Workers stack blue crates at a dock and seagulls try to see inside them.
Workers are moving crates.
The phrase stack blue crates implies that someone is moving crates.
exists e2 e1 p1 s1 x1 x2 x3 x4.(Topic(e2,p1) & Actor(e2,x4) & v_try(e2) & exists e3.(inside(e3,x1) & Actor(e3,x4) & v_see(e3)) & n_thing(x1) & n_seagull(x4) & at(e1,x3) & n_dock(x3) & Theme(e1,x2) & Actor(e1,x1) & v_stack(e1) & n_crate(x2) & a_blue(s1) & Theme(s1,x2) & n_worker(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_move(e1) & n_crate(x2) & n_worker(x1))