"The Cell".

use full-length room descriptions.
The Cell is a room.
"One of the most abysmal places in the world of prisons".

understand the command "lie" as something new.
understand "lie on [something]" as entering.

understand the command "stand" as something new.
standing on is an action applying to one thing.
understand "stand on [something]" as standing on.

instead of standing on the bed,
say "The prison warden would frown highly upon that.".
A thing called a bed is in the Cell.
the bed is an enterable supporter.
the bed is not portable.
The bed is either cornered or middled. 
The bed is cornered. 
The description of the bed is
 "The bed is [if cornered ]standing in one corner of the room.
[otherwise] standing in the middle.[end if]"

Instead of taking the bed, 
say "It's too heavy for you to pick up."

Instead of pulling the bed when the bed is cornered:
say "You pull the bed out into the center of the room.";
change the bed to middled;

Instead of pulling the bed when the bed is middled:
say "You can't pull it any further.";

Instead of pushing the bed:
if the bed is middled begin;
say "You push the bed back into the corner.";
change the bed to  cornered;
otherwise; say "You can't push it any further.";
end if;

Understand the command "move" as something new.
Understand "move [something]" as moving it.
Moving it is an action applying to one thing.

Understand "move [bed]" as pulling when the bed is cornered.
understand "move [bed]" as pushing when the bed is middled.