John and Mary Everest
"Here are John and Mary." 'Are' is used because "John and Mary" are plural.
Mary Everest Boole died in 1916.
Barbara Everest's birth name is Barbara Mary Everest.
Yes, very!
Mr. John M. Smith and Dr. Mary F. Smith is correct, or John M. and Mary F. Smith, or Mr. & Mrs. John M. Smith. One should never become awkward in usage for the purpose of being politically correct. It simply draws people's attention unnecessarily.
John and Mary, I am going to town, do you want to come too?
The correct statement re completed childbirth education would be: This letter (or document) certifies that John and Mary Smith as of March 2, 2010 have completed their prepared childbirth education classes.
If you mean 'The Ascent of Everest' then that was written by John Hunt, the leader of the British 1953 Mount Everest expedition.
The correct spelling of the proper noun is "Mount Everest" (Mt. Everest).
Mc Mary
John and Mary Smith
dr Mary smith would be the correct way