Lesson 1
Subject–Verb Agreement: Singular, Plural and Compound Subjects
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: Singular subjects take singular present-tense verbs.
- Understand and apply: Plural subjects take plural present-tense verbs.
- Understand and apply: Ignore intervening prepositional phrases.
- Understand and apply: Subjects joined by 'and' are usually plural.
- Understand and apply: 'And' can be singular when it names 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. The analyst checks every assumption before submitting the report.
B. The analyst check every assumption before submitting the report.
Answer: A. A singular third-person subject normally takes a verb ending in -s or -es in the simple present.
Rule 1 · G001
Singular subjects take singular present-tense verbs
A singular third-person subject normally takes a verb ending in -s or -es in the simple present.
Correct example
The analyst checks every assumption before submitting the report.
Incorrect example
The analyst check every assumption before submitting the report.
Interpretation
A singular third-person subject normally takes a verb ending in -s or -es in the simple present. 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 singular third-person subject normally takes a verb ending in -s or -es in the simple present. In the incorrect version, the repair is to replace “check” with “checks”. 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 singular third-person subject normally takes a verb ending in -s or -es in the simple present.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “The analyst check every assumption before submitting the report.”
Reveal quick check answer
Apply Singular subjects take singular present-tense verbs: A singular third-person subject normally takes a verb ending in -s or -es in the simple present.
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 analyst check every assumption before submitting the report.”
Rule 2 · G002
Plural subjects take plural present-tense verbs
Plural subjects normally take the base form of the verb in the simple present.
Correct example
The analysts check every assumption before submitting the report.
Incorrect example
The analysts checks every assumption before submitting the report.
Interpretation
Plural subjects normally take the base form of the verb in the simple present. 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: Plural subjects normally take the base form of the verb in the simple present. In the incorrect version, the repair is to replace “checks” with “check”. 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.
Plural subjects normally take the base form of the verb in the simple present.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “The analysts checks every assumption before submitting the report.”
Reveal quick check answer
Apply Plural subjects take plural present-tense verbs: Plural subjects normally take the base form of the verb in the simple present.
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 analysts checks every assumption before submitting the report.”
Rule 3 · G003
Ignore intervening prepositional phrases
Make the verb agree with the true subject, not with a noun inside an intervening phrase.
Correct example
The quality of the arguments matters more than their number.
Incorrect example
The quality of the arguments matter more than their number.
Interpretation
Make the verb agree with the true subject, not with a noun inside an intervening phrase. 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: Make the verb agree with the true subject, not with a noun inside an intervening phrase. In the incorrect version, the repair is to replace “matter” with “matters”. 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 noun inside an 'of/with/in' phrase is usually a distractor; return to the head noun.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “The quality of the arguments matter more than their number.”
Reveal quick check answer
Apply Ignore intervening prepositional phrases: Make the verb agree with the true subject, not with a noun inside an intervening phrase.
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 quality of the arguments matter more than their number.”
Rule 4 · G004
Subjects joined by 'and' are usually plural
Two distinct subjects joined by and normally take a plural verb.
Correct example
Accuracy and speed improve with deliberate practice.
Incorrect example
Accuracy and speed improves with deliberate practice.
Interpretation
Two distinct subjects joined by and normally take a plural 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: Two distinct subjects joined by and normally take a plural verb. In the incorrect version, the repair is to replace “improves” with “improve”. 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.
BY = deadline; UNTIL = continuation.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “Accuracy and speed improves with deliberate practice.”
Reveal quick check answer
Apply Subjects joined by 'and' are usually plural: Two distinct subjects joined by and normally take a plural 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? “Accuracy and speed improves with deliberate practice.”
Rule 5 · G005
'And' can be singular when it names one unit
A compound expression treated as one idea, dish, title or unit may take a singular verb.
Correct example
Bread and butter is my usual breakfast.
Incorrect example
Bread and butter are my usual breakfast.
Interpretation
A compound expression treated as one idea, dish, title or unit may take 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 compound expression treated as one idea, dish, title or unit may take a singular verb. 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.
A compound expression treated as one idea, dish, title or unit may take a singular verb.
Quick check
Without relying on what 'sounds right', explain which part of this sentence violates the rule: “Bread and butter are my usual breakfast.”
Reveal quick check answer
Apply 'And' can be singular when it names one unit: A compound expression treated as one idea, dish, title or unit may take 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