Crowds walk along the street.
The crowds are their to support a cause.
The fact that crowds are walking along a street does not imply that they are doing it to support a cause or for any other reason.
exists e1 x1 x2.(n_street(x2) & along(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_crowd(x1))
exists p1 x1.(n_crowd(x1) & exists e1 e2 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_support(e2) & n_cause(x4) & Time(x1,x3) & n_their(x3) & Actor(e1,x2) & v_be(e1) & (x1 = x2)))