Intermediate English Grammar for ESL Learners - Robin Torres-Gouzerh 2016

The question mark
23 Punctuation

A question mark is used at the end of a sentence to signal a question; it can be a direct question, an interrogative series, or an expression of editorial doubt.

When are you coming?

Peter waved his hands while jumping up and down. What if they failed to see him?

What do you think of his paintings? sculptures? drawings?

Despite his participation in the 1934 riots (?), we do not know which organization he was marching with.