Several birds flying in front of trees.
Birds are looking for food to eat.
Birds flying in front of trees are not always looking for food to eat.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & of(x3,x4) & n_tree(x4) & n_front(x3) & Actor(e1,x2) & v_fly(e1) & (x1 = x2) & n_bird(x1) & a_several(s1) & Theme(s1,x1))
exists e1 p1 x1 x2 x3.(Topic(e1,p1) & exists e2.(Actor(e2,x1) & v_eat(e2)) & for(e1,x3) & n_food(x3) & Actor(e1,x2) & v_look(e1) & n_bird(x2) & n_bird(x1))