A gentleman walking in the street.
There is a gentleman walking.
the gentleman in the street is waliking
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 s1 x2.((x1 = x2) & n_walking(x2) & a_gentleman(s1) & Theme(s1,x2))