The category "<user_dialog_command-command>" can be expressed as follows:

<user_dialog_command-command>

<assertion-command-existence_claim>

<beg_pardon_command>

<existence_claim-inv-gapsout_null-gapsin_null>

<np-gapsout_null-gapsin_null-wh-pl> <existence_claim-pl-inv-gapsout_null-gapsin_np_gap>

<np-gapsout_null-gapsin_null-wh-sing> <existence_claim-sing-inv-gapsout_null-gapsin_np_gap>

i <mean_verb> <response_utterance-discourse_command>