When we meet, we will say how are you to each other at the beginning. Next, I will ask you, paper or plastic, because most Americans use paper bags to pack things, while many people in China want plastic bag because they can be used as garbage bags. If what you buy is heavy, they may ask you (do you need )double bag? You just answer yes or no Finally, the cashier will definitely say have a good day! Or say have a good evening in the evening! You can say you too. Or just repeat their greetings. In addition, you may be asked what card to use to pay for credit or debit card. Generally, China people who have just arrived in the United States, especially students, only have debit cards, which is very similar to China's UnionPay cards. Only when they have accumulated certain credit or earned income can they apply for credit cards. After paying by card, you need to sign. Same as in China. Generally, it's signed like a dragon and a phoenix, but it should be consistent with the handwriting on the credit card. Of course, you can also pay cash or check.

to add, you need to show your driver's license to show that you are an adult if you want to buy wine. Many other places don't sell alcohol on Sunday morning, because they think when is the time for worship.