A group of people stand by a body of water.
Researchers investigate a hazardous waste spill
A group of people standing by a body of water are not necessarily researchers investigating a harzardous waste spill.
exists e1 x1 x2 x3 x4.(by(e1,x3) & of(x3,x4) & n_water(x4) & n_body(x3) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_investigate(e1) & n_spill(x2) & of(x2,x3) & n_waste(x3) & a_hazardous(s1) & Theme(s1,x2) & n_researcher(x1))