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This question already has an answer here:

  1. I don't know which group I belong to.
  2. I don't know to which group I belong.

Which one of the sentences is true?


Note: An answer was given to this question when it still read "I don't know (to) which group do I belong (to)."

marked as duplicate by tchrist Nov 7 '18 at 19:53

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    Either one could be true; I don't know which group you belong to. But I think you're asking about grammaticality. The first one has what is called a stranded preposition at the end, and the second one has what is called a pied-piped preposition at the beginning. Both are correct, both are grammatical, and both mean the same thing. You get to choose which one sounds nicer to you. – John Lawler Nov 7 '18 at 19:32
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Both are worded in the form of a question without the correct puctuation.

While the more formal old school "To which group do I belong" is a good way to form the sentence if it is truly a question, but the informal "Which group do I belong to" is much more common, though some might argue is not technically good form. In short, my suggestion is that you are using too many words, but I will also correct the above examples.

  1. I don't know which group I belong to.
  2. I don't know to which group I belong.

I simply removed the word 'do', from both.

  • 1
    +1 Mainly because the question was edited after your answer, thereby invalidating part of your answer (and having it partially make no sense). – Jason Bassford Nov 7 '18 at 20:43
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In a comment, John Lawler wrote:

Either one could be true; I don't know which group you belong to. But I think you're asking about grammaticality. The first one has what is called a stranded preposition at the end, and the second one has what is called a pied-piped preposition at the beginning. Both are correct, both are grammatical, and both mean the same thing. You get to choose which one sounds nicer to you.

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