People are parasailing on a clear day.
The day is stormy
The day can be either clear or stormy.
exists e1 s1 x1 x2.(on(e1,x2) & n_day(x2) & a_clear(s1) & Theme(s1,x2) & Actor(e1,x1) & v_parasail(e1) & n_people(x1))
exists s1 x1.(n_day(x1) & Theme(s1,x1) & a_stormy(s1))