Children walking in the rain.
The sun is shining and there is no precipitation.
There cannot simultaneously be rain and no precipitation.
exists x1 x2 x3.(n_rain(x3) & a_topic(x1) & in(x1,x3) & n_walking(x1) & (x1 = x2) & ne_nam_children(x2))
exists e1 p1 x1 x2.(n_sun(x1) & -exists x3.((x2 = x3) & n_precipitation(x3)) & Actor(e1,x1) & v_shine(e1))