Interrogative Determiners: Welke and Wat voor een | Dutch Grammar

When you point at a set of things and ask which one?, or hold up an object and ask what kind?, Dutch uses two specific question determiners: welke/welk for "which," and the wat voor (een) construction for "what kind of." Both sit in front of a noun, which is why they belong with the determiners rather than with the bare question words wie and wat covered in Wh-questions. This page is about the two forms themselves — how welke agrees with gender, and how wat voor can split apart in a way that genuinely has no English equivalent.

Welke and welk: "which"

Which in English is a single, frozen word — which book, which chair, which books, all identical. Dutch is not so forgiving. Welke/welk is a determiner, and like every other determiner in Dutch it bends to the gender of the noun it introduces. It follows exactly the same de/het logic you already know from the articles:

welk before a singular het-word: welk boek, welk huis, welk kind
welke before a singular de-word: welke stoel, welke kleur, welke vrouw
welke before any plural: welke boeken, welke huizen, welke mensen

So the rule is short: welk only for singular het-words; welke everywhere else. This is the same shape as the adjective inflection (bare after a singular het-word, -e otherwise) — see The Adjective Inflection Rule — and the same shape as elk/elke on the Elk, Ieder, Alle page. If you can do one, you can do them all.

	de-word	het-word	plural
which…	welke stoel	welk boek	welke boeken

Welke kleur vind jij het mooist?

Which colour do you like best? (kleur is a de-word → welke)

Welk huis hebben jullie uiteindelijk gekocht?

Which house did you end up buying? (huis is a het-word → welk)

Welke boeken moet ik voor dit vak lezen?

Which books do I have to read for this course? (plural → always welke)

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Tie welk/welke to gender the same way you tie het/de to it. The moment you learn that a noun is a het-word, you've also learned that it takes welk: het station → welk station, het antwoord → welk antwoord.

Welke standing alone

Welke can also stand on its own, with the noun dropped because it's obvious from context — "which one?" Here it behaves like a de-word pronoun and almost always appears as welke, even when the thing referred to is neuter, because the bare pronoun defaults to the -e form.

Er liggen drie pennen op tafel — welke is van jou?

There are three pens on the table — which one is yours?

Ik twijfel tussen die twee jassen. Welke zou jij nemen?

I'm torn between those two coats. Which one would you take?

Wat voor (een): "what kind of"

When you want the type or sort of something rather than a choice from a known set, you switch to wat voor (een) — literally "what for a," but meaning "what kind of." Compare the two questions: Welke auto wil je? assumes there are specific cars to choose between ("which car?"), while Wat voor auto wil je? asks about the category ("what kind of car — a small one, an electric one, a cheap one?").

The little word een in the middle is optional and unstressed. With singular count nouns you'll hear it both ways; with plurals and mass nouns it disappears.

Wat voor (een) muziek luister je het liefst?

What kind of music do you most like to listen to?

Wat voor werk doe je eigenlijk?

What kind of work do you actually do? (mass noun → no een)

Wat voor schoenen zoekt u?

What kind of shoes are you looking for? (plural → no een)

Notice that wat voor does not inflect for gender. Unlike welk/welke, there is no het-word form to worry about — wat voor boek, wat voor stoel, wat voor huis are all the same. This is the one place where "what kind of" is easier than "which."

The split: wat … voor

Here is the feature with no English parallel. Wat voor is not glued together. The wat and the voor can pull apart and sit in different positions in the clause, with the noun stranded after voor. English physically cannot do this — "what … kind of …" would shatter the phrase — but in Dutch it's not only possible, it's the more natural, more colloquial word order in many sentences.

Compare the unsplit and split versions of the same question:

Wat voor muziek luister je?

What kind of music do you listen to? (unsplit — wat voor stays together)

Wat luister je voor muziek?

What kind of music do you listen to? (split — wat moves up front, voor muziek drops to the end)

Both are correct; the second sounds more relaxed and spoken. The wat leaps to the front question slot, the finite verb and subject follow, and voor + noun lands later in the clause. The longer the sentence, the more natural the split feels:

Wat heb jij vroeger voor boeken gelezen?

What kind of books did you used to read? (wat at the front, voor boeken just before the participle)

Wat is dat nou voor een vraag?

What kind of a question is that?! (split, with a flicker of irritation — nou adds the exasperation)

That last one is worth memorising as a set phrase. Wat is dat nou voor een vraag? / Wat is dat voor een geluid? ("what's that noise?") are everyday spoken Dutch, and they show the split at full stretch: wat and voor are separated by the verb, the subject, and a particle.

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Treat wat … voor like a separable verb that's been pulled apart. The wat claims the question slot at the front; the voor + noun waits near the end. If you can handle Ik bel je morgen op (separable opbellen), you can handle Wat is dat voor een ding?

Why the split exists

The logic is that wat is fundamentally the question word — it's what makes the sentence a question — so it gravitates to the front, where Dutch puts its question words. The voor + noun is a separate prepositional chunk that attaches to the noun phrase, and Dutch is comfortable leaving prepositional material later in the clause. The two were never a single unit to begin with; English just happens to lock its equivalent ("what kind of") into one immovable block. Recognising the split is the difference between understanding fast spoken Dutch and being thrown by it.

Welke vs wat voor: choosing

The distinction mirrors English which vs what kind of almost exactly, so your instinct usually transfers:

welke/welk — a choice from a definite, known set. Welke film gaan we kijken? (which film, out of the ones available)
wat voor (een) — an open-ended type or category. Wat voor film wil je kijken? (what genre/sort, with no fixed list in mind)

Welke trein neem jij, die van 8 uur of die van half 9?

Which train are you taking, the 8 o'clock or the 8:30? (a fixed choice → welke)

Wat voor trein is dit eigenlijk — een intercity of een sprinter?

What kind of train is this actually — an intercity or a local? (asking the category → wat voor)

Common Mistakes

❌ Welke boek heb je gelezen?

Wrong — boek is a singular het-word, so it needs welk, not welke.

✅ Welk boek heb je gelezen?

Which book did you read?

❌ Welk stoel is van jou?

Wrong — stoel is a de-word, so it takes welke. The bare welk is only for singular het-words.

✅ Welke stoel is van jou?

Which chair is yours?

❌ Welke muziek luister je? (meaning 'what kind of music')

Not wrong grammatically, but it means 'which music' — a choice from known options. For 'what genre/sort', use wat voor.

✅ Wat voor muziek luister je?

What kind of music do you listen to?

❌ Wat soort auto heb je? (calque of English 'what sort')

Wrong word order — Dutch doesn't say 'wat soort'. Use wat voor (een), or the noun-based wat voor soort auto.

✅ Wat voor (een) auto heb je?

What kind of car do you have?

❌ Wat voor luister je muziek?

Wrong split — when you split it, the noun stays attached to voor: 'voor muziek' moves together. You can't strand muziek before voor.

✅ Wat luister je voor muziek?

What kind of music do you listen to? (voor muziek travels as a unit)

Key Takeaways

Welke/welk means "which" and agrees with gender: welk before a singular het-word (welk boek), welke before a singular de-word and before all plurals (welke stoel, welke boeken).
Wat voor (een) means "what kind of"; the een is optional with singular count nouns and absent with plurals and mass nouns. It does not inflect for gender.
Wat voor can split across the clause — Wat luister je voor muziek?, Wat is dat nou voor een vraag? — with wat at the front and voor + noun near the end. English cannot replicate this movement.
When you split it, voor + noun stays together; never strand the noun before voor.
Use welke for a choice from a known set, wat voor for an open-ended type or category.

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