Two men checking their barbecue in an oversized barbecue barrel.
A picnic is taking place with barbecue as the main dish.
The barbecue may not be for a picnic.  Barbecue is not always the main dish.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_check(e1) & in(x3,x4) & n_barrel(x4) & of(x4,x3) & n_barbecue(x3) & n_barbecue(x3) & a_oversized(s1) & Theme(s1,x4) & of(x3,x1) & n_thing(x1) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3 x4.(n_dish(x4) & a_main(s1) & Theme(s1,x4) & as(e1,x4) & with(e1,x3) & n_barbecue(x3) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_place(x2) & n_picnic(x1))