A young boy sits while eating.
A boy is fast asleep on the floor.
A person who sits while eating would be awake and upright, whereas a person asleep on a floor would not be awake or typically upright.
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 p1 x1 x2.(n_floor(x2) & on(p1,x2) & exists s1 x3.((x1 = x3) & n_asleep(x3) & a_fast(s1) & Theme(s1,x3)) & n_boy(x1))