The coach proved that the drink was fed to the boy by a girl .
* coach ( x _ 1 ) ; * drink ( x _ 5 ) ; * boy ( x _ 10 ) ; prove . agent ( x _ 2 , x _ 1 ) AND prove . ccomp ( x _ 2 , x _ 7 ) AND feed . theme ( x _ 7 , x _ 5 ) AND feed . recipient ( x _ 7 , x _ 10 ) AND feed . agent ( x _ 7 , x _ 13 ) AND girl ( x _ 13 )