(1)先生，閣下(respectful form of address to a man)：What can I do for you，～? 先生，我能為您做點什么? Yes，～. 是的，先生(長官)。Dear S～/S～s 親愛的先生/諸位先生(用在正式信函的開頭);〖反〗madam;
(2)爵士或男爵的尊稱(放在名字前)(title put before a man's first name to show that he is a knight or baronet)：Sir Walter Scott/Sir Walter 沃爾特爵士(不能說Sir Scott);〖反〗Lady