for good or for evil

例句：

1. 1.We decided to go to the beach for good and never come back.
   我们决定去海滩，永远不再回来。
2. 2. The couple has been together for eternity, but they still have a long way to go.
   这对夫妇已经在一起很长时间了，但他们还有很长的路要走。
3. 3. For all time, she will be remembered as the greatest singer of all time.
   永远，她将被记住为有史以来最伟大的歌手。