In terms of curriculum development, this topic is an endless one. Arguably, descriptive grammar is constantly challenging prescriptive grammar to become more user-friendly. Stiff and formal rules of grammar are slowly being nudged into the dust heap of language history by new, perhaps more logical, forms. This is a good thing.
The obvious question a discussion on this topic poses is: "Whose grammar?"
Descriptive and prescriptive grammars vary in most languages, but perhaps more so when it comes to English. North American and British grammars may be nearly identical when it comes to the text books, but vary to some degree on the descriptive front:
1) Have you got? vs. Do you have?
2) Shall we go? vs. Would you like to leave?
These examples may not be the best, but you can see the point.
If we vote for descriptive grammar (and I hope most people do) we need to give a wide berth to the forms earmarked as "correct" or acceptable. Perhaps the consequence would be a more colorful and interesting English for the future.
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