A man is sitting on a bench behind a bike.
The girl skis
A man sitting is different from a girl skiing.
exists e1 x1 x2 x3.(behind(e1,x3) & n_bike(x3) & on(e1,x2) & n_bench(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists x1 x2.(n_ski(x1) & of(x1,x2) & n_girl(x2) & a_topic(x1))