A girl is singing while jumping in the air.
A girl is jumping in the air while singing.
Both subjects are jumping
exists e2 e1 x1 x2.(n_air(x2) & while(e1,e2) & in(e2,x2) & Actor(e2,x1) & v_jump(e2) & Actor(e1,x1) & v_sing(e1) & n_girl(x1))
exists e2 e1 x1 x2.(n_air(x2) & while(e1,e2) & Actor(e2,x1) & v_sing(e2) & in(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_girl(x1))