A group of bicyclists are crossing a bridge.
A man on a bike rides through the grass.
you cannot be crossing a bridge and riding through grass at the same time.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_cross(e1) & n_bridge(x3) & of(x1,x2) & n_bicyclist(x2) & n_group(x1))
exists e1 x1 x2 x3.(n_grass(x3) & through(e1,x3) & Actor(e1,x1) & v_ride(e1) & on(x1,x2) & n_bike(x2) & n_man(x1))