1. Sometimes I see people use H.E Mrs. ABC, for example, but sometimes I see them use H.E. Madam ABC. Are these two usages the same? 2. Can I also use H.E Miss ABC if she is single or H.E Ms. if her marital status is unknown? 3. But why don't we just use Her Excellency right away instead of use H.E Mrs. or H.E Madam .. ? 4. And if I address many high-ranking people in the government, can I use Their Excellencies ? or Your Excellencies(Excellencies here as plural like this?) 5. Some even use this phrase to welcome high-ranking people who walking into a seminar room: "Welcome to the Seminar H.E. The Chairs (plural)" because there are many of them coming. How can they use like that : H.E. The Chairs? Is this usage according to standard grammar or not? Or grammar does not work here? And so it is spoken use? But it is used during formal situation with high-ranking people!!? 6. And if I introduce myself to the seminar and I am one of the high-ranking people, can I use "I am My Excellency ABC.. or Excellency ABC.." Thank you any of you who help me with these usages. P.S: In my country, people like to use such saluting words a lot although I myself do not really but have to learn because need to speak during English-medium meetings/seminars.