The baby is holding someone's arm.
The baby isn't holding anything.
Is is the opposite of isn't.
exists e1 x1 x2 x3.(n_baby(x1) & Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_arm(x3) & of(x3,x2) & n_person(x2))
exists x1.(n_baby(x1) & -all x2.(n_thing(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1))))