Who Do Not or Does Not: Understanding the Nuances of Subject-Verb Agreement in English

In the English language, mastering the correct use of verbs is crucial for clear and effective communication. One common point of confusion for many speakers and writers revolves around the phrases "who do not" and "who does not." While they both serve to negate an action, their correct application hinges on a fundamental grammatical principle: subject-verb agreement. This article will delve into the specifics of when to use each phrase, providing detailed explanations and examples to help the average American reader navigate this grammatical territory with confidence.

The Heart of the Matter: Subject-Verb Agreement

At its core, subject-verb agreement dictates that a verb must match its subject in number. This means that a singular subject requires a singular verb, and a plural subject requires a plural verb. The pronoun "who" can be tricky because it can refer to either a single person or multiple people. Therefore, determining whether to use "do not" (which pairs with plural subjects) or "does not" (which pairs with singular subjects) depends entirely on the noun or pronoun that "who" is representing.

When to Use "Who Does Not"

The phrase "who does not" is used when "who" refers to a singular subject. This singular subject could be a single person, a singular noun representing a group acting as a single unit, or even a singular pronoun.

Key indicators that "who" is singular:

The antecedent (the word that "who" refers back to) is a singular noun or pronoun.
The context of the sentence implies a single individual.

Examples:

"The athlete who does not train consistently will likely not perform at their best." (Here, "who" refers to "the athlete," which is singular.)
"She is the only student who does not seem to understand the instructions." ( "who" refers to "the student," singular.)
"The manager is looking for an employee who does not mind working overtime." ("who" refers to "an employee," singular.)
"My neighbor, who is usually very friendly, does not wave back today." ("who" refers to "My neighbor," singular.)

When to Use "Who Do Not"

Conversely, the phrase "who do not" is employed when "who" refers to a plural subject. This plural subject could be a plural noun or a plural pronoun.

Key indicators that "who" is plural:

The antecedent of "who" is a plural noun or pronoun.
The context of the sentence clearly indicates multiple individuals.

Examples:

"The team members who do not participate in the discussions are often left behind." (Here, "who" refers to "The team members," which is plural.)
"There are several applicants who do not meet the minimum qualifications." ("who" refers to "several applicants," plural.)
"My friends, who do not live nearby, are planning a visit." ("who" refers to "My friends," plural.)
"The children who do not complete their homework will have to stay after school." ("who" refers to "The children," plural.)

A Word on Collective Nouns

Collective nouns (words like "team," "group," "family," "committee") can sometimes present a challenge. If the collective noun is acting as a single unit, it takes a singular verb. If the individuals within the collective noun are acting independently, it takes a plural verb. This can influence whether you use "does not" or "do not" with "who" when referring to them.

Example:

"The committee, which does not always agree, has finally reached a decision." (The committee acts as one unit.)
"The committee members, who do not see eye to eye on this issue, are debating further." (The individual members are acting separately.)

In the second example, "who" refers to "committee members" (plural), thus requiring "do not."

In Summary: The Antecedent is Key

The overarching rule to remember is to identify the noun or pronoun that "who" is replacing (its antecedent). Once you know whether that antecedent is singular or plural, you can confidently choose between "does not" and "do not."

Common Pitfalls to Avoid

One common mistake is to be influenced by the verb in a prepositional phrase that comes between "who" and the verb. For instance, in the sentence, "This is the person who works with the employees who have the most experience," the "who" before "have" refers to "employees" (plural), so "have" is correct. However, if you were to phrase it as "This is the employee who..." then the "who" would refer to "employee" (singular), and you would need "has." Always trace "who" back to its true subject.

Another pitfall is overthinking it. Often, the most straightforward reading of the sentence will guide you to the correct choice. Read the sentence aloud and see which phrasing sounds grammatically correct.

Frequently Asked Questions (FAQ)

How can I be sure when "who" refers to a singular or plural subject?

The best way to be sure is to look at the noun or pronoun that comes directly before "who" or the noun/pronoun that "who" is intended to replace. For example, in "The dog that barks loudly is annoying," "that" refers to "dog" (singular), so you would use "is." If it were "The dogs that bark loudly are annoying," "that" refers to "dogs" (plural), and you would use "are." Apply the same logic to "who."

Why is subject-verb agreement important?

Subject-verb agreement is fundamental to clear and correct English. When verbs do not agree with their subjects in number, it creates grammatical errors that can confuse the reader or listener, undermine your credibility, and make your writing or speech sound unprofessional.

Can "who" ever be neutral, and thus require a specific form of the verb?

No, "who" is a personal pronoun that always refers to people and must agree in number with its antecedent. It does not have a neutral form that dictates a specific verb conjugation.

Is there a difference in meaning between "who do not" and "who doesn't"?

Grammatically, "who doesn't" is simply a contraction of "who does not." Both are correct when referring to a singular subject. "Who don't" is considered a colloquialism or informal usage when referring to a singular subject, and in formal writing, it's best to avoid it and stick to "who do not" for plural subjects and "who does not" or "who doesn't" for singular subjects.