1994 BMW 318 Car won't go

My son called me last night and said his car woudn't move. He thought it was the clutch. I went to see him thinking I could race shift it and get it home. The thing is the car starts and you can put it in gear, but it doesn't move. No noise. You cannot put it in gear with the engine running unless you press on the clutch as normal. Let the clutch pedal out and the engine accelerates, but the car sits there. You can select any gear, same thing. We towed it home. I always thought if there was a clutch problem you would hear something or have some kind of response. Almost seems as if something has sheared, what do you think.
Thanks
Kevin