Expletives
From Icelandic Parsed Historical Corpus (IcePaHC)
The expletive is sometimes not co-indexed with anything, not just in weather expressions.
Það er byggilegt á Íslandi (literally 'It is buildable in Iceland').
( (IP-MAT (NP-SBJ (PRO Það)
(BEP er)
(ADJP (ADJ byggilegt)
(PP (P á) (NP (N Íslandi)))))