Proper Uses of the Question Mark [?]

1. Use the question mark at the end of a sentence asking a question.

A question can be signaled by a wh- word: What are you doing?
A question can be signaled by an inverted word order: Is that you?
A question can be signaled by a rising intonaton: Harry won the lottery?

2. Use the question mark after groups of words used as questions.

So what?
By the bridge?

3. Use a question mark to indicate doubt about something.

He was born in B.C. 723(?)

4. Put question marks inside quoted questions and outside if the quoted part is a part of a non-question clause.

"Where is it?"
Who said "I'm in"?

5. Use only one question mark for a quoted question.

Did she say, "Where is Mark?"

6. If the quoted question is followed by another sentence, don't use any other punctuation.

Christ said, "Oh, yea of little faith!" This marveled them.