EF

Introducing adverbial clause

EF 'if', tagged as P; it introduces an adverbial clause (like ÞEGAR often does)

( (IP-MAT (ADVP (ADV Nú-nú))
	  (PP-LFD (P ef-ef)
		  (CP-ADV (C 0)
			  (IP-SUB (NP-SBJ (PRO-N ér-þú))
				  (MDPI vilið-vilja)
				  (ADVP (ADV þó-þó))
				  (PP (P að-að)
				      (NP (PRO-D hvoru-hvor)))
				  (VB taka-taka)
				  (PP (P við-við)
				      (NP (N-D kenningu-kenning)))
				  (ADVP (ADV hugþekklega-hugþekklega) (CONJ og-og) (ADV lítillátlega-lítillátlega))
				  (, ,-,)
				  (PP (P þótt-þótt)
				      (CP-ADV (C 0)
					      (IP-SUB (NP-SBJ *pro*)
						      (NEG eigi-ekki)
						      (BEPS sé-vera)
						      (PP (P með-með)
							  (NP (NS-D forkunnarorðum-forkunnarorð)))
						      (RP fram$-fram)
						      (VAN $færð-færa)))))))
	  (, ,-,)
	  (ADVP-RSP (ADV þá-þá))
	  (MDPI mun-munu)
	  (NP-SBJ (NPR-N Guð-guð)
...
  (ID 1150.HOMILIUBOK.REL-SER,.10))

C is often empty with EF but it can also be overt, like in the example below:

( (IP-MAT-SPE (PP-LFD (P ef-ef)
		      (CP-ADV (C að-að)
			      (IP-SUB (NP-SBJ (N-N mark$-mark)
					      (D-N $ið-hinn)
					      (NP-POS (PRO-N mitt-minn)))
				      (BEPI er-vera)
				      (PP (P á-á)
					  (NP (PRO-D henni-hún))))))
	      (, ,-,)
	      (ADVP-RSP (ADV þá-þá))
	      (VBPI Á-EIGA)
	      (NP-SBJ (PRO-N ég-ég))
	      (NP-OB1 (PRO-A hana-hún))
	      (, ,-,)
	      (NP-ADV (OTHER-G annars-annars) (NEG ekki-ekki))
	      (. .-.)))

Introducing indirect question

			      (IP-SUB (IP-SUB (NP-SBJ (PRO-N þeir-hann))
					      (VBDI fóru-fara)
					      (PP (P til-til)
						  (NP (N-G fundar-fundur)))
					      (PP (P við-við)
						  (NP (PRO-A hann-hann))))
				      (CONJP (CONJ og-og)
					     (IP-SUB (NP-SBJ *con*)
						     (VBDI spurðu-spyrja)
						     (, ,-,)
						     (CP-QUE (WQ ef-ef)
							     (C 0)
							     (IP-SUB (NP-SBJ (PRO-N hann-hann))
								     (BEDS væri-vera)
								     (NP-PRD (NPR-N Kristur-kristur)))))))))
	  (. .-.)))

EF EKKI

Treated as taking FRAG, cf. PPCEME

							   (CP-QUE (WADVP-2 (WADV hvenær-hvenær))
								   (IP-SUB (ADVP-TMP *T*-2)
									   (NP-SBJ *pro*)
									   (MDDS skyldi-skulu)
									   (VB skarta-skarta)
									   (, ,-,)
									   (PP (P ef-ef)
									       (CP-ADV (C 0)
										       (FRAG (NEG ekki-ekki)
											     (PP (P þegar-þegar)
												 (CP-ADV (C 0)
													 (IP-SUB (NP-SBJ (N-N höfuðsmaður-höfuðsmaður))
														 (BEDI var-vera)
														 (VBN kominn-koma))))))))))))))
	  (. ?-?)))