I wonder why?
On page 89 of “Eats, Shoots & Leaves”, Lynne Truss writes, “I wonder why?” Many people put a question mark at the end of this phrase, but to me it doesn’t seem like a question. Isn’t it a statement? “I wonder” is a statement. “Why” is a question in and of itself. In this context, though, the question mark is not making sense to me.