Elision

Sluicing

( (IP-MAT-SPE (ADVP-TMP (ADV nú-nú))
	      (VBDI skildi-skilja)
	      (NP-SBJ (PRO-N hann-hann))
	      (ADVP (ADV auðvitað-auðvitað))
	      (PP (NP (WPRO-G hvers-hver))
		  (P vegna-vegna))
	      (. .-.))
  (ID 1985.MARGSAGA.NAR-FIC,.1253))

Elision of verbs after modals

See PPCME/PPCEME Guidelines