A group of people race across a grass field.
A group of people are walking across a field
The people cannot simultaneously be racing and walking
exists e1 x1 x2 x3 x4.(across(e1,x3) & n_field(x3) & of(x3,x4) & n_grass(x4) & Actor(e1,x1) & v_race(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(across(e1,x3) & n_field(x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_people(x2) & n_group(x1))