a bird lands on a man's glove.
An eagle lands on the man's glove.
The bird is either an eagle or not.
exists e1 x1 x2 x3.(on(e1,x3) & n_glove(x3) & of(x3,x2) & n_man(x2) & Actor(e1,x1) & v_land(e1) & n_bird(x1))
exists s1 x1 x2 x3.(n_glove(x3) & of(x3,x2) & n_man(x2) & a_topic(x1) & on(x1,x3) & n_land(x1) & a_eagle(s1) & Theme(s1,x1))