Crowds walk along the street.
Crowds are in the street rioting.
walk does not necessarily refer that they are in anything specific.
exists e1 x1 x2.(n_street(x2) & along(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_crowd(x1))
exists p1 x1 x2 x3.(n_rioting(x2) & of(x2,x3) & n_street(x3) & in(x1,x2) & n_crowd(x1))