Use question marks to close sentences that ask direct questions.
How is the human mind like a computer, and how is it different?
– Kathleen Stassen Berger and Ross A. Thompson,
The Developing Person through Childhood and Adolescence
Question marks do not close indirect questions, which report rather than ask questions.
She asked whether I opposed his nomination.
Do not use a comma or a period immediately after a question mark that ends a direct quotation.
Questions in a series may have question marks even when they are not separate sentences.
I often confront a difficult choice: should I go to practice? finish my homework? spend time with my friends?
A question mark in parentheses indicates that a writer is unsure of a date, a figure, or a word.
Quintilian died in ad 96 (?).