This person is skiing.
this person is watching TV
One cannot watch TV while skiing.
exists p1 x1.(n_person(x1) & exists x2.((x1 = x2) & n_skiing(x2)))
exists e1 x1 x2.(n_person(x1) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_tv(x2))