Three lambs are in a field.
The lambs are eating grass.
Just because there are lambs in a field doesn't mean they are eating grass.
exists p1 x1.(exists x2.(in(x1,x2) & n_field(x2)) & n_lamb(x1) & card_eq_3(x1))
exists e1 x1 x2.(n_lamb(x1) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_grass(x2))