The sky is blue
The sky is blue, but there is a chance of rain
The sky is blue does not necessarily mean there is a chance of rain.
exists s1 x1.(n_sky(x1) & Theme(s1,x1) & a_blue(s1))
exists p1 s1 x1 x2.(n_sky(x1) & exists x3 x4.((x2 = x3) & of(x3,x4) & n_rain(x4) & n_chance(x3)) & Theme(s1,x1) & a_blue(s1))