在英语中,对不同年龄、不同身份的人礼貌的称呼

在英语中,对不同年龄、不同身份的人礼貌的称呼
1.a man,we don't know his first name or last name这时怎样称呼他
2.a woman,we don't know his first name or last name这时怎样称呼他
3.a man, his name is tony这时怎样称呼他
his wife:___________________
4.a lady you don't know whether shi is married or not这时怎样称呼他
急求!谢谢!