An overweight couple walk down the street.
The people walking to reduce weight.
Walking down the street doesn't necessarily mean they are doing it for exercise.
exists s1 x1 x2 x3.(n_street(x3) & a_topic(x1) & down(x1,x3) & n_walk(x1) & of(x1,x2) & n_couple(x2) & a_overweight(s1) & Theme(s1,x1))
exists e1 p1 x1 x2.(n_people(x1) & a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_walk(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_reduce(e2) & n_weight(x3)) & (x1 = x2))