Modal Verbs: Overview

Modal verbs are the small set of helpers that express ability, permission, obligation, intention, and futurity — English "can, may, want, shall, will, must, need, ought." Icelandic has a parallel set, and they share two awkward properties: most are preterite-present verbs (an ancient class with irregular conjugations you cannot guess), and they split into two camps over a single tiny word — að. Six modals take a bare infinitive (no að); three demand að before the following verb. Getting that split right is the difference between sounding fluent and sounding like you are guessing. And one modal, geta, breaks the pattern entirely by governing the supine instead of the infinitive — a point most textbooks teach wrong or skip. This page orients you; each verb's full paradigm lives on its Verb Reference page.

The two camps: bare infinitive vs að

This is the load-bearing distinction. Internalise the two lists.

The clean five take the verb directly: ég vil fara ("I want to go"), þú mátt koma ("you may come"). The others insert að: þú átt *að fara ("you ought to go"), ég verð að fara ("I must go"), and ég kann að synda* ("I know how to swim"). There is no deep logic that predicts which camp a modal falls in — it is a property of each verb, so learn it as part of the verb.

(A word on kunna: in its everyday "know how to do X" sense it takes að before the following verb — ég kann *að synda, hún kann **að keyra — so for an A2 learner it belongs in the *að camp. You will also meet a barer, more idiomatic kunna in fixed expressions, but the safe, productive pattern is kunna að + infinitive.)

geta governs the SUPINE, not the infinitive

Now the point that distinguishes a careful learner from a sloppy one. Although geta sits in the bare-infinitive camp (no að), it does not take the infinitive at all. It takes the supine — the same indeclinable form you use after the perfect auxiliary hafa (the -ið / -að / -t form). So "I can do it" is ég get gert það, with the supine gert — not the infinitive gera.

This makes geta unique among the modals: every other one takes either a bare infinitive or að + infinitive, but geta alone takes the supine. The mistake of saying ég get gera is extremely common and immediately marks a learner; lock in get + supine now.

The conjugations are irregular (preterite-present)

These verbs descend from an old class whose present tense looks like a past tense and whose forms you cannot derive by rule. You memorise them. Here are the key present-singular and past-singular shapes — note how alien they look:

The vowel changes are dramatic and irreplaceable: geta has present get but past gat; mega has present má (just two letters!) and past mátti. You cannot guess these; treat each cell as a separate vocabulary item.

(A note on kunna: in the sense "know how to do X" it takes kunna að + infinitive — ég kann að synda — so when kunna governs another verb, the að is there. Its companion page covers the finer points; the headline is that kunna is about acquired skill, geta about momentary ability.)

A quick gloss of each meaning

So you can pick the right modal, not just conjugate it:

• geta
  • supine — physical/circumstantial ability ("can, manage to"): ég get komið.
• vilja
  • inf. — desire ("want to"): ég vil borða.
• mega
  • inf. — permission ("may, be allowed"): má ég fara?
• kunna (að) + inf. — acquired skill ("know how to"): hún kann að keyra.
• skulu
  • inf. — commitment/command ("shall, will [definitely]"): ég skal hjálpa þér.
• munu
  • inf. — future/prediction ("will"): þau munu koma.
• eiga að
  • inf. — expectation/duty ("ought to, be supposed to"): ég á að vinna á morgun.
• þurfa að
  • inf. — necessity from need ("need to"): ég þarf að sofa.
• verða að
  • inf. — strong obligation ("must, have to"): þú verður að borða.

Common Mistakes

The signature modal error. Geta takes the supine (gert, farið, synt), patterning like the perfect ég hef gert.

Don't insert að after the bare-infinitive modals (geta, vilja, mega, skulu, munu). Vil fara, not vil að fara.

The obligation modals (eiga, þurfa, verða) need að. Dropping it is as wrong as adding it to the bare camp.

Don't apply regular endings to preterite-present verbs; their forms (má/mátti, get/gat, vil/vildi) are memorised, not derived.

Þurfa is in the að camp: þarft að fara, not þarft fara.

Key Takeaways

• Icelandic modals split into bare-infinitive (geta, vilja, mega, skulu, munu) and að-requiring (eiga að, þurfa að, verða að, and kunna að "know how to"). Learn the camp with the verb.
• geta is special: it governs the SUPINE, not the infinitive — ég get gert það, like the perfect ég hef gert. This is the highest-value point on the page.
• The modals are preterite-present with irregular, unguessable forms: get/gat, vil/vildi, má/mátti, skal/skyldi, mun/myndi, kann/kunni.
• Meaning guide: ability (geta), wish (vilja), permission (mega), skill (kunna), commitment (skulu), future (munu), duty (eiga að), need (þurfa að), obligation (verða að).