Liam meant that Sophia rolled a teacher on a seat .
mean . agent ( x _ 1 , Liam ) AND mean . ccomp ( x _ 1 , x _ 4 ) AND roll . agent ( x _ 4 , Sophia ) AND roll . theme ( x _ 4 , x _ 6 ) AND teacher ( x _ 6 ) AND teacher . nmod . on ( x _ 6 , x _ 9 ) AND seat ( x _ 9 )