Background: In all dialects:
   The frequency of final rises was affected by the number
of syntactic or lexical cues to interrogativity in
questions.
   Four types of utterances (read speech):
     Declaratives
     Wh-questions   [2 cues: word order and “who”, “what”, …]
     Yes/no (polar) questions  [1 cue: word order]
     Declarative questions [0 lexical/syntactic cues]
acoustic cues must be important.