The water is very calm.
The water is in a lake.
Not all water is in a lake.
exists s1 x1.(n_water(x1) & r_very(s1) & Theme(s1,x1) & a_calm(s1))
exists p1 x1.(n_water(x1) & exists x2.(in(x1,x2) & n_lake(x2)))