A gentleman walking in the street.
Worker constructing streets
If worker is in street constructing, he cannot be walking in street.
exists s1 x1 x2.(n_street(x2) & a_topic(x1) & in(x1,x2) & n_walking(x1) & a_gentleman(s1) & Theme(s1,x1))
exists x1 x2 x3.(n_street(x1) & of(x1,x3) & n_constructing(x3) & (x1 = x2) & ne_nam_worker(x2) & a_topic(x1))