trenge (to need) | Norwegian Grammar

trenge ("to need") is the workhorse verb for expressing necessity in everyday Norwegian. It is a tidy weak Class 2 verb, so the forms hold no surprises, but its real value is grammatical: trenge lets you say "need to" without reaching for a modal, and its negation — ikke trenge (å) — is the gentle, idiomatic way to say "don't have to / needn't." Getting that negation right is the single most useful thing on this page, because the obvious-looking alternative du må ikke means something quite different.

Conjugation

Class: weak, Class 2 (-te / -t). Auxiliary: ha.

Tense / mood	Norwegian	English
Infinitiv	å trenge	to need
Presens	trenger	need(s)
Preteritum	trengte	needed
Perfektum	har trengt	have/has needed
Pluskvamperfektum	hadde trengt	had needed
Futurum	skal/vil trenge	will need
Imperativ	treng!	need! (rare)
Presens partisipp	trengende	needy / in need (adjective)

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Class 2 verbs take -te in the preterite and -t in the supine: trengte, har trengt. The stem ends in -ng, so you write a clean trengte / trengt — no extra vowel. Beware the false analogy with strong verbs: there is no trang or har trunget. (The unrelated adjective trang "narrow, tight" exists, which is exactly why the wrong preterite tempts people.)

Two structures: trenge + noun and trenge å + infinitive

trenge works in two patterns, and English uses two different words for them — but Norwegian uses one verb for both.

1. trenge + noun — to need a thing. The object is a plain noun phrase, no preposition.

Jeg trenger penger til bussen — har du noen kroner?

I need money for the bus — do you have any kroner?

Vi trenger mer melk, vil du kjøpe på vei hjem?

We need more milk, will you buy some on the way home?

Trenger du noe fra butikken?

Do you need anything from the shop?

2. trenge å + infinitive — to need to do something. Here trenge takes the infinitive marker å before the next verb, exactly as English uses "to."

Du trenger å hvile litt før reisen i morgen.

You need to rest a bit before tomorrow's trip.

Jeg trenger å snakke med deg om noe viktig.

I need to talk to you about something important.

Because trenge is an ordinary main verb (not a modal), it keeps the å — unlike må, kan, vil, skal, which take a bare infinitive. This is a frequent slip for English speakers, who feel "need" behaving half like a modal. In Norwegian it is fully a regular verb: jeg trenger *å gå, never *jeg trenger gå (in the affirmative).

ikke trenge (å) — the polite "don't have to"

This is the high-value point of the page. The negation ikke trenge expresses absence of necessity — "there's no need to," "you don't have to," "you needn't." It is the everyday, friendly way to tell someone an action is unnecessary.

Du trenger ikke å betale nå — vi tar det senere.

You don't have to pay now — we'll sort it out later.

Dere trenger ikke vente på meg, bare gå inn.

You don't need to wait for me, just go on in.

Han trengte ikke å si det høyt; alle skjønte det.

He didn't need to say it out loud; everyone understood.

Notice that after the negation the å can be dropped: both du trenger ikke å betale and du trenger ikke betale are correct and common, with the å-less version sounding slightly more colloquial. (In the affirmative, by contrast, you should keep the å.)

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Norwegian has two ways to say "don't have to," where English has one — and a learner must keep them apart. Du trenger ikke (å) gå = "you don't need to go" (no obligation; staying is fine). Du må ikke gå looks like "you must not go," but in Norwegian it is ambiguous and often also means "you don't have to go." This overlap traps English speakers constantly — see the dedicated errors/maa-ikke page. The safe rule: to say "you don't have to," use trenger ikke, which is never ambiguous.

trenge vs må — needing vs having to

Both express necessity, but they sit at different strengths and registers. trenge is about a need — something lacking that ought to be supplied. må (the modal måtte) is about obligation or compulsion — you have no choice. Often they overlap, but the nuance is real:

Jeg trenger å sove; jeg er helt utkjørt.

I need to sleep; I'm completely worn out.

Jeg må gå nå, ellers rekker jeg ikke toget.

I have to go now, or I won't make the train.

The first is an internal need; the second is an external constraint. When you mean a requirement you wish were otherwise, må fits; when you mean a want or lack, trenge fits. This is why the negations diverge so sharply: removing a need (trenger ikke) simply lifts the need, while må ikke tangles with prohibition.

trenge seg — the "force one's way" sense

A second, unrelated meaning of trenge is "to press, push, force." It is mostly used reflexively or with a particle, and it is worth recognising even at A2 because it turns up in news reports and everyday descriptions of crowds.

trenge seg på — to push oneself forward, impose, intrude.
trenge seg inn — to force one's way in, break in.

Folk trengte seg på for å komme nærmere scenen.

People pushed forward to get closer to the stage.

Tyven hadde trengt seg inn gjennom kjellervinduet.

The thief had forced his way in through the basement window.

This sense uses the same conjugation (trengte seg, har trengt seg), so once you know the paradigm you have it for free.

Common Mistakes

❌ Jeg trengde hjelp i går.

Incorrect — Class 2 takes -te, so the preterite is trengte, not trengde

✅ Jeg trengte hjelp i går.

I needed help yesterday.

❌ Jeg trenger snakke med deg.

Incorrect — in the affirmative, trenge keeps the infinitive marker å

✅ Jeg trenger å snakke med deg.

I need to talk to you.

❌ Du må ikke betale — det er gratis.

Risky — 'må ikke' can read as 'must not'; to say 'you don't have to', use trenger ikke

✅ Du trenger ikke å betale — det er gratis.

You don't have to pay — it's free.

❌ Har du trengte det noen gang?

Incorrect — after har use the supine trengt, not the preterite trengte

✅ Har du trengt det noen gang?

Have you ever needed it?

Key Takeaways

trenge / trenger / trengte / har trengt / treng! — weak Class 2, fully regular.
Two patterns: trenge + noun (trenger penger) and trenge å + infinitive (trenger å gå). Keep the å in the affirmative.
ikke trenge (å) = "don't have to / needn't" — the clear, polite alternative to the ambiguous må ikke. The å may be dropped after the negation.
Distinguish trenge (a need/lack) from må (an obligation).
A separate sense, trenge seg på/inn, means "force one's way."

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