two sentences: one with a subject-verb agreement error and one with a misplaced modifier. Ask them to identify the error in each sentence and explain in one sentence why the correction is necessary for clarity.

Frequently Asked Questions

What causes subject-verb agreement errors in student writing?

The most common cause is distance between subject and verb. When a long prepositional phrase or relative clause falls between them, students often match the verb to the nearest noun instead of the actual subject. Compound subjects joined by 'or' and 'nor' cause additional confusion because the rule requires matching to the closer subject.

How can I help students catch misplaced modifiers in their own writing?

Reading sentences aloud helps, but the most reliable technique is to ask: what does the modifier directly follow, and does that placement match the intended meaning? Having students underline every modifier and draw an arrow to what it modifies makes the structural issue visible before the fix.

Why do students still use 'their' with singular antecedents?

Singular 'they' has been used in English for centuries and is now recognized by most style guides including MLA, APA, and the Chicago Manual of Style. For academic writing, the important thing is intentionality: students should use singular 'they' deliberately and with a clear antecedent, not accidentally because the pronoun agreement is unclear.

How does active learning make grammar instruction more effective?

Isolated grammar drills rarely transfer to writing because they lack context and stakes. Peer grammar workshops where students flag potential errors in each other's real drafts -- and then defend or revise their choices -- build the diagnostic habits that carry into independent editing. The discussion around disagreements is where the deepest learning happens.