The rules that use the vocabulary item "this" are:

<det-sing>

this

<det-sing-not_wh_or_gq_or_dummy>

this

<det-sing-deictic>

this

<det>

this

<controller-air_traffic_control>

this is <controller-air_traffic_control-recursive>

<det-sing-not_wh>

this

<controller>

this is <controller-air_traffic_control-recursive>

this is <controller-recursive>