A boy chases after a bird on a pier.
The boy is trying to catch the seagull.
chases after a bird on a pier doesn't also mean to catch the seagull.
exists e1 x1 x2 x3.(after(e1,x2) & on(x2,x3) & n_pier(x3) & n_bird(x2) & Actor(e1,x1) & v_chase(e1) & n_boy(x1))
exists e1 p1 x1 x2.(n_seagull(x2) & n_boy(x1) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_catch(e2)))