I live in Sweden where titles are not used at all. People are simply First Name Last Name. This means that it is often difficult for Swedish speakers of English to navigate the world of personal titles in English.
So, to summarise
– Mr (not Mr. and not mr) means Mister or Master (if you are a boy)
– Miss (not Miss. not miss) means you are unmarried
– Mrs tends to be tricky so I tend to use examples:
- my name when single was Miss Janet Carr
- my name when married was Mrs Mark Comerford
- my name when divorced was Mrs Janet Comerford
- my name if widowed would be Mrs Janet Comerford
but to avoid all trickiness with titles for women, just use Ms (pronounced Mz)