HELDUR
From Icelandic Parsed Historical Corpus (IcePaHC)
HELDUR
HELDUR is ADVR; where it means "but", we assume there is a silent "but" or no conjunction.
HELDUR EN
HELDUR EN + IP-INF requires TO, so add an empty one if missing.
(ADVP (ADVR heldur-heldur) (PP (P en-en) (IP-INF (TO *) (VB sjá-sjá) (NP-OB1 (N-A son-sonur) (NP-POS (PRO-A sinn-sinn))) (ADJP-SPR (ADJ-A píndan-píndur)))))
This is consistent with the English corpora:
( (IP-MAT (NP-SBJ (PRO he)) (MD will) (DO do) (NP-OB1 (Q anie) (N thing)) (ADVP (ADVR rather) (PP (P then) (IP-INF (TO *) (VB lose) (NP-OB1 (PRO$ his) (N liveing)))))