A champion sold the boy the drink on a tree .
* boy ( x _ 4 ) ; * drink ( x _ 6 ) ; champion ( x _ 1 ) AND sell . agent ( x _ 2 , x _ 1 ) AND sell . recipient ( x _ 2 , x _ 4 ) AND sell . theme ( x _ 2 , x _ 6 ) AND drink . nmod . on ( x _ 6 , x _ 9 ) AND tree ( x _ 9 )