A boy playing with an sweeper.
A boy playing with a truck.
The boy is either playing with an sweeper o he is playing with a truck, he can not be ding both actions at once.
exists e1 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_sweeper(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1))
exists e1 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_truck(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1))