Why do phrases like "of crayons" confuse students?

Because the nearest noun to the verb wins by instinct, and it's the wrong one. In "The box of crayons was full," the subject is box. Teach students to bracket the prepositional phrase and match the verb to what's left. Our 4th grade items are built around exactly this trap.

How is this tested on state assessments?

Usually like the test-style sheet here: a sentence with a blank and two or three verb choices. The reasoning they need is the same routine as the worksheet: find the subject, decide one-or-many, write the verb that matches.

4th grade subject-verb agreement

4th grade subject-verb agreement worksheets

By 4th grade, agreement questions hide the subject: collective nouns (the team practices) and subjects separated from the verb (the box of crayons was full). The skill is finding the true subject first, then matching the verb to it.

Free printable PDF worksheet, aligned to Common Core L.3.1.f.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of sentences you'll fix

Write the form of the verb in parentheses that agrees with the subject. Use the present tense unless the sentence says it already happened.

On our last trip, the suitcases (be) too heavy for one person.
Fixed: On our last trip, the suitcases were too heavy for one person.
The swarm of bees (return) to the hive at dusk.
The kittens (have) tiny white paws.

Every print pulls a new set of sentences at this level, so a make-up test or a second sibling gets a different mix.

What's on a 4th grade sheet

4th grade sheets draw from 60 sentences, 8 to a page. 25 of the 60 aren't on 3rd grade sheets. The other 35 are.

A few of the sentences, as the answer key corrects them:

My cousins have a treehouse in their backyard.
The clouds above the harbor look heavy with rain.
The recipe for these dumplings calls for fresh ginger.

Fix it. Write the form of the verb in parentheses that agrees with the subject. Use the present tense unless the sentence says it already happened. 8 sentences to fix per page.
Choose the word. Circle the letter of the verb that agrees with the subject. 10 questions per page.

Every version prints on US Letter or A4, with its answer key on the last page.

How to teach this

Teach subject-hunting explicitly. In "The box of crayons (was/were) on the shelf," have students cross out the prepositional phrase "of crayons" first; what's left is the subject. Collective nouns (team, class, family) act singular in standard American usage, which is worth stating plainly rather than leaving to intuition.

Watch for: The s moves: singular nouns usually have no s while their verb does (the dog barks), and plural nouns have the s while their verb doesn't (the dogs bark). Words between the subject and the verb don't change the match. In 'The box of crayons was full', the subject is box, not crayons.

Common questions about 4th grade subject-verb agreement

Why do phrases like "of crayons" confuse students?: Because the nearest noun to the verb wins by instinct, and it's the wrong one. In "The box of crayons was full," the subject is box. Teach students to bracket the prepositional phrase and match the verb to what's left. Our 4th grade items are built around exactly this trap.
How is this tested on state assessments?: Usually like the test-style sheet here: a sentence with a blank and two or three verb choices. The reasoning they need is the same routine as the worksheet: find the subject, decide one-or-many, write the verb that matches.

Related worksheets

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Aligned to Common Core L.3.1.f. Reviewed by the One more sheet team. Content version 241, updated October 2026.

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