People are getting their clothes cleaned.
people swimming in the river
Cleaning clothes is different from swimming. Cleaning may not necessarily be done in a river.
exists e1 e2 x1 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_get(e2) & Theme(e1,x3) & v_clean(e1) & (x2 = x3) & n_clothes(x2) & of(x2,x1) & n_thing(x1) & n_people(x1))
exists e1 x1 x2 x3.(n_river(x3) & a_topic(x1) & in(e1,x3) & Actor(e1,x2) & v_swim(e1) & (x1 = x2) & n_people(x1))