A person is working in the garden.
people sitting by beach
People implies more than one person, and they are sitting by a beach not working in the garden.
exists e1 x1 x2.(n_garden(x2) & in(e1,x2) & Actor(e1,x1) & v_work(e1) & n_person(x1))
exists e1 x1 x2 x3.(a_topic(x1) & by(e1,x3) & n_beach(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))