Person doing backflips outside in the grass.
A dog doing backflips.
It's either a dog or a person.
exists e1 x1 x2 x3.(n_grass(x3) & ne_nam_person(x1) & in(e1,x3) & r_outside(e1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_backflip(x2))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_backflip(x3) & (x1 = x2) & n_dog(x1))