A girls is jumping in the sand.
A girl rides a bicycle on the sidewalk.
One either rides or is jumping.
exists e1 x1 x2.(n_sand(x2) & in(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_girl(x1))
exists e1 x1 x2 x3.(n_sidewalk(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & on(x2,x3) & n_bicycle(x2) & n_girl(x1))