A boy cleaning up garbage
The boy is playing in the ground.
One can't be playing and cleaning.
exists e1 s1 x1 x2 x3.(a_topic(x1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_clean(e1) & n_garbage(x3) & (x1 = x2) & n_boy(x1))
exists e1 x1 x2.(n_ground(x2) & n_boy(x1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))