omg美语：0626 OMG! 美语 Pay the Bill!

怎么用美语买单？  1) Here's the check. I'll take it when you're ready.账单在这里。等你们好了，我会回来拿。2) How much of a tip should I leave?我应该给他付多少小费？3) I usually leave about 20% 我平常付20％小费。