Certainly not. We all trooped out into the corridor, leaving the two doctors alone, and I heard the key turned in the lock behind us. 
We left the two doctors alone and locked the door.
We stayed with the doctors.
A pottery class is learning how to use the pottery wheel.
A dog fetches a tennis ball in the open field.
Are we certain that it was chloral?
Have all of the shards of important information been taken into account?
Two men are riding bikes.
Thanks, that's everything.