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
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
Will you speak to the vendor about the networking
Use a question mark to indicate uncertainty about data.
The first synthesis was accomplished by Claude Poux
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