A couple with shades is walking across a crosswalk.
A couple are sitting in a park having a picnic.
The couple can't be sitting and walking at the same time.
exists e1 x1 x2 x3.(across(e1,x3) & n_crosswalk(x3) & Actor(e1,x1) & v_walk(e1) & with(x1,x2) & n_shades(x2) & n_couple(x1))
exists e2 e1 x1 x2 x3 x4.(in(e1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_have(e2) & n_picnic(x4) & (x2 = x3) & n_park(x2) & Actor(e1,x1) & v_sit(e1) & n_couple(x1))