The young boys are looking for apples that do n't exist.
Children are searching in vain for fruit.
Young boys are the children who are searching for apples.
exists e1 s1 x1 x2 x3.(n_boy(x1) & a_young(s1) & Theme(s1,x1) & for(e1,x2) & -exists e2.(Actor(e2,x3) & v_exist(e2)) & (x2 = x3) & n_apple(x2) & Actor(e1,x1) & v_look(e1))
exists e1 x1 x2 x3.(in(e1,x3) & n_vain(x3) & for(e1,x2) & n_fruit(x2) & Actor(e1,x1) & v_search(e1) & n_child(x1))