I have a question regarding the place of the possessive determiner, "his," I should put in a sentence.
a) another email address of his (I know that there is a saying of "a friend of mine", but I don't know if it is good to say "another email address of his")
b) another his email address
c) his another email address
Which one(s) is/are grammatically acceptable?
If I am going to put it in a sentence beginning with "I do not know...," which one(s) is/are more suitable?
Could, "... his another email address" absolutely never be used?
I am thinking of a situation when "he" used to have a number of email addresses (with which perhaps we were familiar), but suddenly one day he used a new one. Could we not then say, "We do not know his another email address" meaning, "We know that he has a new email address (beside those which we know already), but we do not know what it is"