如何优雅地用英语麻烦别人？

当你们初次出国时有没有讲过 I want, I need...等表达？ I want.. a burger, no cheese, no coke give me hot water... I need...a chopstick, give me a chopstick!! 在英语中这可是非常不礼貌的哦，就像你在命令对方帮你做事情一样！ 正确应该怎么说呢？应该用Could you开头，例如： Could you take a picture for me? I will buy this shirt. Can I get a new one please? Can I order my dinner now? 如果想要更礼貌的话，可以用 Would you please... Would you please pass me the bread? Would you