Wassen, Blazen, Laten — Class-7 AA Verbs

Wassen ("to wash"), blazen ("to blow"), and laten ("to let, leave, have something done") belong to the class-7 strong verbs, whose signature is a vowel that swings to ie in the past and then returns home in the participle. For the aa-verbs this means aa → ie → aa: blaas → blies → geblazen, laat → liet → gelaten. They all take hebben. The complication on this page is wassen: its participle is reliably the strong gewassen, but its past tense has drifted. The older strong past wies/wiesen still exists in writing and set phrases, while almost everyone today simply says the weak waste/wasten. That makes wassen a "mixed" verb — strong participle, mostly-weak past — and a perfect illustration of how a strong verb regularises piece by piece. This page conjugates all three and is explicit about wassen's split personality.

The aa → ie → aa pattern at a glance

InfinitivePast (sg.)Past (pl.)Past participlePerfect auxiliary
blazenbliesbliezengeblazenhebben
latenlietlietengelatenhebben
wassenwaste (usual) / wies (older)wasten / wiesengewassenhebben

Classification: class-7 strong (a "reduplicating" class historically). The hallmark is that the present and participle share the same vowel (aa), and the past replaces it with ie: blaas → blies → geblazen. This is the same group as slapen → sliep → geslapen, vallen → viel → gevallen, and houden → hield → gehouden. The past vowel ie is long; the singular is spelled -ie (blies, liet, wies) and the plural keeps the long vowel in an open syllable (blie·zen, lie·ten, wie·sen).

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Class 7 is the aa/a → ie family: blazen, laten, slapen, vallen, houden, lopen, roepen. If you know slaap → sliep → geslapen, you already have the template for blaas → blies → geblazen and laat → liet → gelaten.

Blazen — to blow (hebben)

The stem is blaas- (the a doubles to aa in the closed singular). Past blies / bliezen, participle geblazen. It works for blowing out candles, the wind blowing, blowing a whistle, and the idiom hoog van de toren blazen ("to brag, talk big").

PersonPresentPastPerfect
ikblaasbliesheb geblazen
jij / jeblaastblieshebt geblazen
ublaastblieshebt geblazen
hij / zij / hetblaastbliesheeft geblazen
wij / weblazenbliezenhebben geblazen
jullieblazenbliezenhebben geblazen
zij / zeblazenbliezenhebben geblazen

De wind blies de paraplu binnenstebuiten.

The wind blew the umbrella inside out. Singular past 'blies'.

Ze blies in één keer alle kaarsjes uit.

She blew out all the candles in one go. Past 'blies'.

Heb je ooit op een echte alpenhoorn geblazen?

Have you ever blown a real alphorn? Perfect 'geblazen'.

Laten — to let, to leave, to have something done (hebben)

The stem is laat-. Past liet / lieten, participle gelaten. Laten is one of the most useful verbs in Dutch and carries several meanings:

  • to let / allow: Laat me even denken. ("Let me think.")
  • to leave (something somewhere): Ik heb mijn paraplu thuis gelaten. ("I left my umbrella at home.")
  • to have something done (causative): Ik heb mijn haar laten knippen. ("I had my hair cut.") — note: in this causative use the infinitive laten replaces the participle in the perfect (heb laten knippen, not heb gelaten knippen).
PersonPresentPastPerfect
iklaatlietheb gelaten
jij / jelaatliethebt gelaten
ulaatliethebt gelaten
hij / zij / hetlaatlietheeft gelaten
wij / welatenlietenhebben gelaten
jullielatenlietenhebben gelaten
zij / zelatenlietenhebben gelaten

Note the jij/hij present is just laat — the stem ends in -t, so no extra -t is added.

Laat je hond niet los in dit weiland — er lopen schapen.

Don't let your dog off the leash in this field — there are sheep about. Imperative 'laat'.

Hij liet de deur openstaan en de hele warmte ontsnapte.

He left the door open and all the heat escaped. Past 'liet'.

We hebben vorige week onze cv laten nakijken.

Last week we had our boiler serviced. Causative perfect — infinitive 'laten', not 'gelaten'.

Wassen — to wash (the mixed verb)

Wassen means "to wash" (clothes, dishes, your hands, your hair). Its participle is always the strong gewassengewast is wrong. But its past tense has two faces:

  • waste / wasten — the weak, modern, everyday form. This is what virtually all speakers say now.
  • wies / wiesen — the older strong form. You still meet it in literary or biblical-flavoured text and in fixed expressions, but it sounds archaic in ordinary speech.

This split makes wassen a textbook example of a verb caught mid-regularisation: the high-frequency past went weak, while the participle held onto its strong shape.

PersonPresentPast (usual, weak)Past (older, strong)Perfect
ikwaswastewiesheb gewassen
jij / jewastwastewieshebt gewassen
hij / zij / hetwastwastewiesheeft gewassen
wij / jullie / zijwassenwastenwiesenhebben gewassen

A common reflexive use is zich wassen ("to wash oneself / get washed"): ik was me, hij wast zich. Beware the homograph: was is also the past tense of zijn ("was") and the noun "wax/laundry" — context tells them apart.

Ik was elke zondag een grote berg kleren.

Every Sunday I wash a big pile of clothes. Present 'was' (to wash).

Vroeger waste mijn oma alles nog met de hand.

My grandma used to wash everything by hand. Modern weak past 'waste'.

Heb je je handen wel goed gewassen?

Did you wash your hands properly? Participle 'gewassen' — always strong.

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For wassen: say the weak waste / wasten in the past (the older strong wies sounds archaic), but always use the strong participle gewassen. Gewast is simply wrong.

Imperatives

VerbImperativeExample
wassenwasWas eerst even je handen. — Wash your hands first.
blazenblaasBlaas de kaarsjes maar uit. — Blow out the candles.
latenlaatLaat me met rust. — Leave me alone.

Common Mistakes

❌ De wind blaasde de bladeren van de tafel.

Incorrect — blazen is strong: the past is 'blies', never 'blaasde'.

✅ De wind blies de bladeren van de tafel.

The wind blew the leaves off the table.

❌ Hij heeft de deur open gelaaten.

Incorrect — the participle of laten is 'gelaten' (one a), not 'gelaaten'.

✅ Hij heeft de deur open gelaten.

He left the door open.

❌ Ik laatte mijn tas in de trein liggen.

Incorrect — laten is strong: the past is 'liet', never 'laatte'.

✅ Ik liet mijn tas in de trein liggen.

I left my bag on the train.

❌ Heb je je auto al gewast?

Incorrect — the participle of wassen is the strong 'gewassen', not 'gewast'.

✅ Heb je je auto al gewassen?

Have you washed your car yet?

❌ We hebben ons huis laten schilderen — het ziet er prachtig uit, ze hebben het in twee dagen geschilderd gelaten.

Incorrect — the causative uses the infinitive 'laten' in the perfect, not 'gelaten': 'hebben laten schilderen'.

✅ We hebben ons huis laten schilderen.

We had our house painted.

Key Takeaways

  • All three are class-7 strong with hebben; the past swings to ie and the participle returns to a/aa: blies / geblazen, liet / gelaten.
  • blazen: blaas → blies → geblazen; never blaasde.
  • laten: laat → liet → gelaten; in the causative ("have something done") the perfect uses the infinitive laten, not gelatenik heb mijn haar laten knippen.
  • wassen is mixed: say the weak waste/wasten today (older strong wies is archaic), but the participle is always the strong gewassen — never gewast.

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Related Topics

  • Verb Reference: How to Use These TablesA2A 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.
  • Strong Verbs: Vowel Change in the PastB1How Dutch strong verbs form the simple past by changing the stem vowel, and how their past participle ends in -en — including the singular/plural vowel split that most resources leave out.
  • The Seven Ablaut Classes of Strong VerbsB2How Dutch strong verbs sort into seven systematic ablaut classes — each with a predictable vowel pattern and an English cognate class as an anchor — so you can predict the past of a verb you've never seen.
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