A man stands guard overlooking a lake.
A man is at home sleeping.
a man cannot stand guard if he is at home sleeping.
exists e1 e2 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_overlook(e2) & n_lake(x3) & Time(e1,x2) & n_guard(x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1))
exists p1 x1.(exists x2 x3.(at(x1,x2) & n_sleeping(x2) & of(x2,x3) & n_home(x3)) & n_man(x1))