A young boy standing a leaf littered yard in front of two mailboxes is holding a leaf blower.
Nobody is standing
Either a young boy is standing or nobody, but not both.
exists e3 e1 e2 s1 x1 x2 x3 x4 x5 x6 x7 x8.(Theme(e3,x7) & Actor(e3,x1) & v_hold(e3) & n_blower(x7) & of(x7,x8) & n_leaf(x8) & in(e1,x5) & of(x5,x6) & n_mailbox(x6) & card_eq_2(x6) & n_front(x5) & n_yard(x3) & Theme(e2,x3) & v_litter(e2) & of(x3,x4) & n_leaf(x4) & Time(e1,x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
-exists e1 x1.(Actor(e1,x1) & v_stand(e1) & n_person(x1))