A frog served a drink on the bed to a human .
* bed ( x _ 7 ) ; frog ( x _ 1 ) AND serve . agent ( x _ 2 , x _ 1 ) AND serve . theme ( x _ 2 , x _ 4 ) AND serve . recipient ( x _ 2 , x _ 10 ) AND drink ( x _ 4 ) AND drink . nmod . on ( x _ 4 , x _ 7 ) AND human ( x _ 10 )