Indefinite Article 'a' can be Placed before Mr/Mrs/Miss

The indefinite article, a, can be placed before Mr/Mrs/Miss + surname

For examples:

• a Mr Smith
• a Mrs Smith
• a Miss Rihana

'a Mr Smith' means 'a man called Smith' and implies that he is a stranger to the speaker.

'Mr Smith', without a, implies that the speaker knows Mr Smith or knows of his existence.