Middle-age students sitting in rows of tables listening to a teacher sitting in front of room behind desk .
It is highly unlikely that middle-age students sit in rows of tables listening to their teacher who is sitting talk about economics .
It is likely that middle-age students sit in rows of tables listening to their teacher who is sitting talk about economics .
It is highly unlikely that middle-age students sit in rows of tables listening to their teacher who is sitting talk about economics .
Middle-age students sit in rows of tables listening to their teacher who is sitting talk about economics .