Given the task definition and input, reply with output. Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.

Question: How can I explain to people that the phrase off of is grammatically incorrect? I've heard this phrase used a lot, especially by Americans (though they aren't the only ones). In my understanding, off of should usually be replaced by off, as in, I took the book off the shelf as opposed to I took the book off of the shelf Am I wrong? Or is there perhaps some simple way I can explain this to most people?
Answer: How can I explain to people that the phrase "off of" is grammatically incorrect? You can't, because it's not. There are thousands of examples of "off of" in the Corpus of Contemporary American English, not just in spoken English, but in magazines, newspapers, and academic journals as well. "Off of" is well-established as standard in American English. Plain "off" may be stylistically preferable in many cases, but it is simply not a rule of English grammar that if a word could be removed it must be removed. Some people seem to think that such a rule exists. It does not.
yes