1) if a woman is married, but did not take husband's last name. Is she Mrs. or Ms.?
2) If a person is invited with their signifiant other, do you still write that person's name on the outer envelope if they don't live at that address? (I have inner envelopes too)
3)If a person is divorced but kept ex-husband's last name, are they Mrs. or Ms.?
4) If you are giving a person a plus one (but they don't have a significant other), do you write "and guest" on outer envelope or inner envelope? or both?