I would like to express my gratitude to the people without whom this thesis would not exist.First and foremost, I would like to thank my supervisor, Marcel den Dikken, for all his intellectual and moral support. He has always been there when I needed his help and I owe to him most of what I know about syntax. He inspired me with his knowledge of linguistics and never-ending interest in seemingly all linguistic topics, and I could have never made it to this point without his guidance.I am immensely grateful to my committee: Krisztina Szécsényi, Maria Polinsky, Éva Dékány and Mark Newson, who have always been willing to read numerous versions of the thesis and whose questions and commentaries made the final work possible. If there are any good ideas in this thesis they were inspired by these people.I am lucky to have had the opportunity to meet and talk to incredible people whose ideas and suggestions inspired me and contributed to this project. Of the many people who helped me along the way, I am extremely thankful to Katalin É. Kiss, Balázs Surányi, Scott