William imagined that a mouse said that a boy wanted to clean .
imagine . agent ( x _ 1 , William ) AND imagine . ccomp ( x _ 1 , x _ 5 ) AND mouse ( x _ 4 ) AND say . agent ( x _ 5 , x _ 4 ) AND say . ccomp ( x _ 5 , x _ 9 ) AND boy ( x _ 8 ) AND want . agent ( x _ 9 , x _ 8 ) AND want . xcomp ( x _ 9 , x _ 11 ) AND clean . agent ( x _ 11 , x _ 8 )