1
BAD : Our English teacher is called Mr John.
GOOD : Our English teacher is called Mr (John) Smith.
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Mr/Mrs/Miss/Ms (+ first name) + surname: 'Mrs Waters', 'Mr Clive Upton'
2
BAD : Dear Mr,
GOOD : Dear Sir,
BAD : Dear Mr/Mrs,
GOOD : Dear Sir/Madam,
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When you are writing a formal letter and you know the surname of the addressee, begin Dear Mr Smith, Dear Mrs Jones, Dear Ms Simpson etc. When you do not know the person's surname, begin Dear Sir, Dear Madam or Dear Sir/Madam .
3
BAD : Dear Mr Alan Jones,
GOOD : Dear Mr Jones,
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Dear is followed by Mr/Mrs/Ms + surname only (NOT first name + surname): 'Dear Mrs Jackson'