To better cover the question sentences, we further re-define the semantic head finder rules to fit our needs.
the rules to find the semantic head word of phrases SBARQ (Clause introduced by subordinating conjunction), SQ (subconstituent of SBARQ excluding wh-word or whphrase), VP (verb phrase) and SINV (declarative sentence with subject-aux inversion) are redefined, with the head preference of noun or noun phrase rather than verb or verb phrase.