The sky is blue
The moon is out and it's raining.
the sky cannot be blue while it's raining.
exists s1 x1.(n_sky(x1) & Theme(s1,x1) & a_blue(s1))
exists e1 s1 x1.(n_thing(x1) & n_moon(x1) & Actor(e1,x1) & v_rain(e1) & Theme(s1,x1) & a_out(s1))