Boy in red vest and blue and white trunks on wakeboard.
The boy is having fun.
boy on wakeboard need not be having fun
exists s1 s2 s3 s4 x1 x2 x3.(ne_nam_boy(s1) & a_topic(s1) & in(s1,x1) & on(x1,x3) & n_wakeboard(x3) & n_trunk(x1) & a_white(s4) & Theme(s4,x1) & a_blue(s3) & Theme(s3,x1) & of(x1,x2) & n_vest(x2) & a_red(s2) & Theme(s2,x1))
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_fun(x2))