A boy crouching behind some small logs playing paintball.
A child is playing.
A boy is playing paintball so therefore there is a child who is playing.
exists e2 e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & behind(e1,x3) & Theme(e2,x5) & Actor(e2,x4) & v_play(e2) & n_paintball(x5) & (x3 = x4) & n_log(x3) & a_small(s1) & Theme(s1,x3) & Actor(e1,x2) & v_crouch(e1) & (x1 = x2) & n_boy(x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_child(x1))