A group of people are looking at the river.
there is people looking the river on sitting  table
Just because the people are looking at the river, it doesn't mean they are doing so sitting at a table.
exists e1 x1 x2 x3.(n_river(x3) & at(e1,x3) & Actor(e1,x1) & v_look(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 x1 x5.(n_river(x5) & exists e2 e1 x2 x3 x4.((x1 = x2) & Time(e1,x5) & on(e1,x4) & n_table(x4) & Actor(e2,x4) & v_sit(e2) & Actor(e1,x3) & v_look(e1) & (x2 = x3) & n_people(x2)))