MD

Only verbs with modal meaning that take bare infinitives are tagged as MD:

mega 'may', munu 'will', skulu 'shall', vilja 'want, will'

This includes GETA when it functions as a modal and takes a past participle complement, and FÁ when it has the same meaning as GETA and functions the same (see Treatment of individual words). VILJA does not always function as a modal, then it is not tagged MD: Ég vil þetta.

Verbs with modal meaning that take að-marker (to) and an infinitive are not tagged as MD but as main verbs taking IP-INF:

eiga 'ought to', fá 'be allowed to', hljóta 'must', kunna 'can', þurfa 'need to', verða 'must', ætla 'intend'

if a verb that usually takes the að-marker for some reason does not, and does not have modal meaning, it is still parsed as taking IP-INF.

( (IP-MAT (NP-SBJ (PRO-A Hann-hann))
          (VBPI langar-langa)
          (IP-INF (VB fara-fara))))

Infinitive of some pretero-present has a special past marking (Hann sagðist mundu/skyldu gera þetta). This is not tagged especially: we tag it as MD and not MDD.