The category "<action_query-system_utterance>" can be expressed as follows:
<np-gapsout_null-gapsin_null-wh> should <basic_nl_command-system_utterance-gapsout_null-gapsin_np_gap>
<np-gapsout_null-gapsin_null-wh> should i <system_operation-system_utterance-gapsout_null-gapsin_np_gap>
<pp-wh> should <basic_nl_command-system_utterance-gapsout_null-gapsin_pp_gap>