A woman is kayaking on a lake
A man is kayaking on a lake.
A woman is not a man.
exists e1 x1 x2.(on(e1,x2) & n_lake(x2) & Actor(e1,x1) & v_kayake(e1) & n_woman(x1))
exists e1 x1 x2.(on(e1,x2) & n_lake(x2) & Actor(e1,x1) & v_kayake(e1) & n_man(x1))