People sitting in a busy restaurant.
People in a restaurant.
Sitting is a form of being in.
exists e1 s1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_restaurant(x3) & a_busy(s1) & Theme(s1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_restaurant(x2) & n_people(x1))