Most word formation adds something: a suffix, a prefix, another word. Conversion (also called zero-derivation) does the opposite — it moves a word into a new part of speech with no affix at all. The infinitive eten (to eat) simply becomes the noun het eten (the food). The adjective blind simply becomes the noun een blinde (a blind person). The noun fiets (bike) simply becomes the verb fietsen (to cycle). English does this constantly too (to google, a good, the rich), so the mechanism is familiar — but Dutch has its own gender and inflection consequences, and that's where the work is. We'll also look at back-formation, a related process that runs the machinery in reverse.
Infinitive → neuter noun
Any Dutch infinitive can be used as a noun meaning "the act of ___ing" or, often, the result of it. The crucial fact: a nominalized infinitive is always a het-word. No exceptions. This is one of the most reliable gender rules in the entire language.
- eten → het eten (the food / eating)
- zwemmen → het zwemmen (swimming)
- roken → het roken (smoking)
- leven → het leven (life)
- bestaan → het bestaan (existence)
- begin — careful: het begin (the beginning) comes from a noun, but the parallel holds
Het roken is in alle restaurants verboden.
Smoking is forbidden in all restaurants. The nominalized infinitive 'roken' is het.
Het zwemmen ging vandaag een stuk beter dan vorige week.
The swimming went a lot better today than last week.
Zij heeft haar hele leven in Groningen gewoond.
She lived her whole life in Groningen.
Because it's a het-word, every agreement follows: dit eten (not deze), het lekkere eten with -e on the adjective (definite het-word), een goed bestaan with no -e (indefinite het-word).
Dit eten is veel te zout, ik kan het bijna niet door mijn keel krijgen.
This food is far too salty, I can hardly get it down.
Adjective → noun
A Dutch adjective can become a noun referring to a person or a quality. Two patterns matter.
People: the adjective takes the normal -e inflection and means "the _ one(s)." Gender follows natural reference, so these are typically de-words:
- blind → een blinde (a blind person), de blinden (the blind)
- ziek → de zieke (the sick person), de zieken (the sick)
- oud → de oudere (the older one / senior), de ouderen (the elderly)
- jong → de jongere (the young person, youth)
- bekend → een bekende (an acquaintance)
De ouderen in dit dorp krijgen elke week een warme maaltijd.
The elderly in this village get a hot meal every week.
Ik kwam op het feest een oude bekende tegen.
I ran into an old acquaintance at the party.
Abstract qualities: an adjective preceded by het and inflected with -e names the quality or "the _ thing." These are het-words:
- goed → het goede (the good, that which is good)
- mooi → het mooie (the beautiful part of it)
- nieuw → het nieuwe (the new thing)
- onbekende → het onbekende (the unknown)
Het mooie van deze baan is dat ik veel mag reizen.
The nice thing about this job is that I get to travel a lot.
Mensen zijn vaak bang voor het onbekende.
People are often afraid of the unknown.
Note the inflection trap: these nominalized adjectives carry -e even when an ordinary attributive adjective wouldn't — because they are functioning as the noun itself, not modifying one. Het goede (the good), not het goed.
Noun → verb
Dutch turns nouns into verbs extremely freely by adding the infinitive ending -en (or just -n after certain stems) — pure conversion plus the standard verb ending. The verb then conjugates as a regular weak verb. This is wildly productive, and it's how Dutch absorbs new technology:
- fiets (bike) → fietsen (to cycle)
- mail → mailen (to email)
- app → appen (to message via WhatsApp)
- stofzuiger... see back-formation below
- sms → sms'en (to text)
- voetbal → voetballen (to play football)
- hamer → hameren (to hammer)
Ik fiets elke dag naar mijn werk, ook als het regent.
I cycle to work every day, even when it rains.
App me even als je er bent, dan kom ik naar beneden.
WhatsApp me when you're there and I'll come down.
Heb je haar al gemaild over de afspraak?
Have you emailed her about the appointment yet?
Back-formation
Back-formation is conversion's mirror image: instead of building a longer word from a shorter one, the language removes what looks like a suffix to create a new, shorter base — usually a verb pulled out of a compound noun.
The classic example is stofzuigen (to vacuum). Historically the noun stofzuiger (vacuum cleaner, literally "dust-sucker") came first; speakers then peeled off the -er to invent the verb stofzuigen, as if the noun had been built from it. Another is beeldhouwen (to sculpt), back-formed from beeldhouwer (sculptor, "image-hewer").
- stofzuiger → stofzuigen (to vacuum)
- beeldhouwer → beeldhouwen (to sculpt)
- koolzuur... not relevant; stick to verbs
These back-formed verbs often behave like separable verbs but, being lexicalized, are usually written and conjugated as a unit: ik stofzuig de kamer, ik heb gestofzuigd.
Ik moet vanavond nog even de woonkamer stofzuigen.
I still need to vacuum the living room tonight.
Hij heeft het hele weekend gestofzuigd en gepoetst.
He vacuumed and cleaned all weekend.
Common Mistakes
❌ de zwemmen is gezond → ✅ het zwemmen is gezond
Swimming is healthy. A nominalized infinitive is always het, never de.
❌ deze eten → ✅ dit eten
This food. 'Eten' as a noun is het, so the demonstrative is 'dit', not 'deze'.
❌ het goed van deze baan → ✅ het goede van deze baan
The good thing about this job. A nominalized adjective keeps the -e: 'het goede'.
❌ Ik heb haar gisteren gemail. → ✅ Ik heb haar gisteren gemaild.
I emailed her yesterday. Noun-to-verb 'mailen' is a regular weak verb: past participle gemaild (with -d).
❌ de ouderes / de ouden → ✅ de ouderen
The elderly. The nominalized adjective takes the regular -e plural: 'de ouderen'.
Key Takeaways
- Conversion changes word class with no affix: infinitive→noun, adjective→noun, noun→verb.
- A nominalized infinitive is always het (het eten, het zwemmen, het bestaan) — one of Dutch's most dependable gender rules.
- Nominalized adjectives keep the -e inflection (een blinde, het goede, de ouderen).
- Noun→verb conversion is hugely productive and conjugates as a regular weak verb (fietsen, mailen, appen).
- Back-formation trims an apparent suffix to coin a base, usually a verb from a compound noun (stofzuiger → stofzuigen).
Now practice Dutch
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Dutch→Related Topics
- Word Formation in Dutch: OverviewB1 — Dutch builds new words three ways: compounding (gluing words solid, like keukentafel), derivation (adding prefixes and suffixes, like verwerken or vrijheid), and conversion (using a word as a different part of speech, like het eten). This page orients you to all three and shows how parsing a word into its pieces lets you decode and even predict the meaning, gender, and plural of words you have never seen.
- Agent and Instrument NounsB1 — Dutch builds 'one who does X' and 'thing that does X' from verbs with a small set of suffixes — above all -er (bakker, opener), plus -aar (leraar, handelaar) and historically female -ster (verpleegster). This page explains which suffix attaches where, why almost all of them are de-words, and the errors English speakers make.
- De-words and Het-words: Noun GenderA1 — Dutch has a two-way gender system: common-gender de-words (about two-thirds of nouns, from the merged old masculine and feminine) and neuter het-words (a closed-ish minority worth memorising). Gender fixes the article, both demonstratives, the relative pronoun and the adjective ending — and the plural article is always de.
- Verb Reference: How to Use These TablesA2 — A guide to reading the verb-reference pages: what each conjugation table shows (present, simple past, perfect with its auxiliary, participle), how strong/weak/mixed verbs are labelled, why the auxiliary is flagged, and which verbs to master first.
- Compounding: Building Solid WordsB1 — Dutch noun compounds are written as a single solid word (keukentafel, never 'keuken tafel'), and they are head-final: the last element is the head and sets the gender and plural (de tafel gives de keukentafel; het huis gives het zomerhuis). This page covers solid spelling, head-final agreement, the linking letters tussen-s and tussen-n, and the few cases where a hyphen is correct.