当你用别人的车时，你应该付汽油钱。
You are supposed to pay the gas bill when you use someone's car.
你绝对不能欠着那些你应该付的电话费。
You should never owe your host family money for unpaid phone bills.
除非邀请你的那个人事先告诉你，你将受到款待，否则，你应该付总账单里你的那份。
You are supposed to pay your own share of the bill, unless the person who invited you told you in advance that you would not be paying.
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