What vs Which: Knowing the Difference in Everyday Language

what vs which
by David Harris // January 23  

Choosing between “what” and “which” can baffle even seasoned writers. The critical difference lies in their use: “what” is generally used when asking for information that does not have a specific set of options, whereas “which” indicates a choice among a defined set of choices. Let’s explore this fundamental linguistic distinction.

The Basics: Definitions and Use Cases

What is “What”?

“What” is a vague question word. Use it only when no defined range of answers exists. For example, consider the question:

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  • “What is your favorite book?”

In this case, the answer could be any book in existence. There’s no set restriction, making “what” the suitable choice.

What is “Which”?

“Which,” on the other hand, is more specific. Use this term when there are limited choices for both the speaker and the listener. For instance:

  • “Which book do you prefer: ‘Pride and Prejudice’ or ‘Moby Dick’?”

In this scenario, the options are clear, making “which” the correct term to use.

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The Range of Usage: Context Matters

Contextual Clarity

Let’s see how context shifts the choice between “what” and “which.” During a trivia night, a host might say:

  • “What is the capital of France?”

In this case, the host uses “what” because the answer can vary depending on the participants’ knowledge. Contrast this with:

  • “Which of the following two capitals is in Europe: Paris or Tokyo?”

Here, “which” is the right word because it limits the answers to just the given options.

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Situational Examples

Imagine a conversation in a bookstore. A customer might ask:

  • “What books do you recommend for someone new to science fiction?”

This question invites a broad range of suggestions. Alternatively, if the customer knows about a specific collection, they might ask:

  • “Which books in this series should I read first?”

In the latter case, “which” emphasizes familiarity with the specific options in front of them.

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Technical Distinction: Grammatical Structure

Indirect Questions and Statements

When forming indirect questions or statements, “what” tends to come first:

  • “I wonder what she thinks about the ending.”

However, when using “which,” the structure can shift:

  • “Can you tell me which options are available?”

Here, “which” is used to highlight distinct selections within a fixed set of terms.

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When Not to Use “What” or “Which”

While “what” and “which” serve essential roles, there are instances where neither word is appropriate. For example, expressions of uncertainty or emotion might not need either term:

  • “I don’t know if I want to read today.”

In this case, the words “what” and “which” are simply unnecessary.

Choosing the Right Word: Common Mistakes

Mixing Up Choices

A common mistake occurs when individuals use “what” in situations that call for “which.” For instance, saying:

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  • “What one do you like better, chocolate or vanilla?”

The correct version looks like this:

  • “Which one do you like better, chocolate or vanilla?”

Here, the set of options is clear, so “which” takes precedence.

Correcting Common Errors

To avoid such pitfalls, consider these tips:

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  1. Identify if you’re offering a range of unknown options or presenting a shortlist.
  2. Ask yourself: Are the options known to both the speaker and listener?

If the answer is yes, “which” is likely the correct term to use.

Expanding Knowledge: Examples in Literature

Literary Applications

Authors often demonstrate a mastery of language by correctly employing “what” and “which.” In George Orwell’s “1984,” an example might be:

  • “What is the Party’s slogan?”

In this case, Orwell uses the open-ended question to expand the reader’s understanding of totalitarianism. A contrasting example could be:

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  • “Which is the best method for staying rebellious? Compliance or defiance?”

In this rhetorical structure, the author gives a narrow context, making “which” appropriate.

Differences in Casual vs. Formal Contexts

Everyday Conversations

In casual conversations, the distinction may not seem urgent. A friend might casually say:

  • “What movies do you want to watch tonight?”

This choice highlights a wide range of possibilities, engaging the listener in a more relaxed tone.

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Professional Writing

In professional or academic writing, clarity is critical. Therefore, precision in word choice is paramount. An email might read:

  • “Which topics would you like to discuss in the meeting?”

Here, the formality and specificity of “which” indicate a professional context where focus and direction are essential.

Unpacking Cultural Nuances

Regional Variations

Different regions may have preferences when it comes to “what” and “which.” For instance, British English speakers might use “which” more frequently to pertain to choices in conversation. A Brit might say:

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  • “What (or which) would you like for tea?”

In contrast, American speakers often adopt “what” more liberally.

Idiomatic Expressions

Specific phrases might also twist conventional use. Expressions like:

  • “What’s the deal?”

In such phrases, “what” becomes integral to the common vernacular, regardless of the strict definitions.

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Exercises and Practice

Sharpening Your Skills

To get better at distinguishing between “what” and “which,” try this exercise:

  1. Write down ten questions using “what.”
  2. Write down ten using “which.”

Analyze the distinctions between your questions. Notice if they align with open-ended or closed-ended choices.

Group Activities

In a group setting, have participants create questions for one another using both “what” and “which.” Encourage the group to discuss why one word works better than the other in each example. This activity is excellent practice for anyone looking to improve their command of English.

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Additional Information

Understanding the difference between “what” and “which” can elevate your writing and enhance clarity.

  1. Restrictive vs. Non-restrictive Clauses: Use “which” for non-restrictive clauses that provide extra information but aren’t necessary to the main point. For example, “The book, which hit stores in 2020, became a bestseller.” Use “what” when you’re referring to specific things or choices: “What book did you read?”
  2. Questions and uncertainty: “What” often expresses inquiry about something unknown. Use it when you don’t have a specific choice in mind. For instance, “What are your thoughts on this topic?” In contrast, “which” implies a selection from a known set, as in, “Which book do you prefer, the novel or the biography?”
  3. Context Matters: In formal writing, “which” is used more frequently than “what” to introduce clauses. For example, “The research, which highlighted interesting findings, was published last month.” This distinction is crucial in academic and technical writing.
  4. Common Misuse: Many people misuse “what” when they actually mean “which.” If you’re offering options, opt for “which.” For example, “Which ice cream flavor do you want?” is correct rather than using “what.”
  5. Idiomatic Expressions: Some expressions use “what” in fixed phrases. For example, “What a beautiful day!” Although it conveys enthusiasm, it doesn’t mean you’re asking for a selection.
  6. Cultural Variations: In different dialects of English, the use of “what” and “which” can vary. Some regional speakers may interchange them, aware of their subtleties or lacking distinction entirely.
  7. Natural Flow: In conversation, “what” feels more casual, making it a go-to for everyday dialogue. For writing, consider your audience; “which” can lend a more scholarly tone.
  8. Indirect Questions: “What” is favored in indirect questions, as in, “I’d like to know what you think.” “Which” is less common in these scenarios and sounds more formal.
  9. Emphasis on choice: “Which” often emphasizes a decision-making process. It leads the listener to consider specific options, while “what” merely seeks information without a narrowed-down focus.
  10. Grammatical Structures: In sentences where you’re defining concepts or referents, “which” is often preceded by a comma since it adds non-essential information, while “what” does not require such punctuation.

Frequently Asked Questions (FAQs) Related to What vs Which

Q. What is the main difference between “what” and “which”?
A. “What” is used when there are many possibilities or when you don’t have a specific set in mind. “Which” is used when you need to choose from a defined set of options.

Q. Can I use “what” when there are only two choices?
A. Yes, but it’s more common to use “which” in that situation. For example, “Which ice cream flavor do you want?” is preferred over “What ice cream flavor do you want?” when there are only two choices.

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Q. Is it correct to say, “What book do you prefer, fiction or nonfiction?”
A. While it’s understandable, it’s better to say, “Which book do you prefer, fiction or nonfiction?” because you’re choosing from a specific set of options.

Q. Should I use “what” or “which” in the sentence, “____ color do you like best, red or blue?”
A. You should use “which” in this case, so it reads, “Which color do you like best, red or blue?”

Q. Is there a situation where “what” is more appropriate than “which”?
A. Yes, use “what” in general inquiries or open-ended questions. For example, “What do you think about reading?” invites a broader response than “Which of these books do you think about?”

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Q. Can I mix “what” and “which” in the same context?
A. Generally, it’s best to stick with one to avoid confusion. However, you can use “what” to introduce a topic and “which” to narrow it down later. For example, “What are your hobbies? Which ones do you enjoy the most?”

Q. Is “what” used for specific choices?
A. Yes, but it’s less common. You might say, “What movie is your favorite?” instead of “Which movie is your favorite?” if you’re asking for a general opinion without a specific list.

Q. Does the choice between “what” and “which” affect the meaning of a sentence?
A. Yes, it can change the focus. “What” asks for any option, while “which” narrows it down to a specific choice among known options.

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Q. Are “what” and “which” interchangeable?
A. Not always. These terms have different implications. Use “what” for open-ended questions and “which” for specific selections.

Q. If I want to ask for someone’s opinion on multiple topics, should I use “what” or “which”?
A. Use “what” for a broad question, such as “What are your thoughts on fantasy, science fiction, or romance?” If you limit to specific categories, use “which,” as in “Which genre do you prefer, fantasy or science fiction?”

Conclusion

Understanding the difference between “what” and “which” can enhance the clarity of your writing. Use “what” for open-ended questions or when you have a wide choice of options. Use “which” when you have a limited selection in front of you. Keeping these rules in mind will help you ask the right questions and choose your words wisely, making your writing more precise and effective. So next time you’re penning a query, remember: it’s not just a matter of preference—it’s about picking the right tool for the job!

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About the Author

David Harris is a content writer at Adazing with 20 years of experience navigating the ever-evolving worlds of publishing and technology. Equal parts editor, tech enthusiast, and caffeine connoisseur, he’s spent decades turning big ideas into polished prose. As a former Technical Writer for a cloud-based publishing software company and a Ghostwriter of over 60 books, David’s expertise spans technical precision and creative storytelling. At Adazing, he brings a knack for clarity and a love of the written word to every project—while still searching for the keyboard shortcut that refills his coffee.

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