Lesson 3
Subject–Verb Agreement: Number Expressions and Add-on Phrases
This lesson groups five rules that students commonly confuse because they look similar on the surface. Find the true subject before looking at the verb. Work through the examples slowly once; speed comes after the pattern is clear.
What you will learn
- Understand and apply: 'A number of' is plural; 'the number of' is singular.
- Understand and apply: 'Many a' takes a singular noun and verb.
- Understand and apply: 'More than one' usually takes a singular verb.
- Understand and apply: 'As well as/together with' do not create a plural subject.
- Understand and apply: Collective nouns can be singular when acting as one unit.
For every rule: spot the trigger → identify the grammatical relationship → apply the form → check meaning.
Before you start
Try the warm-up without checking the rule. The purpose is to expose the instinct you currently use, not to score marks.
Which sentence follows the target grammar pattern?
A. A number of students are revising, but the number of absentees is small.
B. A number of students is revising, but the number of absentees are small.
Answer: A. A number of means several and takes a plural verb; the number of refers to one total and takes a singular verb.
Rule 1 · G011
'A number of' is plural; 'the number of' is singular
A number of means several and takes a plural verb; the number of refers to one total and takes a singular verb.
Correct example
A number of students are revising, but the number of absentees is small.
Incorrect example
A number of students is revising, but the number of absentees are small.
Interpretation
A number of means several and takes a plural verb; the number of refers to one total and takes a singular verb. In a test, do not memorise this as an isolated sentence. Find the true subject before looking at the verb. The correct example shows the pattern in context; compare it directly with the incorrect version and identify the exact word that must change.
Why it matters
Agreement errors are easy to hide inside long CAT/XAT-style sentences because the true subject may be far from the verb.
Common exam trap
The examiner places a plural noun closer to the verb than the actual singular subject, or vice versa.
How to spot it
Box the finite verb, then ask which noun actually controls it. Ignore nearby nouns that belong inside phrases.
3-step solving method
- Find the finite verb.
- Find its true subject, ignoring embedded phrases.
- Match singular/plural number.
Why the incorrect example fails
The target structure requires this rule: A number of means several and takes a plural verb; the number of refers to one total and takes a singular verb. In the incorrect version, the repair is to replace “is” with “are”; replace “are” with “is”. That is the exact edit a student should be able to justify in an error-spotting question.
Nuance and memory hook
If the sentence has a long phrase between subject and verb, temporarily cross that phrase out and test the shorter sentence.
A number of = several; the number of = one total.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “A number of students is revising, but the number of absentees are small.”
Reveal quick check answer
Apply 'A number of' is plural; 'the number of' is singular: A number of means several and takes a plural verb; the number of refers to one total and takes a singular verb.
Practice questions
Apply the rule in context
Which sentence is the better choice in standard exam-oriented English?
Explain the error rather than guessing by sound
Why is this sentence problematic in the target rule? “A number of students is revising, but the number of absentees are small.”
Rule 2 · G012
'Many a' takes a singular noun and verb
Many a is followed by a singular noun and usually takes a singular verb despite its plural meaning.
Correct example
Many a student has lost marks through haste.
Incorrect example
Many a student have lost marks through haste.
Interpretation
Many a is followed by a singular noun and usually takes a singular verb despite its plural meaning. In a test, do not memorise this as an isolated sentence. Find the true subject before looking at the verb. The correct example shows the pattern in context; compare it directly with the incorrect version and identify the exact word that must change.
Why it matters
Agreement errors are easy to hide inside long CAT/XAT-style sentences because the true subject may be far from the verb.
Common exam trap
The examiner places a plural noun closer to the verb than the actual singular subject, or vice versa.
How to spot it
Box the finite verb, then ask which noun actually controls it. Ignore nearby nouns that belong inside phrases.
3-step solving method
- Find the finite verb.
- Find its true subject, ignoring embedded phrases.
- Match singular/plural number.
Why the incorrect example fails
The target structure requires this rule: Many a is followed by a singular noun and usually takes a singular verb despite its plural meaning. In the incorrect version, the repair is to replace “have” with “has”. That is the exact edit a student should be able to justify in an error-spotting question.
Nuance and memory hook
If the sentence has a long phrase between subject and verb, temporarily cross that phrase out and test the shorter sentence.
Many = count; much = mass.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “Many a student have lost marks through haste.”
Reveal quick check answer
Apply 'Many a' takes a singular noun and verb: Many a is followed by a singular noun and usually takes a singular verb despite its plural meaning.
Practice questions
Apply the rule in context
Which sentence is the better choice in standard exam-oriented English?
Explain the error rather than guessing by sound
Why is this sentence problematic in the target rule? “Many a student have lost marks through haste.”
Rule 3 · G013
'More than one' usually takes a singular verb
The expression more than one is conventionally followed by a singular noun and singular verb.
Correct example
More than one explanation seems plausible.
Incorrect example
More than one explanations seem plausible.
Interpretation
The expression more than one is conventionally followed by a singular noun and singular verb. In a test, do not memorise this as an isolated sentence. Find the true subject before looking at the verb. The correct example shows the pattern in context; compare it directly with the incorrect version and identify the exact word that must change.
Why it matters
Agreement errors are easy to hide inside long CAT/XAT-style sentences because the true subject may be far from the verb.
Common exam trap
The examiner places a plural noun closer to the verb than the actual singular subject, or vice versa.
How to spot it
Box the finite verb, then ask which noun actually controls it. Ignore nearby nouns that belong inside phrases.
3-step solving method
- Find the finite verb.
- Find its true subject, ignoring embedded phrases.
- Match singular/plural number.
Why the incorrect example fails
The target structure requires this rule: The expression more than one is conventionally followed by a singular noun and singular verb. In the incorrect version, the repair is to replace “explanations seem” with “explanation seems”. That is the exact edit a student should be able to justify in an error-spotting question.
Nuance and memory hook
If the sentence has a long phrase between subject and verb, temporarily cross that phrase out and test the shorter sentence.
The expression more than one is conventionally followed by a singular noun and singular verb.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “More than one explanations seem plausible.”
Reveal quick check answer
Apply 'More than one' usually takes a singular verb: The expression more than one is conventionally followed by a singular noun and singular verb.
Practice questions
Apply the rule in context
Which sentence is the better choice in standard exam-oriented English?
Explain the error rather than guessing by sound
Why is this sentence problematic in the target rule? “More than one explanations seem plausible.”
Rule 4 · G014
'As well as/together with' do not create a plural subject
Phrases such as as well as, along with and together with do not change the number of the main subject.
Correct example
The coach, along with two mentors, is attending the session.
Incorrect example
The coach, along with two mentors, are attending the session.
Interpretation
Phrases such as as well as, along with and together with do not change the number of the main subject. In a test, do not memorise this as an isolated sentence. Find the true subject before looking at the verb. The correct example shows the pattern in context; compare it directly with the incorrect version and identify the exact word that must change.
Why it matters
Agreement errors are easy to hide inside long CAT/XAT-style sentences because the true subject may be far from the verb.
Common exam trap
The examiner places a plural noun closer to the verb than the actual singular subject, or vice versa.
How to spot it
Box the finite verb, then ask which noun actually controls it. Ignore nearby nouns that belong inside phrases.
3-step solving method
- Find the finite verb.
- Find its true subject, ignoring embedded phrases.
- Match singular/plural number.
Why the incorrect example fails
The target structure requires this rule: Phrases such as as well as, along with and together with do not change the number of the main subject. In the incorrect version, the repair is to replace “are” with “is”. That is the exact edit a student should be able to justify in an error-spotting question.
Nuance and memory hook
If the sentence has a long phrase between subject and verb, temporarily cross that phrase out and test the shorter sentence.
Add-on phrases add information, not another grammatical subject.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “The coach, along with two mentors, are attending the session.”
Reveal quick check answer
Apply 'As well as/together with' do not create a plural subject: Phrases such as as well as, along with and together with do not change the number of the main subject.
Practice questions
Apply the rule in context
Which sentence is the better choice in standard exam-oriented English?
Explain the error rather than guessing by sound
Why is this sentence problematic in the target rule? “The coach, along with two mentors, are attending the session.”
Rule 5 · G015
Collective nouns can be singular when acting as one unit
When a group acts as a single unit, a collective noun commonly takes a singular verb.
Correct example
The committee has approved the final schedule.
Incorrect example
The committee have approved the final schedule.
Interpretation
When a group acts as a single unit, a collective noun commonly takes a singular verb. In a test, do not memorise this as an isolated sentence. Find the true subject before looking at the verb. The correct example shows the pattern in context; compare it directly with the incorrect version and identify the exact word that must change.
Why it matters
Agreement errors are easy to hide inside long CAT/XAT-style sentences because the true subject may be far from the verb.
Common exam trap
The examiner places a plural noun closer to the verb than the actual singular subject, or vice versa.
How to spot it
Box the finite verb, then ask which noun actually controls it. Ignore nearby nouns that belong inside phrases.
3-step solving method
- Find the finite verb.
- Find its true subject, ignoring embedded phrases.
- Match singular/plural number.
Why the incorrect example fails
The target structure requires this rule: When a group acts as a single unit, a collective noun commonly takes a singular verb. In the incorrect version, the repair is to replace “have” with “has”. That is the exact edit a student should be able to justify in an error-spotting question.
Nuance and memory hook
British English can use plural agreement when a collective noun emphasises individual members (e.g., 'the team are arguing'). In exam-style edited prose, use the meaning of the sentence and stay internally consistent.
When a group acts as a single unit, a collective noun commonly takes a singular verb.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “The committee have approved the final schedule.”
Reveal quick check answer
Apply Collective nouns can be singular when acting as one unit: When a group acts as a single unit, a collective noun commonly takes a singular verb.
Practice questions
Apply the rule in context
Which sentence is the better choice in standard exam-oriented English?
Explain the error rather than guessing by sound