先做学生，后做先生。

Be a pupil before you become a teacher.

要做人民的先生，先做人民的学生。

To be a teacher of the people, one must first be their pupil.

求求你，先生，能把球还给我们吗？

Please, mister, can we have our ball back?

银行退回了杰克逊先生提交的支票。

A cheque presented by Mr Jackson was returned by the bank.

他给一位明先生当助手。

He worked as an assistant to one Mr Ming.

先生，吃这道菜，我给您推荐一种白葡萄酒，好吗？

May I suggest a white wine with this dish, Sir?

请原谅我多问，那位是您的先生吗？

Pardon my asking, but is that your husband?

很抱歉，沃尔什先生这个星期休假去了。

I'm afraid Mr Walsh is away on holiday this week.

先生，请你瞧瞧这个型号好吗？

Could I interest you in this model, Sir?

陈先生为妻子打开车门。

Mr Chen opened the car door for his wife.

先生，请在酒店登记簿上签字好吗？

Could you sign the hotel register please, sir?

总统先生，您有何评论？

Do you have any comment, Mr President?