Empty categories in sentence processing

I tiakina i:
Ngā taipitopito rārangi puna kōrero
Kaituhi matua: Featherston, Sam
Kaituhi rangatōpū: ebrary, Inc
Hōputu: Tāhiko īPukapuka
Reo:Ingarihi
I whakaputaina: Amsterdam ; Philadelphia : J. Benjamins, c2001.
Rangatū:Linguistik aktuell ; Bd. 43.
Ngā marau:
Urunga tuihono:An electronic book accessible through the World Wide Web; click to view
Ngā Tūtohu: Tāpirihia he Tūtohu
Kāore He Tūtohu, Me noho koe te mea tuatahi ki te tūtohu i tēnei pūkete!
Whakaahuatanga
Whakaahuatanga ōkiko:xiii, 277 p. : ill.
Rārangi puna kōrero:Includes bibliographical references (p. [261]-274) and index.