A boy looks on as a baby laughs.
A baby is laughing.
If the baby laughs, then it is laughing.
exists e1 e2 x1 x2 x3.(r_on(e1) & as(e1,x2) & Actor(e2,x3) & v_laugh(e2) & (x2 = x3) & n_baby(x2) & Actor(e1,x1) & v_look(e1) & n_boy(x1))
exists e1 x1.(Actor(e1,x1) & v_laugh(e1) & n_baby(x1))