Use a question mark to end an interrogativesentence.
Have past efforts to develop an AIDS vaccine been based onthe wrong approach?
Use a question mark to change a declarative orimperative sentence into a question.
Their testing of the system wasexhaustive?[declarative changed tointerrogative]
Start production on Friday? [imperative changed to interrogative]
When a directive or a command is phrased as a question, aquestion mark is optional.
Will you please send me a progress report by June10?
Will you speak to the vendor about the networkingproblems.
Use a question mark to indicate uncertainty about data.
The first synthesis was accomplished by Claude Poux(1810?-1897).
Do not use a question mark at the end of an indirect question.
James asked whether increasing the bandwidth of thenetwork's backbone would significantly increaseperformance.
The McGraw-Hill Companies, Inc..