I'm writing a paper on extraposition in English (and other right-branching discontinuities). I have found a lot of interesting theory on this but the instructions say that if possible concrete corpus research is to be conducted. I've had some experiences with corpora before, but they aren't really good for analysing syntactic phenomena in my experience. I did some research online and discovered that Treebanks could perhaps help me. Do any of you know any good syntactic treebanks and search tools I could use?