A man and women are on a bus.
A man and woman are playing piano in a bus.
A man and a women on a bus is different from a man and a woman playing piano in a bus.
exists p1 x1 x2 x3.(exists x4.(on(x1,x4) & n_bus(x4)) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists e1 x1 x2 x3 x4 x5.(in(e1,x5) & n_bus(x5) & Theme(e1,x4) & Actor(e1,x1) & v_play(e1) & n_piano(x4) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1))