a (an)
used before someone's name when you do not know who they are:
There is a Mr Tom Wilkins on the phone.

Student or Learner
hi guys,
What's the difference between saying a Mr. Smith and Mr.Smith?
Can a receptionist at hospital come and ask a patient: a Mr. Smith?
Does it mean that she hasnt met him before?
What is a difference between saying: "Ask a teacher" and "Ask the teacher"?
Thanks in advance
a (an)
used before someone's name when you do not know who they are:
There is a Mr Tom Wilkins on the phone.
But if the receptionist in a hospital or clinic is unsure that there is a patient with that name, she / he can go into the waiting room and ask "Is there a Mr Smith here?"
As to the teacher, "a teacher" means any teacher; "the teacher" is a specific teacher, maybe the one taking a particular class.
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