在西方朋友们一块儿就餐时是不是谁点菜谁付款

It depends. Usually if you invite someone to dinner and you are the host you are expected to pay, unless you tell them in advance you will "go dutch" and split the bill 50-50. Sometimes you will agree somebody will buy the food, the other person will by the drinks. If it is a business lunch you would always pay for your customer. If a family goes to dinner usually the father pays, unless the children are older and working then they might pay.

Note that not all westerner's will pay even if they invite you, so I always make sure I have some money in case they expect me to pay for myself. This is not polite but some people do this.

Most commonly I think good friends will usually "go dutch" and split the bill 50-50. However sometimees you will agree that one time you will buy dinner, and the next time the other person will buy dinner.

Usually if you are a man and you have a girlfriend you will always pay for her meal, but some peo