Question marks (?)

Use a question mark for a direct question.

Examples
Who wrote the book of love?
Would you like to try it?

Don’t use a question mark for indirect questions.

Examples
I wonder who wrote the book of love.
She didn’t answer him; he wondered why.

Many rhetorical questions (those asked for effect and not requiring any answer) do require a question mark. But use an exclamation point instead when the question is really an exclamation, and use a period when the question is really a suggestion or a polite request (one where a “no” answer is not anticipated).

Examples
Rhetorical questions with question marks
Can you believe it? I just bought that car, and it’s already scratched.
What kind of a man are you?

Exclamations, requests, and suggestions formed as questions
Boy, do I!
How can you possibly think that!
Would everyone please rise for the national anthem.
Why don’t you stop asking me questions already.
Why don’t you take a long walk off a short pier.

When an attribution (such as he said, I wondered, or they asked) ends a sentence, put the question mark at the end of the question, not at the end of the sentence.

Examples
Before
Who wrote the book of love, I wondered?
After
Who wrote the book of love? I wondered.

Before
“Do you know the way to San Jose,” asked Judith?
After
“Do you know the way to San Jose?” asked Judith.