A man wearing glasses and a blue jacket is smiling while men behind him are cooking on a grill.
A man is having a good time at a barbecue.
Cooking on a grill is not always a barbecue.
exists e1 e2 p1 s1 x1 x2 x3 x4 x5.(exists e3 x6 x7.(on(e3,x7) & n_grill(x7) & Actor(e3,x6) & v_cook(e3) & behind(x6,x2) & n_man(x6)) & n_male(x2) & while(e2,p1) & Actor(e2,x1) & v_smile(e2) & subset_of(x5,x1) & n_jacket(x5) & a_blue(s1) & Theme(s1,x5) & subset_of(x2,x1) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_glass(x4) & (x2 = x3) & n_man(x2))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & at(x2,x3) & n_barbecue(x3) & n_time(x2) & a_good(s1) & Theme(s1,x2) & n_man(x1))