A group of people cleaning a beach.
A group of people clean their kitchen.
Cleaning a beach does not happen when people clean their kitchen
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_clean(e1) & n_beach(x4) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(r_.(e1) & clean(e1,x4) & n_kitchen(x4) & of(x4,x1) & n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_event(e1) & of(x2,x3) & n_people(x3) & n_group(x2))