...and perhaps answering William's original question. However, I wouldn't necessarily recommend teaching this in the ESL/EFL classroom. If a student comes to me with a question like William's, I probably would start with, "Well, technically there's a difference, but for all practical purposes they mean just about the same", and see if that satisfied them. I know William, from his previous postings, to be a teacher, and so in this thread, I tried to get him to work it out for himself, and for all I know, he did.Can you enlighten us a bit, Larry? I'm afraid a lot of the type of nuances you seem to able to detect/see/hear pass right by my brain/eyes/ears (I've just not read Lewis as closely as you have, I guess ). Then I'll be able to disagree with you without needing to do any homework of my own.
As for the homework doing itself...well, I tried that a hundred times with my sons when they were young. Never seemed to do much good, of course. Their homework often did not do itself.

And finally, as regards temporal or qualitative concepts, I wasn't referring to any pair of sentences. I was referring to interpretations of the word, "finished."
Please note that nowhere here was I making a pedagogical argument. I thought I was having a conversation with some teachers.

Larry Latham