A young boy sits while eating.
A boy sits while eating ice cream..
The fact that a boy is eating doesn't imply that he is eating ice cream.
exists e1 e2 s1 x1.(while(e1,e2) & Actor(e2,x1) & v_eat(e2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 e2 x1 x2 x3.(while(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_eat(e2) & n_cream..(x2) & of(x2,x3) & n_ice(x3) & Actor(e1,x1) & v_sit(e1) & n_boy(x1))