YOU SAID:
One time when I was on a bed, I was watching TV (that has just appeared magically).
INTO JAPANESE
あるとき、私はベッドの上でテレビを見ていました(それは魔法のように現れました)。
BACK INTO ENGLISH
One time I was watching TV on my bed (it appeared magically).
INTO JAPANESE
あるとき、私はベッドでテレビを見ていました(魔法のように現れました)。
BACK INTO ENGLISH
One time I was watching TV in bed (it appeared magically).
INTO JAPANESE
あるとき、私はベッドでテレビを見ていました(魔法のように現れました)。
BACK INTO ENGLISH
One time I was watching TV in bed (it appeared magically).
You've done this before, haven't you.