A man is lying in the grass.
The man is sleeping in the grass.
You can not infer he is sleeping.
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_lie(e1) & n_man(x1))
exists e1 x1 x2.(n_grass(x2) & n_man(x1) & in(e1,x2) & Actor(e1,x1) & v_sleep(e1))