People in a dance
The people are doing a mob dance.
You can not infer they are doing mob dance.
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_dance(x2) & n_people(x1))
exists e1 x1 x2 x3.(n_people(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_dance(x2) & of(x2,x3) & n_mob(x3))