No doubt, the question mark is a nice little piece of punctuation. And, best of all, it’s easy to use!

What Is a Question Mark For?

The main purpose of a question mark, perhaps unsurprisingly, is to indicate that a sentence is a question. Direct questions often (but not always) begin with a wh-word (who, what, when, where, why).

But, not all questions are phrased as questions. Sometimes we phrase questions the same way we would phrase a declarative sentence. In the speech, the way your voice rises at the end of the sentence usually makes it clear that you’re asking a question and not just making a statement. But in writing, you need a question mark to signal to readers that they should read the sentence as a question.

Phrasing a question as an imperative or declarative statement is an emphatic way to express surprise, doubt, or disbelief.

Question Marks and Quotation Marks

When your sentence is a straightforward question, the question mark goes at the very end and serves as the terminal punctuation mark. But things can get tricky when you have other punctuation nearby.

At first glance, the rules about question marks and quotation marks can seem complicated. But the logic is fairly simple. Keep the question mark inside the quotation marks if it logically applies to what is enclosed by the quotation marks. You’ll often see this in written dialogue:

If the question mark applies to the sentence as a whole instead of to the phrase inside the quotation marks, put it at the very end:

This holds true even when you have a quotation containing a question:

And for a quoted question containing a quoted statement:

When you have a question mark that applies to both the quoted phrase and the rest of the sentence, just use one question mark:

Question Marks and Parentheses

The rules for question marks and parentheses are similar to the rules for question marks and quotation marks. If a question mark applies to the parenthetical information, place the question mark inside the parentheses:

When the question applies to the whole sentence, put it outside the parentheses:

Indirect Questions

There is one type of question that never takes a question mark: the indirect question. Indirect questions are embedded within declarative statements:

Sometimes, with one-word questions, it’s hard to decide whether it’s a direct or indirect question. In most cases, it’s fine to treat it as an indirect question:

When a Question Mark Isn’t Enough

As useful as the question mark is, sometimes it’s tempting to embellish the end of your sentence with extra punctuation, especially when you’re trying to convey something really surprising and exciting.

If you don’t recognize the symbol at the end of the last sentence, it’s called an interrobang, and it’s a combination of a question mark and an exclamation point. Interrobangs, multiple question marks, and combinations of question marks and exclamation points might be fine for casual writing, but in formal writing, it’s best to limit yourself to just a plain old question mark. Sometimes, you can make the choice easy with just a little rewriting: