Emma served the boy a ball on a tree .
* boy ( x _ 3 ) ; serve . agent ( x _ 1 , Emma ) AND serve . recipient ( x _ 1 , x _ 3 ) AND serve . theme ( x _ 1 , x _ 5 ) AND ball ( x _ 5 ) AND ball . nmod . on ( x _ 5 , x _ 8 ) AND tree ( x _ 8 )