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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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