Teen boy playing billiards.
Young person pitching a tent at the campsite.
It is not possible to be playing billiards and pitching a tent at the same time.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_billiards(x4) & (x1 = x3) & n_boy(x1) & (x1 = x2) & ne_nam_teen(x2))
exists e1 s1 x1 x2 x3 x4.(n_campsite(x4) & a_topic(x1) & at(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_pitch(e1) & n_tent(x3) & (x1 = x2) & n_person(x1) & a_young(s1) & Theme(s1,x1))