A gentleman walking in the street.
The gentleman is sitting at home.
Man cannot be walking in street and sitting at home simultaneously.
exists s1 x1 x2.(n_street(x2) & a_topic(x1) & in(x1,x2) & n_walking(x1) & a_gentleman(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_gentleman(x1) & at(e1,x2) & n_home(x2) & Actor(e1,x1) & v_sit(e1))