People are walking in the street.
A group of humans are walking in the street.
Group of humans is another way to say people.
exists e1 x1 x2.(n_street(x2) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2 x3.(n_street(x3) & in(e1,x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_human(x2) & n_group(x1))