Workers at a construction site.
Male and female workers are at the construction site.
Workers are not necessarily male and female and could be all male or all female.
exists x1 x2 x3.(a_topic(x1) & at(x1,x2) & n_site(x2) & of(x2,x3) & n_construction(x3) & n_worker(x1))
exists p1 s1 x1 x2 x3 x4.(n_site(x3) & of(x3,x4) & n_construction(x4) & at(x1,x3) & n_worker(x1) & a_female(s1) & Theme(s1,x1) & (x1 = x2) & ne_nam_male(x2))