The water is very calm.
The water is not calm.
The water cannot be very calm and not calm at the same time.
exists s1 x1.(n_water(x1) & r_very(s1) & Theme(s1,x1) & a_calm(s1))
exists x1.(n_water(x1) & -exists s1.(Theme(s1,x1) & a_calm(s1)))