A man in shorts is using a barbecue grill in a yard.
The grill uses propane or charcoal.
Even though the man is using a barbecue grill does not mean the grill uses propane or charcoal.
exists e1 x1 x2 x3 x4 x5.(in(e1,x5) & n_yard(x5) & Theme(e1,x3) & Actor(e1,x1) & v_use(e1) & n_grill(x3) & of(x3,x4) & n_barbecue(x4) & in(x1,x2) & n_shorts(x2) & n_man(x1))
exists e1 x1 x2.(n_grill(x1) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & (n_propane(x2) | n_charcoal(x2)))