Grammar: The Question Mark [ ? ]

 

Question marks (or interrogation marks) are used with direct questions 

      Where are you going?     

      Who said that?

      What time is it?

rhetorical questions (questions construed as affirmations and requiring no answer) 

      What could be nicer than to be out strolling on a fine spring morning?

      Who says it can’t be done?

      Can there be anything worse than betraying a friend?

statements construed as questions –

      Youve actually won the lottery?

and dates to indicate a lack of verification –

      Another influential composer of the period was Carlo Gesualdo (?1560?1613).

Question marks are not used with indirect (reported) questions –

      I asked him where he was going

      She asked what time it was

or questions in business correspondence that are contextually requests or expressions of gratitude or goodwill –

      Will you please confirm the date of your arrival

      May I wish you well for the future.

As explained in quotation marks, when a quoted direct question ends a sentence that is itself a direct question, we may use either one or two
question marks, with two being grammatically more correct 

      ‘Was it Cain or Abel who asked, Am I my brother's keeper?? (Correct)

      Was it Cain or Abel who asked, Am I my brother's keeper?”’ (British publishing practice)

Apart from the above, the use of multiple question marks is never justified –

      He said what???