Confused About Using 'What' vs 'Which' in Questions—Are These Sentences Correct?
I'm working on some interview questions for a class assignment, and I'm a bit confused about when I should use "what" and when I should use "which." For example, should I say, "What is your favorite book?" or "Which is your favorite book?"
I also came across sentences like "What color do you like best?" and "Which color do you like best?" I can't figure out if there's a specific rule, or if they are both okay but mean something different. Can someone explain when to use each one in questions?
Context:
Academic English, preparing for speaking exams.
What to Know
| What to Know | Why It Matters | Example | Quick Check |
|---|---|---|---|
| If you’re giving a short list, use 'which' . | When you’re unsure, ask yourself: Am I giving options, or is it totally open? | This wording is correct because it matches the intended meaning in context. | Does this wording match my intended meaning in this sentence? |
| Writers often memorize a definition but miss the context cue that controls the correct choice. | This helps you choose wording by meaning instead of surface form. | A different phrasing is better when the literal meaning would be clearer. | Did I choose this form for meaning, not because it looked familiar? |
3 Answers
Explanation:
Use the pattern 'What' for open, unlimited options; 'Which' for limited, specific options. This distinction is very useful in both writing and speaking.
- What is your favorite movie? (Any movie ever made—no list provided)
- Which of these movies is your favorite? (You’re choosing from a specific set, e.g., movies in a festival)
Practice: Try writing two questions for the topic 'food.' One with 'what' (any answer is possible), and one with 'which' (give a list: pizza, sushi, salad). Check: did you use 'which' when you offered the choices?
Corrective feedback: When you’re unsure, ask yourself: Am I giving options, or is it totally open? If you’re giving a short list, use 'which'.
Explanation:
A key to choosing between 'what' and 'which' is looking at the context.
- If your question points to a specific group or a visible set, use 'which': Which student finished the test first?
- If your question is about any possibility, use 'what': What sport do you play?
Check yourself: Before asking, think: Does the listener have a clear set to choose from, or could they choose anything at all?
Corrective feedback: If you said 'Which sport do you play?' but didn’t give a list or set, switch to 'What.’
Explanation:
Let’s compare 'what' and 'which' through pairs:
- What subjects do you enjoy studying? (No restrictions, could be any subject.)
- Which subjects do you enjoy studying this semester? (The list is limited to current classes.)
Practice: Make a list of three objects you have near you (pen, notebook, phone). Now, create two questions: one with 'what' (general), one with 'which' (select from your list).
Tip: If your question gives or implies a set of choices, 'which' is usually best.
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