People are using conveyor belts to go up or down.
People watching T.V.
The people cannot simultaneously be watching TV and using conveyor belts
exists e1 p1 x1 x2 x3.(Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & (exists e2 s1.(a_up(s1) & Manner(e2,s1) & Actor(e2,x1) & v_go(e2)) | exists e3 s2.(a_down(s2) & Manner(e3,s2) & Actor(e3,x1) & v_go(e3))) & n_belt(x2) & of(x2,x3) & n_conveyor(x3) & n_people(x1))
exists e1 x1 x2 x3.(ne_nam_t.v(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_watch(e1) & (x1 = x2) & n_people(x1))