A boy is surrounded by pigeons.
The boy is underwater.
Pigeons do not act underwater.
exists e1 x1 x2.(Actor(e1,x2) & n_pigeon(x2) & Theme(e1,x1) & v_surround(e1) & n_boy(x1))
exists s1 x1.(n_boy(x1) & Theme(s1,x1) & a_underwater(s1))