People dancing in front of instructor
While the people are dancing, the instructor is critiquing them.
The people are dancing in front of the instruction but he or she is not necessarily critiquing them.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & of(x3,x4) & n_instructor(x4) & n_front(x3) & Actor(e1,x2) & v_dance(e1) & (x1 = x2) & n_people(x1))
exists p1 p2 p3 x1 x2.(n_thing(x1) & n_instructor(x2) & n_people(x1) & exists e2.(Theme(e2,x1) & Actor(e2,x2) & v_critique(e2)) & exists e1.(Actor(e1,x1) & v_dance(e1)) & while(p2,p3))