old enough to know better

例句：

1. 1. I know you're going to the party tonight.
   我知道你今晚要去参加派对。
2. 2. He knew what he wanted to do before he left.
   他离开前就知道他想做什么了。
3. 3. She knew that she had made a mistake.
   她知道她犯了一个错误。