MD

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

gera/gjöra 'do' (found in Old(er) Icelandic), 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 bare infinitive takes the að-marker, it is still marked as MD and vice versa, i.e. if a verb that usually takes the að-marker for some reason does not, it is still parsed as taking IP-INF.