L: Americans really know how to party!
D: You can say that again! I really can't drink anymore!
L: Me neither. I heard they're still planning to go KTV afterwards.
D: As much as I love singing, I'll have to pass this time.
I'll have to pass. 就是这次得错过，不能去的意思，你也可以说：Maybe next time!
Surround yourself in English. Put yourself in an all English speaking environment where you can learn passively. The best way to learn is through speaking.