  Constituent and dependency representation for syntactic structure share a lot
of linguistic and computational characteristics, this paper thus makes the
first attempt by introducing a new model that is capable of parsing constituent
and dependency at the same time, so that lets either of the parsers enhance
each other. Especially, we evaluate the effect of different shared network
components and empirically verify that dependency parsing may be much more
beneficial from constituent parsing structure.
  The proposed parser achieves new state-of-the-art performance for both
parsing tasks, constituent and dependency on PTB and CTB benchmarks.
