a baby wearing a helmet is playing with a yellow truck.
A baby is having an operation.
A baby having an operation would not be playing with a yellow truck
exists e1 e2 s1 x1 x2 x3 x4.(with(e2,x4) & n_truck(x4) & a_yellow(s1) & Theme(s1,x4) & Actor(e2,x1) & v_play(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_helmet(x3) & (x1 = x2) & n_baby(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_operation(x2) & n_baby(x1))