There is one man who is sitting on top of a school bus while another man walks down the aisle of the bus.
A man is walking down the aisle of the bus to tell the driver someone is sitting on it.
The man may not be walking down the aisle of the bus to tell the driver someone is sitting on top of it.
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 s1 x1 x2 x3 x4 x5.(n_thing(x3) & n_driver(x5) & n_bus(x4) & n_aisle(x3) & Topic(e1,p1) & exists e2 p2.(Theme(e2,x5) & Actor(e2,x1) & v_tell(e2) & exists e3 x6.(on(e3,x3) & Actor(e3,x6) & v_sit(e3) & n_person(x6)) & that(x5,p2)) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & of(x3,x4) & n_man(x2) & n_man(x1))