A gentleman walking in the street.
There is a man in the street.
man is a gentleman
exists s1 x1 x2.(n_street(x2) & a_topic(x1) & in(x1,x2) & n_walking(x1) & a_gentleman(s1) & Theme(s1,x1))
exists p1 x1 x3.(n_street(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_man(x2)))