SV agreement, subjects containing clauses - sing.

When a sentence contains a relative clause (the part that begins with that, which, or who), the main verb still agrees with the head noun-the noun the clause describes-not with a noun inside the clause. Mistakes happen when writers match the verb to a nearer noun inside the clause instead of to the head noun.

Below: a short rule, focused explanations, many clear wrong/right pairs, workplace/school/casual examples, and three ready-to-use rewrites to practice.

Quick answer

Match the verb to the head noun the relative clause modifies. If the head noun is singular, use a singular verb; if it's plural, use a plural verb.

The book that she gives me is interesting. (book → singular → is)
The books that she gives me are interesting. (books → plural → are)
Avoid proximity errors: don't let a nearer plural noun inside the clause pull the verb away from the head noun.

Why the head noun controls the verb

A relative clause (that/which/who + clause) provides extra information about the head noun but does not change its number. The head noun determines verb number because it is the sentence's grammatical subject for agreement purposes.

Common traps:

Proximity confusion: a plural noun inside the clause (e.g., "students") can seem to require a plural verb even when the head noun is singular.
Partitive phrases: "some of the cake" vs. "some of the cakes" depend on whether you mean a mass or multiple items.
Collective nouns: decide whether the group acts as a unit (singular) or as individuals (plural), and be consistent with your variety of English.

Quick checks: remove the relative clause and read the shortened sentence ("The X is/are...") or rewrite as two sentences to confirm the correct verb.

Real usage: work, school, and casual examples

See how the rule applies in everyday settings. Each correct sentence follows the head-noun test.

Work - Wrong: The report that the managers approve are ready.
Right: The report that the managers approve is ready.
Work - Wrong: The policies that the board issued needs updating.
Right: The policies that the board issued need updating.
Work - Wrong: The team that we hired is taking their desks. Right (unit): The team that we hired is taking its new desks. Right (individuals): The team that we hired are taking their desks.
School - Wrong: The assignment that the students turned in was messy.
Right: The assignment that the students turned in was messy. (assignment = singular)
School - Wrong: The essays that the class submitted needs review.
Right: The essays that the class submitted need review.
School - Wrong: Some of the homework have disappeared.
Right: Some of the homework has disappeared. (homework = mass)
Casual - Wrong: The playlist that my friends made is full of new songs.
Right: The playlist that my friends made is full of new songs.
Casual - Wrong: The pictures that you took looks great.
Right: The pictures that you took look great.
Casual - Wrong: Some of the cookies has been eaten.
Right: Some of the cookies have been eaten.

Wrong vs right examples you can copy

Use these pairs to train your eye. Each "Wrong" example shows the proximity or partitive error; each "Right" one fixes it by matching the verb to the head noun.

Wrong: The book that she gives me are interesting.
Right: The book that she gives me is interesting.
Wrong: The books that she gives me is interesting.
Right: The books that she gives me are interesting.
Wrong: Some of the cake have been eaten.
Right: Some of the cake has been eaten. (cake = mass)
Wrong: Some of the cakes has been eaten.
Right: Some of the cakes have been eaten. (cakes = count)
Wrong: The team that play well is winning. Right (individuals): The team that play well are winning. Right (unit): The team that plays well is winning.
Wrong: The list of items are on the table.
Right: The list of items is on the table. (list = head noun)

How to fix your own sentence

Fixing these errors takes three quick steps you can apply to any sentence.

Step 1: Identify the head noun (the noun before the relative clause).
Step 2: Remove the relative clause and read the short sentence to check number: "The X is/are...".
Step 3: If needed, rewrite into two sentences or choose a clearer structure.

Three ready rewrites:

Original: This plan that the team suggested are risky.
Rewrite: This plan that the team suggested is risky.
Original: The problems that the students listed requires attention.
Rewrite: The problems that the students listed require attention.
Original: Is that the book that you want are on sale?
Rewrite: Is that the book that you want on sale?

A simple memory trick

Picture the head noun plus the verb as a unit. If the noun is one item, say "is"; if multiple, say "are."

Delete the relative clause to hear the correct agreement: "The X is/are..."
When you edit, search drafts for patterns like "that + plural noun + singular verb" or vice versa and fix in bulk.

Similar mistakes and spacing/hyphenation notes

Writers who mix up relative-clause agreement often make nearby errors too. Look for split words, wrong hyphenation, and verb-form confusion while you edit.

Split words or odd spacing: check whether a compound is normally closed, hyphenated, or spaced.
Hyphenation: compounds can change part of speech; hyphens rarely affect subject-verb agreement but do affect readability.
Grammar forms: watch for proximity errors, misplaced modifiers, and incorrect verb forms in inverted sentences.

FAQ

Should I write "the book that she gives me is" or "are"?

Use "is." The head noun book is singular, so the verb must be singular, regardless of plural nouns inside the relative clause.

What if the relative clause contains a plural noun near the verb?

Ignore proximity. Match the verb to the head noun. If proximity still confuses you, rewrite: "She gives me a book. The book is interesting."

How do I handle collective nouns (team, committee, staff)?

Decide whether the group acts as one unit (use singular) or as individuals (use plural). Be consistent with your variety of English-US tends to prefer singular verbs; UK often accepts plural when individuals are emphasized.

Which is correct: "Some of the cake is gone" or "Some of the cake are gone"?

"Some of the cake is gone" treats cake as a single mass and is correct. Use "are" only if you mean multiple cakes: "Some of the cakes are gone."

Can a grammar checker always fix these errors?

Good tools catch many proximity errors and offer suggestions, but they may propose multiple options. Use the head-noun test to choose the right suggestion.

Quick habit to avoid these errors

Before you send or submit, delete any relative clause and read the short sentence: "The X is/are ..." If that sounds right, the agreement is correct. When unsure, rewrite into two short sentences or change the head noun so the intended number is clear.