People walk on the beach cleaning up by putting trash in trash bags.
The helicopter pilot carefully lands on the hospital's helipad.
People refers to more than one person but a helicopter pilot is a single person. One cannot be on the beach and on a hospital's helipad at the same time.
exists e1 e3 e2 s1 x1 x2 x3 x4 x5.(n_beach(x2) & by(e2,e3) & in(e3,x4) & n_bag(x4) & of(x4,x5) & n_trash(x5) & Theme(e3,x3) & Actor(e3,x1) & v_put(e3) & n_trash(x3) & for(e1,e2) & a_up(s1) & Manner(e2,s1) & Actor(e2,x1) & v_clean(e2) & on(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 s1 x1 x2 x3 x4.(n_helipad(x4) & of(x4,x3) & n_hospital(x3) & n_pilot(x1) & of(x1,x2) & n_helicopter(x2) & a_carefully(s1) & Manner(e1,s1) & on(e1,x4) & Actor(e1,x1) & v_land(e1))