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The Mayfield Handbook of Technical & Scientific Writing
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Section 8.5

Question Marks

Use a question mark to end an interrogative sentence.


Have past efforts to develop an AIDS vaccine been based on the wrong approach?


Use a question mark to change a declarative or imperative sentence into a question.


Their testing of the system was exhaustive? [declarative changed to interrogative]

Start production on Friday? [imperative changed to interrogative]


When a directive or a command is phrased as a question, a question mark is optional.


Will you please send me a progress report by June 10?

Will you speak to the vendor about the networking problems.


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 the network's backbone would significantly increase performance.


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