MD
From Icelandic Parsed Historical Corpus (IcePaHC)
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 (see Treatment of individual words).
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 (mundi/skyldi). This is not tagged especially: we tag it as MD and not MDD.