The polite way to ask for something in Mandarin Chinese is to preface your request with máfan nǐ. This translates as “May I trouble you to….”
Máfan 麻煩 has two characters and nǐ 你 is a single character meaning “you.” Both characters of máfan have the meaning of “to bother,” and together they mean “trouble” or “troublesome.”
Examples of Máfan Nǐ
Máfan nǐ gěi wǒ yī bēi kāishuǐ.
May I trouble you to give me a glass of water.
Máfan nǐ gàosu tā wǒ mǎshàng lái.
May I trouble you to tell him I’m coming immediately.