There is one man who is sitting on top of a school bus while another man walks down the aisle of the bus.
One man sits on a school bus while one walks inside.
One is sitting or sits while the other one walks.
exists p1 x1 x8.(n_aisle(x8) & exists e1 p2 x2 x3 x4 x5 x6.((x1 = x2) & exists e2 s1 x7.(a_down(s1) & Manner(e2,s1) & Theme(e2,x8) & Actor(e2,x7) & v_walk(e2) & of(x8,x5) & n_man(x7) & -(x7 = x2)) & n_bus(x5) & n_bus(x5) & n_man(x2) & n_man(x2) & while(e1,p2) & on(e1,x4) & of(x4,x5) & of(x5,x6) & n_school(x6) & n_top(x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & card_eq_1(x2)))
exists e1 p1 x1 x2 x3.(exists e2 s1 x4.(a_inside(s1) & Manner(e2,s1) & Actor(e2,x4) & v_walk(e2) & n_thing(x4) & card_eq_1(x4)) & while(e1,p1) & on(e1,x2) & n_bus(x2) & of(x2,x3) & n_school(x3) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & card_eq_1(x1))