A boy skateboards down the metal handrail at night.
The boy is standing in the sun.
One cannot be skateboarding and standing at the same. The sun is up during the day, not at night.
exists e1 x1 x2 x3 x4.(n_handrail(x2) & of(x2,x3) & n_metal(x3) & at(e1,x4) & n_night(x4) & down(e1,x2) & Actor(e1,x1) & v_skateboard(e1) & n_boy(x1))
exists e1 x1 x2.(n_sun(x2) & n_boy(x1) & in(e1,x2) & Actor(e1,x1) & v_stand(e1))