HVORT

Usually tagged WQ, in which case it means "whether" and introduces an indirect question.

( (IP-MAT-SPE (NP-SBJ (PRO-N ég-ég))
	      (VBPI veit-vita)
	      (NEG ekki-ekki)
	      (, ,-,)
	      (CP-QUE-SPE (WQ hvort-hvort)
			  (C 0)
			  (IP-SUB-SPE (NP-SBJ (PRO-N þið-þú))
				      (VBPI kannist-kanna)
				      (PP (P við-við)
					  (NP (PRO-A það-það)))))
	      (. ;-;))
  (ID PILTUR,.1305))

HVORT SEM

See [CP-QUE#Adverbial_WHETHER_questions_.28CP-QUE-ADV.29 Adverbial].

HVORT ... EÐA

See WHETHER OR NO(T) in PPCEME.