[实例] 1. Don't tell him the bad news until he finishes his exam. 等他考试完了再告诉他这个坏消息。 2. The secret was not discovered until he was dead. 直到他死后这个秘密才被人发现。 3. I won't stop shouting until you let me go. 你让我走我才停止叫喊。
[实战练习] A: I heard that Bill got divorced. 听说比尔离婚了。 B: Yes, he is really sad now. 是的,他现在很伤心。 A:I thought he wanted to get divorced because he didn't love his wife anymore. 我原以为他想离婚是因为他再也不爱他妻子了。 B: Yes, but he didn't realize how much he needed her until they got divorced. 是的。但离婚后他才发现有多需要她。 A: Yeah. Well now it’s too late. She already has another husband. 是啊。但现在太晚了。她已经有个老公了。 B: That's too bad. Sometimes people often don't appreciate what they have until they lose it. 真遗憾。人们总是在失去后才懂得珍惜。