A dog runs across the grass.
it is a sunny day.
A dog runs across grass can occur in any weather so it is not proof that it is a sunny day.
exists e1 x1 x2.(n_grass(x2) & across(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists p1 x1.(n_thing(x1) & exists s1 x2.((x1 = x2) & n_day(x2) & a_sunny(s1) & Theme(s1,x2)))