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If I am unsure if a woman is a Miss or Mrs., do I correctly address her (in writing) as Ms.?
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Yes.
In fact, the Miss or Mrs. may prefer to be addressed as Ms.
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
if the addressee in question has signed with both her christian and surnames should she be addressed as Ms Smith or Ms Mary Smith?
Ms. Smith.