The boy in the yellow shirt is skipping stones.
The boy is throwing sticks.
The boy is either skipping stones, or throwing sticks.
exists e1 s1 x1 x2 x3.(n_shirt(x2) & a_yellow(s1) & Theme(s1,x2) & n_boy(x1) & Theme(e1,x3) & Actor(e1,x1) & v_skip(e1) & n_stone(x3) & in(x1,x2))
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_stick(x2))