A man performing tricks on a wakeboard in the middle of a large lake.
A man is at the lake.
If you are in the middle of a large lake then you are at the lake
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_middle(x5) & a_topic(x1) & in(e1,x5) & of(x5,x6) & n_lake(x6) & a_large(s1) & Theme(s1,x6) & on(e1,x4) & n_wakeboard(x4) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_trick(x3) & (x1 = x2) & n_man(x1))
exists p1 x1 x2.(n_lake(x2) & at(x1,x2) & n_man(x1))