A：I'm sorry, but I can't find the book you lent me. I guess I have lost it.
很抱歉，我找不到你借给我的那本书了。我想我是给丢了。
B：Don't worry about it.
别担心了。
A：I really feel bad about it. Let me buy you a new one.
对此我真的很抱教。让我再给你买本新的吧。
B：No. Don't be silly. I wouldn't dream of letting you do that.
不用了，别这么傻。我不会让你那么做的。