Stanley: Here! Here! Use my card!
Ryan: No you don't! I should treat my new brother-in-law!
Stanley: Not on my life! I'm the best man, so I pay!
Ryan: OK, OK. On one condition.
Stanley: What's that?
Ryan: You come back here with me tomorrow, and it's my treat!
Stanley: You've got it! But are we coming back for the music, or for the fruit?!

brother-in-law (n.) 　
大（小）舅子，姐（妹）夫。美语中的亲戚不分父方或是母方，in-laws是「姻亲」，如「岳父，丈人」就是father-in-law

Not on my life! 　
在我这辈子别想！意即「不可能」

condition (n.) 　
条件
A: Can you help me with my homework?
你能帮我写作业吗？
B: On one condition: you have to wash the dishes!
有一个条件：你得要洗碗！

It's my treat. 　
我请客。
A: That was a fantastic meal! How much is the bill?
这餐真好吃！多少钱？
B: It's my treat!
我请客！

You've got it. 　
一般有「没问题。」或是「你说对了。」两种意思，需视对话的前后文而定

史丹利：这里！……用我的卡！
雷　恩：不行！我应该要请我未来的妹夫！
史丹利：只要我还活着就别想！我可是伴郎，我来付帐！
雷　恩：好啦……可是有一个条件。
史丹利：什么条件？
雷　恩：你明天和我再来一次，我请客！
史丹利：没问题！不过我们是再来唱歌的，还是来吃水果的呀？