use of "until"

[hyunminjeong]

hi..

I'm confusing.

1." I also slept continuously when(while) my brother slept."
can you substitute “when(while)” with "until"


2. "I also slept continuously before it rained and even when(while) it rained. and then I got up after it stopped raining."
can you substitute "before it rained and even when(while) it rained" with "until it rained"?


could you let me know... thanks.

[Tdol]

1- It would change the meaning:
I slept until my brother slept = I stopped sleeping when he started.
'Until' marks a limit.
2- Same problem. 'Until it rained' means that you stopped sleeping when it started raining, so you didn't sleep through the rain. How about 'until it stopped raining'?