Happy man grilling meat on his barbecue.
The grill is not being used.
either a man  is grilling or not
exists e1 s1 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_barbecue(x3) & of(x3,x1) & n_male(x1) & n_meat(x1) & Actor(e1,x1) & v_grill(e1) & of(x1,x2) & n_man(x2) & a_happy(s1) & Theme(s1,x1))
exists x1.(n_grill(x1) & -exists e1.(Theme(e1,x1) & v_use(e1)))