I won't go until I'm good and ready.
我要完全准备就绪后才走。
By law, you are a child until you are 18.
按照法律规定，18岁之前是未成年人。
It took time until the political situation had normalized.
政治局势过了很长时间才恢复正常。
No decision will be taken on the matter until next week.
到下星期才会对这一问题作出决定。
Things were going fine until you showed up.
你一露面就把事情搞糟了。