If you’ve ever paused mid-sentence wondering whether to write “what kind of book” or “what kinds of books,” you’re not alone. This tiny grammar hiccup trips up native speakers and English learners alike. The good news is that the rule behind it is refreshingly simple once you see it clearly.
In this guide, you’ll learn exactly when to use each phrase, why the distinction matters, and how to avoid the mistakes that even confident writers make. By the end, you’ll never second-guess yourself again.
Quick Answer
- “What kind of” pairs with a singular or uncountable noun and asks about one category or type.
- “What kinds of” pairs with a plural noun and asks about multiple categories or types.
Example:
- What kind of coffee do you drink? (one general preference)
- What kinds of coffee does this shop sell? (a variety of options)
That’s the whole rule in a nutshell. Everything else in this article simply builds on that foundation.
Meaning of “What Kind of”
“What kind of” is used when you’re asking about a single category, class, or type of something. It treats the noun that follows as singular, even if the topic itself feels broad.
Think of “kind” as a container word — it holds one classification at a time. When you ask “what kind of,” you’re inviting the listener to narrow their answer down to one general type, such as a genre, a category, or a style.
When to Use It
Use “what kind of” in the following situations:
- With singular countable nouns — What kind of car do you want to buy?
- With uncountable nouns — What kind of advice are you looking for?
- With collective nouns treated as a single unit — What kind of team culture do you want to build?
- When expecting one general answer — What kind of music helps you focus?
Notice that even though the answer might touch on several examples, the question itself is framed around a single overarching category.
Kind or kinds of things
A common point of confusion is the phrase “kind of things” versus “kinds of things.” Here’s the simple breakdown:
- “What kind of things” — informally used to ask about a general category, even though “things” is technically plural. This is common in casual, spoken English.
- “What kinds of things” — the grammatically precise version, matching the plural noun “things” with the plural form “kinds.”
In relaxed conversation, people often say “what kind of things do you like?” without worrying too much about strict agreement. In formal writing, however, “what kinds of things” is the more accurate and polished choice.
Meaning of “What Kinds of”
“What kinds of” signals that you expect more than one type, category, or variety in the response. It pairs naturally with plural nouns and reflects a broader, more exploratory question.
This phrase works well when you want a list-style answer rather than a single, narrow reply. It’s the phrase of choice when diversity or range is part of the conversation.
When to Use It
Reach for “what kinds of” when:
- The noun is plural — What kinds of shoes do you sell?
- You expect multiple categories in the answer — What kinds of skills does this job require?
- You’re discussing variety or diversity — What kinds of cuisines does the restaurant offer?
- The context implies more than one option — What kinds of exercises help build strength?
In each case, the plural noun that follows “kinds of” confirms that you’re asking about a range, not a single item.
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What kind of vs what kinds of sentences
Seeing both phrases side by side in real sentences makes the difference click faster than any rule ever could.
| Sentence with “What kind of” | Sentence with “What kinds of” |
| What kind of phone do you use? | What kinds of phones does the store carry? |
| What kind of job are you looking for? | What kinds of jobs are available in this field? |
| What kind of weather do you enjoy? | What kinds of weather patterns affect farming? |
| What kind of dog is that? | What kinds of dogs are good with children? |
| What kind of help do you need? | What kinds of resources are available to students? |
Reading these pairs aloud is a great way to train your ear. Over time, the correct phrase starts to feel automatic.
Key Difference Explained Simply
At its core, the distinction comes down to one word: number.
- Kind = singular → one category
- Kinds = plural → multiple categories
The noun that follows the phrase should agree with that number. A singular or uncountable noun follows “kind of.” A plural noun follows “kinds of.”
Here’s a simple test you can run in your head before you speak or write:
- Am I expecting one type of answer, or several?
- Does the noun after the phrase end in an “s,” or not?
- If both point to plural, use “kinds of.” If both point to singular, use “kind of.”
This quick mental checklist resolves almost every case you’ll encounter in daily English.
Comparison Table: What Kind of vs What Kinds of
| Feature | What Kind of | What Kinds of |
| Noun form required | Singular or uncountable | Plural |
| Number of categories expected | One | Multiple |
| Common usage | Everyday, general questions | Detailed, exploratory questions |
| Example noun | music, advice, car | books, jobs, cuisines |
| Formality level | Works in both casual and formal speech | Preferred in formal and academic writing |
| Typical answer style | Single focused response | List of varied responses |
This table works well as a quick reference whenever you’re unsure which version fits your sentence.
Real-Life Example Scenarios
Grammar rules stick better when you see them applied to everyday situations. Here are a few practical scenarios:
At a restaurant:
- What kind of dressing comes with the salad? (one option expected)
- What kinds of desserts do you have on the menu? (a list expected)
At a job interview:
- What kind of role are you hoping to grow into? (one career direction)
- What kinds of projects have you led before? (multiple examples expected)
In a classroom:
- What kind of essay structure should we follow? (one format)
- What kinds of sources are acceptable for this research paper? (several categories)
In casual conversation:
- What kind of movie do you feel like watching tonight? (one genre)
- What kinds of movies do you usually enjoy? (a general range of preferences)
Notice how the phrase you choose shapes the kind of answer you’re likely to get. Precise phrasing leads to clearer communication.
What kind of vs what kinds of grammar
From a grammar standpoint, this pair follows the standard rule of subject-noun agreement. “Kind” is a singular noun, so it naturally pairs with other singular or uncountable nouns. “Kinds” is the plural form, so it pairs with plural countable nouns.
A few grammar notes worth remembering:
- Demonstratives must also agree: “this kind of book” (singular) and “these kinds of books” (plural). Saying “these kinds of books” or “this kinds of book” breaks agreement rules.
- Collective nouns like family, team, or group are grammatically singular, so they usually pair with “what kind of,” even though they refer to multiple people.
- Abstract or uncountable nouns like love, freedom, or furniture almost always pair with “what kind of” because they don’t have a standard plural form.
Keeping these grammar patterns in mind will help you avoid the most frequent slip-ups.
Common Mistakes and How to Avoid Them
Even experienced writers occasionally mix these phrases up. Here are the most frequent errors:
- Mismatched numbers — “What kind of books do you read?” should be “What kinds of books do you read?” since “books” is plural.
- Incorrect demonstrative pairing — “These kind of shoes” should be “These kinds of shoes.”
- Overcorrecting uncountable nouns — Saying “what kinds of advice” is technically incorrect since “advice” is uncountable; stick with “what kind of advice.”
- Ignoring context in casual speech — In relaxed conversation, people often say “what kind of” even with plural nouns. This is common informally, but it’s best avoided in formal writing.
- Forgetting collective nouns are singular — “What kinds of team are you building?” should be “What kind of team are you building?”
How to avoid these mistakes:
- Pause and check whether the noun after the phrase is singular, plural, or uncountable.
- Read your sentence aloud — mismatched grammar often sounds noticeably off.
- When editing formal writing, double-check every instance of “kind” or “kinds” against the noun it modifies.
Helpful Memory Trick
Here’s a simple trick to lock this rule into memory:
“Kind” has no “s,” so it wants a noun with no “s.” “Kinds” has an “s,” so it wants a noun with an “s” too.
Another way to remember it: think of “kind” as a single box holding one category, and “kinds” as several boxes, each holding a different category. If you’re only opening one box, use “kind of.” If you’re opening a whole shelf of boxes, use “kinds of.”
American vs British English Differences
Here’s some reassuring news: this particular grammar rule doesn’t change across English dialects. Both American and British English follow the same singular-plural agreement pattern for “kind of” and “kinds of.”
That said, a few subtle style differences exist:
- American English speakers tend to use “what kind of” more loosely in casual conversation, even with plural nouns.
- British English speakers, particularly in formal or academic contexts, tend to be slightly stricter about matching “kinds of” with plural nouns.
- Both dialects accept “these kinds of” and reject “these kinds of” in formal writing.
So while pronunciation and vocabulary may shift between American and British English, this grammar rule remains consistent worldwide.
Related Phrases and Synonyms
Several other expressions follow the same singular-plural logic as “kind of” and “kinds of.” Recognizing them can add variety to your writing:
- What type of / What types of
- What sort of / What sorts of
- Which category of / Which categories of
- What variety of / What varieties of
- What class of / What classes of
Each of these pairs works the same way: the singular form pairs with a singular or uncountable noun, and the plural form pairs with a plural noun.
Why This Distinction Matters
You might wonder whether such a small grammar detail is really worth the effort. It is, for a few good reasons:
- Clarity — Using the correct form tells your listener or reader exactly how many types of answers you expect.
- Professionalism — In resumes, emails, and academic writing, small grammar errors can quietly undermine your credibility.
- Precision in communication — Journalists, teachers, researchers, and business professionals rely on precise phrasing to guide focused conversations and avoid misunderstandings.
- Confidence — Once you internalize this rule, you’ll stop hesitating mid-sentence and start speaking and writing with more assurance.
Small grammar choices like this one often make a bigger impression than we realize.
Practice Sentences
Test yourself by filling in the correct phrase. Choose between “what kind of” and “what kinds of”:
- ______ shoes comfortable for running?
- ______ furniture do you have in your living room?
- ______ challenges did the team face this quarter?
- ______ music genre do you enjoy most?
- ______ vegetables grow well in this climate?
- ______ support does the company provide new employees?
- ______ books line your bookshelf?
- ______ car should I buy for a large family?
Answers: 1. what kinds of, 2. what kind of, 3. what kinds of, 4. what kind of, 5. what kinds of, 6. what kind of, 7. what kinds of, 8. what kind of
Frequently Asked Questions
Is “what kind of” always followed by a singular noun?
Yes, in standard grammar “what kind of” pairs with a singular or uncountable noun, even in casual speech where exceptions sometimes occur.
Can “what kind of” ever be used with plural nouns?
It’s common informally, but formal and academic writing calls for “what kinds of” whenever the following noun is plural.
Is “what sort of” the same as “what kind of”?
Yes, “sort” and “kind” are close synonyms, and “what sort of” follows the exact same singular-noun rule.
Do American and British English use different rules for this phrase?
No, both dialects follow the same singular-plural agreement, though American casual speech is sometimes more relaxed about it.
What’s the easiest way to remember which one to use?
Check the noun right after the phrase — if it ends in “s” and is plural, use “kinds of”; if not, use “kind of.”
Is “these kind of” ever correct?
No, “these kind of” breaks agreement rules. The correct form is “these kinds of,” matching the plural demonstrative with a plural noun.
Does “kind of” always function as a question starter?
No, “kind of” can also mean “somewhat” in casual speech, as in “I’m kind of tired,” which is unrelated to the question form.
Summary
The difference between “what kind of” and “what kinds of” comes down to one simple rule: singular versus plural. Use “what kind of” when asking about one general category, and reserve “what kinds of” for questions expecting multiple types or varieties.
Keep the noun agreement in mind, watch out for common mistakes with demonstratives and collective nouns, and use the comparison table and practice sentences above whenever you need a quick refresher. With a little practice, choosing the right phrase will become second nature — and your writing and speech will sound noticeably more polished as a result.
