A group of people are watching the fireworks.
People have a barbeque.
The people cannot be watching fireworks and have a barbeque at the same time
exists e1 x1 x2 x3.(n_firework(x3) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_barbeque(x2) & n_people(x1))