先生用英文表达是：sir.
例句：
Excuse me sir, but would you mind telling me what sort of car that is?
对不起，先生，您能告诉我那是什么样的汽车吗？
扩展资料
“Dear Sir,” she began.
“尊敬的先生”，她开始写到。
“A pleasure to meet you, sir,” he said.
“很荣幸见到您，先生，”他说。
Could I interest you in this model, Sir?
先生，请你瞧瞧这个型号好吗？
“We shall, sir,” said Thorne, with conviction.
索恩坚定地说：“先生，我们会的”。
Could you sign the hotel register please, sir?
先生，请在酒店登记簿上签字好吗？
