A group of people posing for a picture on the grass.
They are on motorcycles.
Motorcycles belong on the road, not on grass.
exists e1 x1 x2 x3 x4 x5.(n_grass(x5) & a_topic(x1) & of(x1,x2) & for(e1,x4) & on(x4,x5) & n_picture(x4) & Actor(e1,x3) & v_pose(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists p1 x1.(n_thing(x1) & exists x2.(on(x1,x2) & n_motorcycle(x2)))