I was chatting with my friend and I had a doubt: Which is right between "In what language do you think?" and "What language do you think in?". I've a doubt on how to use preposition (at, in, on etc.) in question.

  • This is a controversial topic :) See -en.wikipedia.org/wiki/Preposition_stranding#In_English The first is more formal, but the second is what I'd expect to hear in conversation. – user812786 Aug 17 '16 at 12:11
  • What you mean with "controversial topic"? Is it too broad? – Mattew Aug 17 '16 at 12:12
  • Just that there are a lot of opinions. Some people think it is bad grammar to have dangling prepositions, but others think either way is equally valid. – user812786 Aug 17 '16 at 12:13
  • Oh ok :( I'm sorry, Do I have to close the question? – Mattew Aug 17 '16 at 12:15
  • I think it's a valid question! It is about a specific thing, so not "too broad". The answer just might be "either is ok". (I'll think about it but I don't have time to write an entire answer right now, so maybe someone else will first) – user812786 Aug 17 '16 at 12:17

Both of your example questions are correct, both can be used in conversation.

In what language do you think?

is more polite and formal and can also be asked as "In which language do you think?"

What language do you think in?

is more informal.

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