A person is snowboarding on a bright day.
A man is snowboarding.
Person does not imply man.
exists e1 s1 x1 x2.(on(e1,x2) & n_day(x2) & a_bright(s1) & Theme(s1,x2) & Actor(e1,x1) & v_snowboard(e1) & n_person(x1))
exists e1 x1.(Actor(e1,x1) & v_snowboard(e1) & n_man(x1))