My son got this question wrong on his test and I have always been under the impression that an exclamatory sentence has an exclamation mark. Can someone please clarify? Boy, I bet you're tired after that walk.

The sentence is from a paragraph (Murder of Roger Ackroyd) as below; “Did Poirot ask you any more questions?” I inquired. “Only about the patients you had that morning.” “The patients?” I demanded, unbelievingly. “Yes, your surgery patients. How many and who they were?” “Do you mean to say you we...

This novel was used as part of a UK secondary school lesson (or several lessons?) in the early 90s. We might have read the whole thing, or just some excerpts. I think it was before English literature came under the National Curriculum, so it could have been simply a favourite of that school or te...