An onlooker sits on the shore of a pool overlooked by massive waterfalls.
An onlooker is sitting.
Sitting and sits is the same form of action.
exists e2 e1 s1 x1 x2 x3 x4 x5.(n_shore(x2) & on(e1,x2) & of(x2,x3) & Actor(e2,x5) & n_waterfall(x5) & a_massive(s1) & Theme(s1,x5) & Theme(e2,x4) & v_overlook(e2) & (x3 = x4) & n_pool(x3) & Actor(e1,x1) & v_sit(e1) & n_onlooker(x1))
exists e1 x1.(Actor(e1,x1) & v_sit(e1) & n_onlooker(x1))