I still have problems with these type of things.

I think I understand well that between "I know where the house is" and "I know where is the house" the correct sentence is the first one (I hope so). But in the title's case I'm not sure at all.

  • It's the same principle in both cases. Did you see something that implied that it was different between "who" and "where"? – stangdon Aug 22 '16 at 22:57
  • Related: who is this VS. who this is – user3169 Aug 22 '16 at 23:02
  • How about some punctuation at the end of your sentences? – user3169 Aug 22 '16 at 23:03


I don't know who Sophie is.

you are saying that you are not familiar with Sophie.

I don't know who is Sophie?

Sounds awkward to a native ear, but is understandable. Better might be

I don't know. Who is Sophie?

In which you are asking the question seeking information about Sophie.

Generally, the question will imply that you are not familiar with Sophie and has the same implicit meaning as your other sentence, but the question is seeking information about Sophie where as the other sentence is only saying you do not know Sophie.

P1: Is Sophie the new student?
P2: I don't know. Who is Sophie?

  • Is it okay to say "I don't know who is Tweedledum and who is Tweedledee" to mean "I can't tell one from the other" or "I can't distinguish between them"? Or should I use "which" rather than "who"? – Chocolate Aug 23 '16 at 1:58
  • Either will work, "who" is fine because they are people, "which" is fine because it is a choice. – Peter Aug 23 '16 at 2:00

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