Which of the Following Is/Are Correct? Understanding Subject-Verb Agreement with Relative Pronouns
One of the most confusing grammar questions that English learners face is deciding whether to use "is" or "are" after the word "which." The phrase "which of the following is/are correct" appears constantly in tests, quizzes, and everyday communication, yet many people remain uncertain about which verb form is grammatically correct. Understanding the rules behind this construction will not only improve your grammar but also help you communicate more confidently in both written and spoken English.
What Is "Which" and How Does It Function?
The word "which" is a relative pronoun—a word that connects a clause or phrase to a noun or pronoun in a sentence. Relative pronouns like "which," "who," "that," "whom," and "whose" introduce relative clauses that provide additional information about something mentioned earlier in the sentence.
When "which" appears at the beginning of a question, it functions as an interrogative pronoun, asking for identification or selection from a group. In the construction "which of the following," the word "which" asks the listener or reader to choose one or more items from a set of options presented below or after the question.
The key to answering "which of the following is/are correct" lies in understanding how subject-verb agreement works with this particular structure.
The Core Rule: Singular or Plural?
The fundamental principle governing whether you should use "is" or "are" after "which of the following" depends on whether the answer refers to one item or multiple items.
- Use "is" when the correct answer consists of a single item
- Use "are" when the correct answer consists of multiple items
This seems straightforward, but complications arise because the word "following" itself is grammatically singular. The word "following" functions as a singular noun or adjective, which leads many people to automatically choose "is" regardless of how many answers are actually correct Easy to understand, harder to ignore..
That said, the verb agreement in "which of the following is/are correct" depends on the number of correct answers, not on the word "following" itself. The phrase "of the following" acts as a prepositional phrase that modifies "which," and the actual subject of the sentence remains "which"—a pronoun that can be either singular or plural depending on context Most people skip this — try not to. Simple as that..
Understanding the Grammar Behind the Choice
To fully grasp this grammar rule, you need to recognize that "which" operates as the subject of the sentence, not "following." When you ask "which of the following is correct," you are essentially asking "which one is correct"—with "one" being implied. Conversely, when you ask "which of the following are correct," you are asking "which ones are correct.
The verb must agree with "which" and whatever it represents in terms of number. Here is how this works in practice:
Singular verb ("is"):
Which of the following is the capital of France?
In this example, only one answer can be correct, so "is" is appropriate.
Plural verb ("are"):
Which of the following are prime numbers?
In this case, multiple answers could be prime numbers, making "are" the correct choice.
The same logic applies to statements rather than questions. Consider these examples:
- "Which of these books is yours?" (assuming only one belongs to you)
- "Which of these books are available for borrowing?" (asking about multiple books that might be available)
Common Mistakes and How to Avoid Them
The most frequent error people make is defaulting to "is" simply because "following" looks singular. This is a grammatical fallacy that leads to incorrect subject-verb agreement. Remember that "following" is not the subject of the sentence—it is part of a prepositional phrase that merely describes which set of options you are referring to.
Another common mistake involves collective nouns within the options. Even if the options themselves contain plural nouns, the verb agreement still depends on how many correct answers exist. For example:
Which of the following are types of fruit?
Even though "types" is plural in each option, the question asks about multiple correct answers, so "are" is correct The details matter here..
Quick Reference Guide
Use this checklist to determine the correct verb form:
- Determine how many correct answers exist in the given options
- If only one answer is correct, use "is"
- If multiple answers are correct, use "are"
- Ignore the word "following"—it does not control verb agreement
- Consider whether the question implies "which one" or "which ones"
Practice Examples with Explanations
Understanding this grammar rule becomes clearer through practical examples. Here are several scenarios that demonstrate the correct usage:
Example 1:
Which of the following is the largest ocean on Earth?
Explanation: Only one ocean is the largest, so the singular verb "is" is correct And that's really what it comes down to. And it works..
Example 2:
Which of the following are considered mammals?
Explanation: Multiple animals can be mammals, so the plural verb "are" is appropriate.
Example 3:
Which of the following is correct: "Its' " or "Its"?
Explanation: The question asks which single option is grammatically correct, making "is" the right choice.
Example 4:
Which of the following are the ingredients needed for this recipe?
Explanation: A recipe requires multiple ingredients, so "are" matches the plural nature of the answer The details matter here..
Example 5:
Which of the following is the fastest land animal?
Explanation: Only one animal holds this title, so "is" is correct.
Frequently Asked Questions
Does "following" affect whether I use "is" or "are"?
No. The word "following" is part of a prepositional phrase and does not determine verb agreement. The verb must agree with the number of correct answers implied by "which.
What if I do not know how many answers are correct?
When uncertain, consider the context. Academic questions often specify "which of the following is correct" when expecting one answer, or "which of the following are correct" when multiple selections are possible. Look for clues in the question format Small thing, real impact..
Can I ever use either "is" or "are" interchangeably?
In standard English grammar, no—they are not interchangeable. Using the wrong verb form creates a subject-verb agreement error, even if the meaning remains clear.
How does this compare to "which one" versus "which ones"?
The construction "which one" always takes a singular verb, while "which ones" always takes a plural verb. "Which of the following" functions similarly: singular for one answer, plural for multiple answers.
Conclusion
The answer to "which of the following is/are correct" depends entirely on the number of correct answers in the given options. Here's the thing — use "is" when only one answer is correct, and use "are" when multiple answers are correct. The word "following" is grammatically irrelevant to this decision—it merely identifies which set of options you are selecting from Small thing, real impact. Still holds up..
No fluff here — just what actually works.
This grammar rule falls under the broader category of subject-verb agreement with relative and interrogative pronouns. Once you understand that "which" must match its verb in number, and that the number depends on how many items you are referring to, you will never second-guess yourself again.
This is the bit that actually matters in practice.
Mastering this distinction will improve not only your test-taking abilities but also your overall English communication. Whether you are writing an academic paper, composing an email, or simply speaking with others, using the correct verb form demonstrates grammatical awareness and attention to detail. The next time you encounter "which of the following," you will know exactly whether to choose "is" or "are"—and more importantly, you will understand why And that's really what it comes down to..
