A young boy sits while eating.
A child grabs a bite to eat.
A young boy is a child and eating implies that he grabs a bite to eat.
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 p1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_grab(e1) & Topic(x2,p1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_eat(e2) & n_thing(x3)) & n_bite(x2) & n_child(x1))